Without wanting to rehash things this blog post and following ones will provide a quick recap of my final AncestryDNA survey findings for continental Africans. These results were obtained during 2013-2018 but I had not fully processed all the data up till now. Continuing with my North & East African section. Which I first published on 20 November 2016 when I had only 58 North & East African AncestryDNA results available for my analysis (see this overview). As my survey has been ongoing I have managed to collect a sample group which has now more than doubled in sample size. Consisting of no less than 135 AncestryDNA results of North & East African persons! Follow the link below for detailed analysis & new screenshots:
Table 1 (click to enlarge)
I discontinued this survey after Ancestry’s update in September 2018. Because in my opinion Ancestry’s new version of their ethnicity estimates regrettably has been a downgrade in regards to their African breakdown, overall speaking (see also this blogseries). Which is why I think these “old” results may still be useful and are not obsolete yet. I originally singled out two main implications for Afro-Diasporans which I still stand by.
- Careful follow-up research is required to substantiate any DNA results seemingly suggesting East African lineage.
- Careful follow-up research is required to substantiate any DNA results seemingly suggesting North African lineage.
Then again my intention is not only to look backwards but also forwards! In particular I believe that this dataset may provide a helpful baseline to compare with 23andme’s newly updated African breakdown (see this overview). Furthermore my findings may also serve as a benchmark for Ancestry’s upcoming update, which hopefully this time will lead to improvement! I find that currently 23andme is much better equipped to detect Northeast African & North African lineage. While also the distinction made for Southeastern African lineage on 23andme is particularly useful for Afro-Diasporans seeking to validate seemingly East African DNA test results.
From what I have seen (see this page) the new “Eastern Africa” category on Ancestry is much less predictive for actual East Africans. While interpretation for Afro-Diasporans is often tricky. When it comes to the new “Northern Africa” region on Ancestry the record is mixed. With interpretation again being tricky for Afro-descendants. More clarity may be obtained however when you critically assess your North and/or East African DNA matches, if you happen to have them. Taking into account shared segment size and the possibility of population matches and false positives, so that only genuine IBD matches are left over. Scroll down to sections 3 & 4 of this page for how I performed such a task for 50 Cape Verdeans and their 180 North African & 9 East African matches.
Over all I would say that my African survey findings are pretty much reinforcing the main message I have been trying to get across from day 1: the labeling of ancestral categories in DNA testing is often not be taken too literally. However this does not mean you cannot derive a great deal of informational value from your socalled ethnicity estimates! Proper interpretation is a precondition. And it has been my experience that being aware of the DNA results of native Africans certainly helps in this regard. Even more so when also taking into account your African DNA matches, relevant historical context, (advanced) genetic genealogy and other means of follow-up research.
***(click to enlarge)