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matt-ridley-the-red-queen-sex-the-evolution-of-human-nature-1993-1-638 In the late 2000s there was a lot of talk about how the Tasmanian devil was going to go extinct because of devil facial tumor disease. I expressed the thought that we need to be really cautious thinking that disease could drive the devils to extinction. This was not based on detailed knowledge of the biology of the devils. It was based on the fact that complex organisms are often subject to disease, and populations do crash, but it is clear that even if census size gets rather small, unless a population is very small and restricted disease itself and alone probably won’t eliminate an organism because there will be an evolutionary response. That’s one of the main arguments for why complex organisms tend to be predominantly sexual lineages despite the process’ two-fold cost. From what I recall many of the researchers expressing alarmist sentiments were ecologists, who often do not have evolutionary responses foremost in their mind.

But, there are reasons to be worried. The devil went extinct on the mainland ~3,000 years ago. The reason was probably the same as with the Tasmanian tiger: competition with the introduced dingo dogs. Probably more dangerous to the long term viability of the devil is that it is now restricted to an island the size of the Republic of Ireland (and much of the habitat on Tasmania is not devil optimal), where it is subject to habitat loss, and competition with introduced species.

Mind you, I am somewhat worried about the possible loss of the devil. But I thought it was frankly somewhat sensationalistic to assume that the devil’s disease was sui generis, and we just happened to be living at the time when the whole species was going to go down after persisting in Tasmania for ten thousand years despite various ups and downs. Diseases come and go. What is sui generis is the terraforming inclinations of our own species. We are the necessary and often sufficient condition.

A new open access paper suggests I may have been on the right path, Rapid evolutionary response to a transmissible cancer in Tasmanian devils:

Although cancer rarely acts as an infectious disease, a recently emerged transmissible cancer in Tasmanian devils (Sarcophilus harrisii) is virtually 100% fatal. Devil facial tumour disease (DFTD) has swept across nearly the entire species’ range, resulting in localized declines exceeding 90% and an overall species decline of more than 80% in less than 20 years. Despite epidemiological models that predict extinction, populations in long-diseased sites persist. Here we report rare genomic evidence of a rapid, parallel evolutionary response to strong selection imposed by a wildlife disease. We identify two genomic regions that contain genes related to immune function or cancer risk in humans that exhibit concordant signatures of selection across three populations. DFTD spreads between hosts by suppressing and evading the immune system, and our results suggest that hosts are evolving immune-modulated resistance that could aid in species persistence in the face of this devastating disease.

Again, we need to be cautious about these results. They’re preliminary. Just as we needed to be cautious about the original extreme claims.

 
• Category: Science • Tags: Tasmanian devil

Screenshot 2016-08-30 07.49.59

Year Google Scholar hits
2000 64
2005 271
2010 1670
2011 2210
2012 3200
2013 4020
2014 4380
2015 4820
 
• Category: Science • Tags: Epigenomics

gal The above talk is from Alice Dreger, author of Galileo’s Middle Finger: Heretics, Activists, and One Scholar’s Search for Justice. I don’t know Dreger personally, but she seems like a brave and courageous person. In the broadest strokes there’s very little where we disagree. Yes, our politics, and many of our specific beliefs, diverge, but we generally at least hold to the ideal of truth.

There is one section of her talk where Dreger waxes eloquently about the Enlightenment, and freedom of thought, which caught my attention. We have always missed the mark, but at there was a point where in Western intellectual culture the idea that freedom of thought and striving toward truth was at least the paramount method and goal. I am not so sure that is the case today.

When Dreger pointed approvingly on Twitter to University of Chicago’s statement on “safe spaces,” I told her that most of my liberal Twitter follows were enthusiastically sharing this piece, UChicago’s anti-safe spaces letter isn’t about academic freedom. It’s about power. The piece makes some coherent points, but mostly it is self-congratulatory intellectual masturbation. At a certain point the cultural Left no longer made any pretense to being liberal, and transformed themselves into “progressives.” They have taken Marcuse’s thesis in Repressive Tolerance to heart.

75812 Though I hope that Dreger and her fellow travelers succeed in rolling back the clock, I suspect that the battle here is lost. She points out, correctly, that the total politicization of academia will destroy its existence as a producer of truth in any independent and objective manner. More concretely, she suggests it is likely that conservatives will simply start to defund and direct higher education even more stridently than they do now, because they will correctly see higher education as purely a tool toward the politics of their antagonists. I happen to be a conservative, and one who is pessimistic about the persistence of a public liberal space for ideas that offend. If progressives give up on liberalism of ideas, and it seems that many are (the most famous defenders of the old ideals are people from earlier generations, such as Nadine Strossen and Wendy Kaminer, with Dreger being a young example), I can’t see those of us in the broadly libertarian wing of conservatism making the last stand alone.

Honestly, I don’t want any of my children learning “liberal arts” from the high priests of the post-colonial cult. In the near future the last resistance on the Left to the ascendency of identity politics will probably be extinguished, as the old guard retires and dies naturally. The battle will be lost. Conservatives who value learning, and intellectual discourse, need to regroup. Currently there is a populist moood in conservatism that has been cresting for a generation. But the wave of identity politics is likely to swallow the campus Left with its intellectual nihilism. Instead of expanding outward it is almost certain that academia will start cannibalizing itself in internecine conflict when all the old enemies have been vanquished.

Let the private universities, such as Oberlin, wallow in their identity politics contradictions. Dreger already points to the path we will probably have to take: gut the public universities even more than we have. Leave STEM and some professional schools intact, and transform them for all practical purposes into technical universities. All the other disciplines? Some private universities, the playgrounds of the rich and successful, will continue to be traditionalist in maintaining “liberal arts,” which properly parrot the latest post-colonial cant. But much learning will be privatized, and knowledge will spread through segregated “safe spaces.” Those of us who read and think will continue to read and think, like we always have. We just won’t have institutional backing, because there’s not going to be a societal consensus for such support.

I hope I’m wrong.

 
• Category: Ideology • Tags: Intellectuals

Since there was some discussion about East Asian genetic structure below…I pulled about 20 South Koreans I have in my data. Merged them Han and Japanese from the HGDP. I then ran a PCA and plotted it, and also unsupervised ADMIXTURE, and plotted it.

The results are below.

Rplot42

Screenshot 2016-08-29 03.09.33

 
• Category: Science • Tags: Koreans

Screenshot 2016-08-28 15.41.08
About thirteen years ago I expressed the opinion that an understanding of population structure will become a matter of intellectual curiosity once we have a better understanding of the genetic basis of characteristics. A friend, who was a statistical geneticist, told me that this was unlikely. We were unlikely to capture the ability to predict all outcomes well enough on even high heritable complex traits to simply discard population structure information. Some of this is not due to genetics; different populations may expose themselves to different environmental conditions. For example, it would be useful to know which individuals in the CEU white European American data set are practicing Mormons, and which are not, because Mormonism tends to result in a lot of behavior modification.

But some of the concern about population structure has to do with the fact that genetic background matters, and we are unlikely to ever have total omniscience as to the nature of genetic interactions and dependencies. By this, I mean that if we have a strong causal signal which associates disease risk with a genetic variant, that risk is still conditional on dependencies of other genetic variations across the genome. Those variations are the outcome of demographic histories, which one can “control” for to some extent by accounting for population structure. In more plain language, a signal that predicts an outcome in Norwegians may not predict the same outcome in Nigerians. The may be due to different frequencies of other variants which are not directly causal, but interact with the causal signals, which vary between populations.

Screenshot 2016-08-28 15.58.43 More recently I’ve been a bit sanguine. I don’t follow the literature closely, but papers like High Trans-ethnic Replicability of GWAS Results Implies Common Causal Variants, make me wonder if the genetic background concerns weren’t over-wrought.

A new preprint, Population genetic history and polygenic risk biases in 1000 Genomes populations, suggests we should be worried. Or, more precisely, we should be cognizant of the limitations genetic background imposes upon us for certain classes of variants and disease. In particular, rare variants are going to be less portable across populations because of shallower time depth of their emergence, after, populations have diverged. So, if you have a low frequency major effect causal variant in Europeans, there is a much lower likelihood that it is in other populations.

The histogram above illustrates an excellent case study from the preprint. The genetic architecture of height and its genomic basis has been most well elucidated for Europeans. We know, for example, many of the loci which distinguish Northern and Southern Europeans, and, we know that selection has resulted in divergence between the two populations over the past 5,000 years. But as you can see the predicted heights seem to simply follow genetic distance from Europeans. SAS = South Asians, while AMR = a mixed cohort of populations from the Americas. EAS and AFR are East Asians and Africans. In reality, Africans are nearly as tall as Europeans (taller or shorter depending upon the reference European population), and taller than East Asians. The predictions here are off because the causal variants inferred from the studies of European cohorts are portable in direction proportion to shared demographic history. South Asians share a relatively ancient demographic history with Europeans, while many mixed groups from the Americas have Europeans as one of their recent founding populations. But in both cases the causal variants were likely segregating in the ancestral populations before divergence, so there is no major difference in the consequence.

The preprint has a lot more than just a reanalysis of GWAS. Using local ancestry deconvolution methods they show how one can infer history from patterns of genetic variation (though as always, this should not be taken as gospel, as there are biases in the methods currently used). The major take home is simple: population structure is real, and, it has real consequences functionally.

 
• Category: Race/Ethnicity, Science • Tags: Genetics, Genomics

21_SM_indian_ocean_2979858e About 2/3 of the way through The Ocean of Churn: How the Indian Ocean Shaped Human History by Sanjeev Sanyal. It’s a wide-ranging book which synthesizes diverse disciplinary threads. The big over-arching thesis seems to be that movement of peoples and ideas was far less unidirectional than we often tend to think and are told. Probably one of the major examples of this which I think has been somewhat misleading to many people has been the idea that migration out of Africa can be purely defined unidirectional migration in a series of stepwise events.

Human_migration_out_of_AfricaThat being said, there are the usual problems that occur when you synthesize diverse disciplines. Since I know a fair amount about the intersection of genetics and history I can say with great confidence that some of the genetics in the book is now outdated. The reason is that it relies on work that was published ~5 years ago. Also, there is the unfortunate reality that sometimes high-impact journals publish works that are almost certainly wrong. For example, Sanyal cites Genome-wide data substantiate Holocene gene flow from India to Australia. This paper is interesting, but it was clear to many that it was probably wrong almost immediately upon publication.

Longer review when I have time.

I need to read the paper closely. But the demographic-historical implications of this are pretty straightforward. (it’s open access)

G.E., the 124-Year-Old Software Start-Up. The story is interesting to me mostly because it illustrates how contingent how modern civilization is. There are so many people doing so many specialized things that we take for granted.

518EQMWHB0LForget “Earth-Like”—We’ll First Find Aliens on Eyeball Planets. M. J. Engh’s Wheel of Winds was set on one of these planets.

Ohana:

Ohana is a suite of software for analyzing population structure and admixture history using unsupervised learning methods. We construct statistical models to infer individual clustering from which we identify outliers for selection analyses.

It may be better than ADMIXTURE, but we’re reaching a point where “good-enough” tools are achieving “lock-in.”

Empirical assessment of published effect sizes and power in the recent cognitive neuroscience and psychology literature. No surprise.

Down in the valley, up on the ridge. On Melungeons.

Leon Hadar is now a contributor to Secular Right, Will Trump Usher the GOP’s Secular Age?

The crescent and the globe. I wrote this.

 
• Category: Miscellaneous • Tags: Open Thread

 
• Category: Humor

Screenshot 2016-08-26 19.23.09

Update: In light of further comments I may have been wrong about Hong’s recent admixture! See the comments below (also, further discussion with Spencer Wells offline). I don’t have total clarity on what’s going on, because I’m sure my friends weren’t lying…but they were also early adopters, and the methods may have changed. And, I do think 23andMe has the talent and methods to resolve Korean ancestry, so it’s a matter of investment, not data.

All that being said, all individuals should pull down the raw data and do a reanalaysis.

End update

Quartz has an article up, 23andMe has a problem when it comes to ancestry reports for people of color, which I want to comment on at length. Though literally taken the title is not something I’d disagree with too much, the tone and details I have serious issues with.

First, some disclosure. Hong talked to me on the phone for an hour about this story. Mostly we talked about her Korean ancestry results. More on that later. Second, I consulted for 2.5 years for Family Tree DNA, am friends with Spencer Wells (who is quoted), and am on friendly terms (I’d like to think!) with Joanna Mountain, and quite respect many of the scientists at 23andMe (e.g., Kaisa Bryc and Ivan Juric off the top of my head).

I will go through the article point by point. First:

I doubt that most 23andMe users realize how paltry the company’s data is for non-Caucasians. For example: The data set that 23andMe used to generate my report has 76 Koreans in it, according to Dr. Joanna Mountain, the company’s senior director of research. 76 Koreans. It is estimated there are at least 7 million Koreans living outside of the Korean peninsula—including 1.7 million in the US—among a worldwide population of 83 million.

Seventy-six Koreans seemed small to me, but what do I know? I’m just a journalist. So I spoke to geneticist Spencer Wells, founder and former director of National Geographic’s Genographic Project (arguably a 23andMe competitor), which he ran from 2005-2015. “[76] is a really low number,” he concurred.

The small sample sizes seem really, really problematic if you are a lay person, or a journalist. The issue is that with genotype technology that looks for common polymorphisms you really don’t get that much more information from 1,000 individuals than you do from 100. All things equal, more sample size is better, but the gap between 10 and 100 is much much greater than 100 and 1,000 or 100 and 10,000. You can see this in the robustness of results for model-based clustering conditional on different sample sizes. For a homogeneous population like the peoples of the Korean peninsula, who seem relatively panmictic, a bigger sample size would have only marginal effect on the overall outcomes using these methods (also, it might matter if you were looking at low-frequency alleles from whole genome sequencing).

Before I talked to Hong I checked in with a friend who was half north Korean (in that her father’s family was from the northern half of the peninsula and migrated south) and half central Korean (i.e., her mother’s family was from around Seoul). Just like her husband, whose family was from Busan in the far south, her results came back as 99% Korean. Some genetic research has been done on Koreans, and there just isn’t that much structure. The Koreans have a composite origin if you go far back enough, but they’ve been intermarrying with each other a long time.

Next:

Also, astonishingly, the report shows that I am 13.4% Japanese and 14% Chinese—and only 61.6% Korean. I was looking forward to watching my parents freak out. My sister texted me, “Oh [Dad will] probably blame Mom.”

To my disappointment, my parents did not freak out, nor did they get into an amusing argument about which of their ancestors was the ho. Because they simply did not believe the data. And, for once, they were right.

The public relies on journalists for the truth. Sometimes the truth can be slippery. But sometimes it is clear. Most of conversation between Hong and myself was about her Korean ancestry. As I said to her, I asked a handful of my Korean friends about their 23andMe results before we spoke. From that I told Hong I was 99% sure that she had recent non-Korean ancestry. 23andMe’s results are really robust. I tried to emphasize that over and over. Hong can believe what she wants, but it is obvious that she almost certainly has non-Korean ancestry relatively recently in the past.

Because 23andMe uses chromosome painting, you can see she has very long segments of inferred Chinese and Japanese ancestry. This non-Korean ancestry is probably from within the last three generations because ancestry tract lengths indicate that recombination hasn’t broken apart the associations across the chromosomes (there are 20-40 recombination events across the genome per generation).

Next:

I asked Wells whether my percentage breakdowns of Korean, Chinese, and Japanese meant anything. “Yes,” he said, “but I think it is misleading to go to a decimal place or even to go out two digits.” Wells said that another problem with the data is that “Most of those [samples] are from the US. They’re not terribly useful for studies of indigenous composition—which is effectively what this analysis is trying to do.”

I had a long text conversation with Spencer on this after the article came out. I can see where he’s coming from. And 23andMe does have a shortfall of indigenous and non-European samples. But as I said, I asked around to Korean friends who had used 23andMe before and the population is pretty homogeneous, and the friends’ results I cited above were representative. I have also worked with and seen samples from Family Tree DNA, and it’s the same story. There might be undersampled populations from Korea, but I’d bet against it. Koreans are relatively homogeneous, with a position between Japanese and North Chinese. Where you would expect them to be.

Spencer is correct about the decimal places issue. They give people a false impression of precision. I do know that scientists within DTC companies struggle against it. But scientists don’t always win these arguments.

Next:

I also interviewed Harvard geneticist Robert Green, who made the important point that private companies have different methods and standards from those of an academic lab. “There is a difference between analysis you can do with hundreds of [genetic] markers at a research level, and the kind of analysis that even the best companies can do, which is more an approximation,” he said.

Green is a medical geneticist who does great work. But I’ll be generous and assume he’s taken totally out of context here, because what he says makes no sense. The genotyping platforms do have error rates (no-calls, mistypings, etc.) on the order of 1%. But they’re using hundreds of thousands of SNPs. This error rate doesn’t matter too much for what 23andMe is doing in relation to ancestry. And with population structure inference these errors usually don’t cause a major issue if they aren’t systematic.

Then there’s this:

A few of the geneticists I interviewed for this article (but not Green or Wells) outright accused 23andMe of commercially driven ethnic bias. For example, no distinction is made between northern and southern Chinese, who have very different traits. This was a serious allegation, so I put the question directly before 23andMe’s Mountain. “As a scientist, I find that insulting,” she said in a phone interview.

I brought up the issue with the Chinese to Hong, and I apologize to Mountain here if it came off as offensive, because I certainly didn’t mean it that way. My point, which I’ve brought up for years both in public, and when I have consulted for DTC companies, is that South and East Asians are huge groups, and it’s incongruous that they aren’t differentiated as much as the Europeans. These tests basically tell you are South Asian, or Chinese, or Korean, or Japanese. In the case of Koreans and Japanese there isn’t that much structure within these groups, but that is not the case with the Han Chinese. There is an decent amount of structure, but last I checked 23andMe has a catchall Han Chinese group. Why? I’ll get to that later. (It’s not because they don’t have the data.)

Though I disagree with the tone and the emphasis, a simple inspection by Hong has shed light on something that has been glaringly obvious in the genetic genealogy community: there is laser-like focus on differentiating very close Northern European groups, such as Irish and English, and not so much emphasis on differentiating diverse populations such as South Asians. This was one thing I did talk to Hong about at length. I don’t think it’s crass racism, and I think that I made that clear to her, but I’m not happy with the situation either (23andMe representatives know I’m not happy, and have talked to me about it at ASHG).

The final sections involve Hong reviewing the disparities in sample representation. As I said above, some of this overdone. But, it is a little ridiculous that there are only a few hundred African population samples in their data. Granted, it turns out that between-population genetic distance in Africa is actually not as much as you’d think based on aggregate variation (the within population variation is what makes all the news). I think Hong is correct that 23andMe should have made more effort on sample collection these past few years…but I’m not CEO of 23andMe, and Joanna Mountain and her scientists don’t call all the shots. I think Hong’s piece leaves Mountain and the researchers holding the bag for something that really isn’t their doing (perhaps it is, but I’m really skeptical of that).

Finally:

Could the company be doing a better job with collecting ethnographic data? “Absolutely they could,” Wells said, “but it’s not their raison d’être.” Which, of course, is pharma and health research. Fair enough—it’s their money. But how about a disclaimer attached to the ancestry part of the report? Like, “for entertainment purposes only?” Because data based on 76 Koreans (or any other ethnic group) is definitely not worth potentially causing family discord or a blood feud. I don’t know whether the company understands the realities of deadly global ethnic tensions and the potential damage created by people’s trust in these reports.

I think Spencer has highlighted the major dynamic here: 23andMe is pivoting towards biomedical research. It has a database of north of a million, mostly European-origin individuals. The real money now comes from leveraging the database to collect information on health, and combining it with the genotypes they already have. On the margin, getting greater population diversity is probably not a major avenue by which they could gain higher valuations. And getting from one million to ten million genotypes is nothing without increasing their database of phenotypes.

The real story here is not one of racism. It’s one of capitalism. Most of 23andMe’s customers are white European in ancestry, and a disproportionate number of those are Northern European. Is it a surprise that their tools breakdown Northern European ancestry so finely? That’s their customer base.

Second, many Asians I’ve talked to are relatively uninterested in fine-grained breakdowns in their ancestry. For several years I worked with an engineer from Fujian, and his Family Tree DNA results showed that he was shifted toward the southern end of the north-south Chinese cline. He didn’t care at all, because he was from Fujian, so of course he knew this. Many Asians seem to have this attitude where the ancestry results are viewed as confirmatory. Hong’s case, where there was a surprise, is exceptional.

If 23andMe wanted to they could easily breakdown Asians into further subcomponents. I think there are two reasons they don’t want to aside from the firm’s recent focus on health and pharma. First, they don’t have that many Asian customers. Second, their Asian customers might actually get a bit irritated!

Ultimately, Hong can think whatever she wants to about her 23andMe results. But the data are out there. It’s pretty obvious that unless there was a sample mix-up, she has recent Chinese and Japanese ancestry (she could put the raw results in the public domain and have people cross-check with other methods, like PCA; I’m pretty sure they would confirm the 23andMe results).

On a last nerdy note: the data generated by DTC companies is great. Their Illumina SNP-chips are really good, with 99% or so correct-call rates. Hong referred to data in the piece when she really meant results. The thing is that results are basically generated through a sieve of methods geared toward human digestibility. 23andMe and other DTC companies differ because of different methods and parameters in those methods, that are determined by what humans want out of these techniques. But the data, that’s pretty straightforward and robust.

If you are interested in a more philosophical take, Joe Pickrell’s What is ancestry?

Addendum: My conversation with Hong was very wide-ranging. We talked about EDAR, random mating populations, and local ancestry deconvolution. Well, perhaps not in those words. It’s a little saddening to me that ultimately what came out of all that is a piece which tries to paint 23andMe as prejudiced against minorities. The only prejudice they exhibit as a firm is against smaller market share.

 
• Category: Science • Tags: 23andMe

sichuan

No matter the Yelp reviews, if it doesn’t have dry pot or whole boiled fish on the menu, not worth it. Also, should feature something where the peppercorn is salient.

 
• Category: Miscellaneous • Tags: Sichuan cusine

20160821_152743 (1) I got this hot sauce at Whole Foods. The original Whole Foods.

What a disappointment. Salty. Without much other flavor besides the spice. It was like a watery spin on Louisiana hot sauce. I couldn’t taste the “aromatic spices” and “fresh herbs.” And don’t tell me it is because it’s too spicy, I didn’t find it too spicy. I did find it very salty though.

 
• Category: Miscellaneous • Tags: Hot Sauce

NIHMS626145.html

In 2011 I was having dinner with an old friend who was an engineer at Intel. He also has a Ph.D. from MIT. Smart guy. But when I mentioned casually offhand that we were all a few percent Neanderthal (outside of Africa), he was surprised. I was a bit shocked, as I explained that this was a huge science story. The Neanderthal genome had been published the previous year. How could my friend not have known?

He was totally unembarrassed, and told me I overestimated how closely the public followed genetics and paleontology. I’m sure he was right. But it’s hard to remember sometimes.

We’ve gone further beyond where we were in 2010. We now have a really good grasp of a lot of population dynamics in Eurasia over the past 20,000 years. Probably the best place to start is with this preprint, The genetic structure of the world’s first farmers. But the general outlines were already evident a few years back in Toward a new history and geography of human genes informed by ancient DNA.

Most of the world’s population seems to descend from a mixing of a set of groups which 10,000 years ago were distinct. How distinct? We’re talking about Fst values on the order of 0.10, which means that ~10% of the variation genetically is partitioned across two pairwise populations. That’s about what you see between Europeans and Chinese today. Some of the Fst values were a bit higher, some lower, but the 0.10 seems about right.

BlankMap-Worl To make it easy for some of you, I’ve labeled and placed the approximate locations of ancestral groups to modern Northern Europeans ~10,000 years ago. What I’m trying to represent is a map which shows the modal regions of distribution of ancestors that Northern Europeans today had 10,000 years ago. So, for example, since ~15% of the ancestry of Northern Europeans is “Ancient North Eurasian” (ANE), a lot of ancestors of Northern Europeans alive today would be living somewhere in the broad expanse of Central Eurasia (now, because of various demographic events the number of ANE was probably lower than farmers, perhaps lower than the 15% contribution to the modern genomes).

A substantial proportion of the ancestry of Northern Europeans is “European hunter-gatherer,” dating to the Pleistocene. But here’s the kicker: most of that ancestry dates to after the LGM, to about ~15,000 years ago. The really deep Pleistocene ancestry in Europe is only found at very low levels now.

The final issue is that a lot of the phenotypes that we racially code are recent. This probably explains why groups like the Kalash and Nuristanis can look more like Europeans than South Asians, but they’re genetically more like South Asians.

What does any of this have to do with non-scientific things? I don’t really know. My interest in population structure is intellectual, not personal. But a certain type of person should probably stop talking about how white people have been in Europe for 40,000 years. First, the ancestors of modern Europeans 40,000 years ago were almost all residing outside of Europe. An assertion that holds until 15,000 years ago. And most would still be resident outside of Europe 8,000 years ago as depending on how you count/calculate* And, perhaps more importantly, the typical phenotype of Northern Europeans probably really coalesced only around ~5,000 years ago.

* Definitely true for Southern Europeans, but conditional on Northern Europeans depending on where you draw Europe’s eastern boundary.

Addendum: I stole the title from John McWhorter’s book, Our Magnificent Bastard Tongue.

Also, this is not to say that

1) population structure today is trivial in a phylogenetic sense, it isn’t.

2) it is not to say that population structure functionally irrelevant, it isn’t.

 
• Category: Science • Tags: Genetics, Genomics

So I don’t really have strong opinions on the whole controversy over women’s sports at the elite level…mostly because I have a really hard time following all the logic. For me the biggest problem seems to be that we have two categories, men’s and women’s, and there are those who are arguing that they’re actually nearly plastic catchalls…which then suggests to me we shouldn’t have two categories in the first place in competition at the highest levels.

With that in mind, D. J. Grothe points me to this prescient interview from a few months back, Hyperandrogenism and women vs women vs men in sport: A Q&A with Joanna Harper. Joanna Harper is a transwoman who is (was?) also a competitive racer and a sports scientist. This portion is where the facts stand:

I would also like to relate a two-part epiphany that I had after my transition. In 2005, nine months after starting HRT, I was running 12% slower than I had run with male T levels; women run 10-12% slower than men over a wide range of distances. In 2006 I met another trans woman runner and the she had the same experience. I later discovered that, if aging is factored in, this 10-12% loss of speed is standard among trans women endurance athletes. The realization that one can take a male distance runner, make that runner hormonally female, and wind up with a female distance runner of the same relative capability was life changing for me.

As they say, “read the whole thing.” It’s long, and detailed, and doesn’t offer easy answers. Ultimately the reality is that no “solution” is going to be fair to world-class athletes. But, it’s probably important to remind ourselves that it is also unfair to those of us without the genetics of world-class athletes, and we seem to be OK with that.

Compare and contrast with this piece from Let Caster Run! We Should Celebrate Semenya’s Extraordinary Talent. The title really captures the reality that it was pretty obvious that the author was going to come down on one side, and would make a lawyerly case. Rather disappointed with Nate Silver’s shop.

 
• Category: Science • Tags: Science, Sports

61lWPI+qpGL._SY344_BO1,204,203,200_ Guy Gavriel Kay’s Children of Earth and Sky is set in the same world as the Sarantine Mosaic duology, and the Lions of Al-Rassan, The Last Light of the Sun, and A Song for Arbonne. I’ve enjoyed Kay’s work for more than half my life at this point, so no surprise that I enjoy Children of Earth and Sky. As I’ve noted before, Kay is arguably the world’s greatest historical fantasist, and for someone like me it’s always pleasurable to make connections between our own real history, and his secondary creation. This sort of fantasy is more magical, than characterized by magic.

I know I have readers in India because of IP addresses. Keep an eye out for my byline in India Today, where I’ll make some contributions now and then. The first should drop this Friday in print and online, a short review of Shadi Hamid’s Islamic Exceptionalism. An Indian friend told me that India is one nation where the sales of print are actually increasing, so I’m curious how this will go.

On Twitter most of my blocks come because I’m being tweeted at directly by someone. If I don’t follow you on Twitter in most cases I don’t want to be bothered. The main reason I block isn’t because I’m a coward or I feel unsafe. It’s because the person is probably stupid, and starting to annoy me. Sometimes, it’s because they want me to make a point that they want to make. Needless to say, I don’t take kindly to that. Between all my various adult responsibilities that I have now at this age, I don’t really feel guilty at all muting stupid people (who invariably think they’re genius, because you know, they’re stupid).

So you’ve convinced me that functional programming is the way to go.
Screenshot 2016-08-21 02.02.00 Since my genotype is public somehow it got used in an rnsnps tutorial. Pretty funny.

Also, Running Structure-like Population Genetic Analyses with R. Looks like there are some interesting visualizations of admixture components which are feasible with the new program.

People keep emailing me about the HGDP plink data set. I think I removed where it initially was, and it’s linked to my old Admixture tutorials. Well, download this zip, and look at the .fam file. It has clear population labels, so you should be able to do what you want in Plink.

Should We Be Having Kids In The Age Of Climate Change? The arguments really go all the way back to the ZPG movement. Actually, they’ve popped up in philosophical movements from the beginning of time. The world is a “vale of tears”, etc. Myself, I have no guilt about having children. My children are attractive, and seem rather intelligent so far. Would that more children like mine exist in the world!

Stop Tweeting Your #Firstsevenjobs: It’s just a way to disguise your privilege. FUCK YOU. The author of the piece has a degree in French language and literature from Columbia university according to her Linkedin. She gets to write for a living for Slate about food, and was editorial assistant for Mark Bittman. What. The. Fuck. She gets paid to write about food! She was Mark Bittman’s assistant. I guess it takes one to know one. Not that the author tries to mask her privilege: “But this list doesn’t tell you that I went to an Ivy League school and graduated without debt, since my parents were able and willing to pay for my tuition.”

I hate it when people say that gender is a continuum, because that tacitly brings to mind a uniform distribution. It’s not. It’s highly bimodal.

Lou Pearlman is dead. The weirdest thing about his career is that several stories have implied he became a boy-band impresario because he was a closeted gay man, and that was a way for him to have access to young vulnerable teenagers. The fact that he became very prominent in the late 1990s boy-band boom was almost a coincidence.

Sarah Haider has been accused of being a white supremacist.

Let Caster Run! We Should Celebrate Semenya’s Extraordinary Talent. As they would say, “I don’t even.”

The company I work for has a 20% discount on kits right now. So if you want your dog to get genotyped on 200,000 markers, and get ancestry and health, it’s a good time as any.

What are you reading?

The Amazing Atheist youtube channel has some pretty funny videos. E.g.,

 
• Category: Miscellaneous • Tags: Open Thread

n20307 Taking a break in my work of the day I stumbled upon the fact that Bernard Cornwell’s series based on King Alfred’s period, which began with The Last Kingdom, is a Netflix series. To be honest I much preferred the three volume Warlord Chronicles, set more than three centuries earlier, in post-Roman and pre-Saxon Britain. A retelling of the Arthurian romance with not too much romance, George R. R. Martin admitted to me in correspondence in the late 1990s that he quite enjoyed it as well. The protagonist of The Last Kingdom is peculiarly similar to the one in Warlord Chronicles.

As a fan of alternate history I’ve occasionally stumbled upon the “what-if” scenario whereby Alfred’s Wessex is conquered, and England becomes Daneland. Would we today be speaking another Scandinavian language? Would Christianity disappear, and the pagan rites of the Norse come to rule the day? It seems broadly likely that that would not be cause at all.

First, the victory of Christianity in Europe was overdetermined by the 9th century. Even in this period there was a Christian presence in Scandinavia. A Scandinavian ruled England would almost certainly be a Christian one. And in fact in the century before the Norman conquest the Scandinavians created a hybrid society with the native English. Harold Godwinson had a Danish mother, and connections to the Danish monarchy.

The second issue is one of language. The English language of Alfred’s time was much more Germanic, so the gap between it and the tongue of the Danes was not that large in any case. And, from what I have seen, it seems that the number of Scandinavians in relation to the native population was much smaller than that of the Saxons in relation to the British, though even in the latter case it must be acknowledged that the Germans who arrived in the 5th to 6th centuries were numerically outnumbered by the native Romano-British (see PoBI results).

Perhaps if the kingdom of Wessex fell England’s identity would be more indubitably aligned with Scandinavia, as it was arguably in the decades before Norman conquest in any case. But cultural identities can be curiously resilient. The Finns endured nearly 600 years of Scandinavian domination, but maintained their language, while the long Irish interaction with the Vikings still left the Irish identity intact.

 
• Category: History • Tags: History

Screenshot 2016-08-19 02.55.07

Joe Pickrell and Yaniv Erlich did an AMA on Reddit yesterday. I recommend you check it out.

They promote their new project, seeq. It looks pretty slick, and I’m excited to be part of the batch of beta testers.

 
• Category: Science • Tags: Genomics

51szD9HC9pL._SX258_BO1,204,203,200_ Obviously I’m doing more development right now than I would have expected. But in the long term I want to move beyond hacking to survive for the present, and write some code that’s sustainable. So I think I want to read a design patterns book. The last one I read was 15 years ago and I don’t really have much retention of it. I’m particularly interested in stuff geared toward Python (the language I’m starting to get comfortable in right now).

Readers with recommendations are invited to weigh in. I know I have a fair number of software engineers in the readership, so I’m asking for your thoughts and suggestions. Perhaps the classic from the GoF is still the way to go? Remember, I’m not a software engineering who works on scientific data, I’m a scientists who sometimes needs to do a little engineering and data analysis.

Note:
Sean, if you take this as an opportunity to leave a long-winded comment about sexual selection and blond women, again, I’m going to have to finally ban you!

 
• Category: Miscellaneous • Tags: Engineering

512QZUX2sSL._SX331_BO1,204,203,200_ Over at The Genetic Literacy Project Jon Entine has a post up, Usain Bolt’s Olympic gold proves again why no Asian, white–or East African–will ever be crowned world’s fastest human. Fifteen years ago Jon wrote Taboo: Why Black Athletes Dominate Sports And Why We’re Afraid To Talk About It, so he knows something about this topic.

Actually, I think Jon is wrong on this. Better drugs and biological engineering mean that I suspect at some point in the near future the fastest “human” alive is going to be non-African, and, if I had to bet, Chinese. But you know what Jon meant.

There is a lot of detail in Jon’s post because he knows a lot about this topic. But at the end of the day the specific details are less important than the general theoretical framework, which makes it unsurprising that a single group of humans who are genetically related dominate sprinting. Unlike figure skating, sprinting is entirely objective. All that matters are physical inputs. Second, unlike swimming, which is also objective, sprinting seems to have pushed very close to the boundaries of what non-modified or drug-enhanced individuals are capable of. To my knowledge there’s no expectation of a Fosbury Flop in sprinting.

Therefore, sprinting is selecting for raw ability. Training is not irrelevant, but the issue with training is that others can train too. What can’t be mimicked is raw ability due to one’s biological aptitudes and abilities (again, excepting bioengineering). Let’s assume that Olympic caliber sprinters are among the 10,000 fastest humans on the planet, because not all people with the aptitudes become sprinters. Assuming a normal distribution, that’s about five standard deviations above the human norm. I suspect I’m being conservative. Someone like Usain Bolt is probably a six standard deviation unit human. Google tells me that a fit human can run the 100 meter dash in 13.5 seconds. The world record is about 9.5 seconds. The absolute range here is not incredibly large. Small differences in the mean across populations suggest that when you select for extreme individuals those small differences will make all the difference.

If sprinting was less objective, then there would probably be more equality in outcome. I suspect judges would be biased for various reasons, and one set of nations or people of a particular ethnic background dominating a field can get quite embarrassing. But sprinting is rather objective, and the socioeconomic obstacles are low. Given basic nutrition, and the ability to huff it, you have a shot. What matters is the magnitude of your ability.

principlespopulationgenetics One peculiar thing population genetics teaches us that non-adaptive traits are more heritable. This is due to the fact that selection tends to remove variation, selecting for fitter individuals. Humans are good runners, there are entire evolutionary theories based around our biomechanical modifications and adaptations. But there’s really no benefit in running in bursts of 10.5 in the 100 meter dash vs. 9.5. We’re not that sort of ambush predator. There’s probably some heritable variation in burst ability, but it’s small, and not visible in any normal set of tasks among large groups of humans.

But modern competitive sports at the Olympic level is not selecting for normality, it’s selecting from outliers. It isn’t that West Africans were guaranteed to be the best sprinters, it’s just that a priori it shouldn’t be surprising that in such a non-adaptively beneficial trait as running a few seconds faster in the 100 meter dash some populations had the genetic die loaded in their direction.

Note that I’m not denying any sort of selective or adaptive argument. There’s a fair amount of evidence that there is some selection in favor of greater height in Northern Europeans vs. Southern Europeans, which probably explains why Lithuanians are more prominent in basketball in relation to their numbers than Italians. But the selection wasn’t for basketball, and the fact that there is heritable variation suggests that selection wasn’t that strong and unidirectional….

Humans vary. Populations vary too. When you select from the tails of the distribution, the differences between populations are going to be very noticeable. If a sport is objective, and pushing its limits, it will select from the tails of the distribution.

 
• Category: Race/Ethnicity, Science • Tags: Race, Sports

600px-Ptolemaicsystem-smallSabine Hossenfelder on her side gig as a physics consult, What I learned as a hired consultant to autodidact physicists:

Sociologists have long tried and failed to draw a line between science and pseudoscience. In physics, though, that ‘demarcation problem’ is a non-problem, solved by the pragmatic observation that we can reliably tell an outsider when we see one. During a decade of education, we physicists learn more than the tools of the trade; we also learn the walk and talk of the community, shared through countless seminars and conferences, meetings, lectures and papers. After exchanging a few sentences, we can tell if you’re one of us. You can’t fake our community slang any more than you can fake a local accent in a foreign country.

I haven’t learned any new physics in these conversations, but I have learned a great deal about science communication. My clients almost exclusively get their information from the popular science media. Often, they get something utterly wrong in the process. Once I hear their reading of an article about, say, space-time foam or black hole firewalls, I can see where their misunderstanding stems from. But they come up with interpretations that never would have crossed my mind when writing an article.

I’ve been blogging since 2002. Like Sabine I can often tell if someone has a scientific background after a few sentences, especially if they are biologists of some sort. As for the rest, the chasm is between the intelligent vs. not so intelligent, and it is usually pretty clear too. Mostly the intelligent have liberal arts or social science backgrounds, but have the basic analytic tools to decompose problems at the most general levels. The less intelligent tend to speak in simple formulas when coherent, and devolve into total incomprehensibility when they try and attempt originality.*

The second issue is a somewhat different one from physics. Usually at a given moment there is a topic of particular interest to the media. Evo-devo and epigenetics come to mind. These are real scientific fields of inquiry. But because of disproportionate media attention to these sorts of topics, usually those who rely on their science knowledge from popularizations will assume that evo-devo and epigenetics have “revolutionized” our understanding of evolution and genetics, when in reality these are still developing areas, whose ultimate impact is to be determined.

In fact, I’d take this further: the area of evolutionary genetics has arguably not been “revolutionized” since the 1970s, with the theoretical and empirical debates triggered by allozyme work and the neutralist-selectionist debates. All the rest, including genomics, is just commentary.

* Here is a good example: the stupid reader who was explaining to me patiently how splicing and gene regulation “disprove” heritability estimates. I dismissed them, but the reality is that I’m 99% sure that that reader thinks I’m an idiot as well.

 
• Category: Science • Tags: Science

41ezBQHrx7L Spencer Wells, along with many others, such as Jared Diamond, argued that agriculture was a disaster in terms of what it wrought for the quality of life for the average human in his book Pandora’s Seed. This is broadly plausible to me. On the other hand, I also think it is highly likely that agriculture and civilization were basically inevitable.

The “great leap forward” in cultural complexity and explosion of symbolic expression ~50,000 years ago, give or take, seems likely to have been only the culmination of a process of encephalization and increased sophistication which had proceeded over millions of years. The precursors to the agricultural life were likely already there before the Holocene.

To a great extent the hypothesis of inevitability has been tested: in the Americas much of the dynamics which characterize the Old World were recapitulated. Agriculture, civilizations with writing and class stratification, and monumental architecture, all with analogs in the Old World, are there. In fact, this National Geographic piece, In Search of the Lost Empire of the Maya, is fascinating to read, because it seems to me that it likely parallels developments in the Old World two thousand years before. The Snake Kings were warlords in a manner which would have been familiar to the “Great Kings” of the ancient Near East.

There are two great schools of history from the pre-modern era. Those which are cyclical, and those which exhibit some intuition that there is an endpoint or progress. The “independent” experiments of human history suggest that both are true, with an arc of history on the macroscale scaffolded by innumerable cycles of rise and fall.

 
• Category: History • Tags: History

The-Ocean-of-Churn I just bought my friend Sanjeev Sanyal’s book, The Ocean of Churn: How the Indian Ocean Shaped Human History. Sanjeev is a polymath with varied interests, some of which intersect with my own. A few years back I had the pleasure of having dinner with him and Reihan Salam, and the server kept unapologetically offering drinks one of us had ordered to the wrong person. I don’t think we look that much alike!

The top start-up mecca in America is far from Silicon Valley. It’s cheap to live here, and fun for young brogrammers. Also, not too long a flight from elsewhere. As Mark Krikorian observed on Twitter being a blue bubble in a red state means that Austin can take advantage of low-cost and low-tax public policies, while maintaining a culturally liberal social aesthetic.

Bought Python Essential Reference.

Hubby and Lewontin on Protein Variation in Natural Populations: When Molecular Genetics Came to the Rescue of Population Genetics.

Sausage Party is a surprising mix of high and lowbrow.

Update: If I don’t post your initial comment, posting five additional times won’t result in your comment being posted.

 
• Category: Miscellaneous • Tags: Open Thread
Razib Khan
About Razib Khan

"I have degrees in biology and biochemistry, a passion for genetics, history, and philosophy, and shrimp is my favorite food. If you want to know more, see the links at http://www.razib.com"