Tag Archives: metspalu

Metspalu Ref3 Admixture Individual Results

I ran supervised admixture on the Metspalu et al dataset using my reference 3 data. AV asked for individual results, so here they are.

Here's the spreadsheet for Metspalu individual admixture results. You can compare with the reference 3 results.

Here's our bar chart. Remember you can click on the legend or the table headers to sort.

Metspalu Dataset Update

Dr. Metspalu, who has been very good about sharing data and information, has informed me about a couple of cases of mislabeling in the Metspalu et al dataset.

Our sample labelled D238 and reported as Tharu is in fact a Brahmin sample from Uttar Pradesh.

Following the publication we have identified that sample evo_32 was erroneously labelled as Kanjar before any genetic analyses. We hereby re-label the sample as belonging to Kol population.

Thus, I have updated the Metspalu admixture results and clustering results.

Metspalu Ref3 Admixture Results

I ran supervised admixture on the Metspalu et al dataset using my reference 3 data. Here's the spreadsheet for Metspalu admixture results. You can compare with the reference 3 results.

Here's our bar chart for Metspalu results. Remember you can click on the legend or the table headers to sort.

These are very different from Dienekes for some reason.

UPDATE (Dec 13 10:04am): I found a major error. I had used the population info file I had downloaded from the paper instead of my reformatted one and thus I had not merged that info with the correct IDs with the admixture results. So the previously posted results were junk. I have fixed that now and the results are as expected.

Metspalu et al Data Relatedness

I performed IBD analysis on the Metspalu dataset using plink and found the relatedness of the following samples to be too high.

ID1 Source1 Population1 ID2 Source2 Population2 IBD Estimate
Mawasi1 Metspalu Mawasi Mawasi1 Chaubey Mawasi 100%
VELZ260 Metspalu Velama Velama_184_R2 Reich Velama 99%
VELZ260 Metspalu Velama VELZ265 Metspalu Velama 19%
VELZ265 Metspalu Velama Velama_184_R2 Reich Velama 19%
D254 Metspalu Tharu Tharu_107_R1 Reich Tharu 99%
D260 Metspalu Tharu Tharu_108_R1 Reich Tharu 98%
evo_32 Metspalu Kanjar 321e Metspalu Kol 53%
HA030 Metspalu Dharkar HA039 Metspalu Dharkar 52%
A387 Metspalu Dusadh A388 Metspalu Dusadh 52%
A394 Metspalu Dusadh A395 Metspalu Dusadh 52%
A395 Metspalu Dusadh A393 Metspalu Dusadh 46%
A394 Metspalu Dusadh A393 Metspalu Dusadh 45%
A392 Metspalu Dusadh A393 Metspalu Dusadh 32%
A392 Metspalu Dusadh A395 Metspalu Dusadh 31%
A392 Metspalu Dusadh A394 Metspalu Dusadh 28%
evo_37 Metspalu Kanjar HA023 Metspalu Dharkar 27%
HA039 Metspalu Dharkar HA041 Metspalu Dharkar 24%
HLKP245 Metspalu Hakkipikki Hallaki_137_R2 Reich Hallaki 22%
PULD160 Metspalu Pulliyar PULD162 Metspalu Pulliyar 20%

As you can see, three samples from Reich et al seem to be the same as Metspalu et al. In addition, two Reich samples seem to be related to Metspalu samples.

There are some Metspalu samples who are likely related to one another. A 50% indicates likely a parent-child or sibling-sibling relationship. A 45-46% relatedness is most likely siblings in my opinion. An 18-19% percentage could be a 1st cousin relationship in an endogamous community. it could also just be the background relatedness in a small, bottlenecked and endogamous community.

It looks like about half of the Dusadh in the Metspalu dataset are related.

I am surprised at the close relationship of a Kanjar and a Kol in the dataset, though both are from Uttar Pradesh.

Shared and Unique Components of Human Population Structure and Genome-Wide Signals of Positive Selection in South Asia

Metspalu et al have a new paper in American Journal of Human Genetics about South Asian genetics. Here's the abstract:

South Asia harbors one of the highest levels genetic diversity in Eurasia, which could be interpreted as a result of its long-term large effective population size and of admixture during its complex demographic history. In contrast to Pakistani populations, populations of Indian origin have been underrepresented in previous genomic scans of positive selection and population structure. Here we report data for more than 600,000 SNP markers genotyped in 142 samples from 30 ethnic groups in India. Combining our results with other available genome-wide data, we show that Indian populations are characterized by two major ancestry components, one of which is spread at comparable frequency and haplotype diversity in populations of South and West Asia and the Caucasus. The second component is more restricted to South Asia and accounts for more than 50% of the ancestry in Indian populations. Haplotype diversity associated with these South Asian ancestry components is significantly higher than that of the components dominating the West Eurasian ancestry palette. Modeling of the observed haplotype diversities suggests that both Indian ancestry components are older than the purported Indo-Aryan invasion 3,500 YBP. Consistent with the results of pairwise genetic distances among world regions, Indians share more ancestry signals with West than with East Eurasians. However, compared to Pakistani populations, a higher proportion of their genes show regionally specific signals of high haplotype homozygosity. Among such candidates of positive selection in India are MSTN and DOK5, both of which have potential implications in lipid metabolism and the etiology of type 2 diabetes.

I'll have some comments later today.