Results 1 to 1 of 1

Thread: F4-ratio analysis of Neanderthal Admixture in Africans

  1. #1
    Registered Users
    Posts
    29
    Sex
    Location
    Canada
    Ethnicity
    Somali
    Y-DNA (P)
    T-L208
    mtDNA (M)
    N1b2

    Canada Somaliland

    F4-ratio analysis of Neanderthal Admixture in Africans

    I've been trying to find out exactly how much Neanderthal admixture there is in a variety of African and Eurasian populations using the 1240K dataset from Reich Labs. I did this mostly to serve as a sort of "Tracer dye" for the Eurasian admixture in a variety of African Groups using South_Africa_2000BP

    I'm using Vindija Chimp: X South_Africa_2000BP:: Vindija Chimp: Altai South_Africa_2000BP

    HTML Code:
                                                                                                               alpha     std. err  Z (null=0)
     result: Neanderthal_Vindija      Chimp  Somali.DG South_Africa_2000BP  : Neanderthal_Vindija      Chimp Altai_Neanderthal South_Africa_2000BP     0.013782     0.004592      3.001 9d
     result: Neanderthal_Vindija      Chimp   Dinka.DG South_Africa_2000BP  : Neanderthal_Vindija      Chimp Altai_Neanderthal South_Africa_2000BP     0.002405     0.004292      0.560 9d
     result: Neanderthal_Vindija      Chimp     Yoruba South_Africa_2000BP  : Neanderthal_Vindija      Chimp Altai_Neanderthal South_Africa_2000BP     0.002891     0.003486      0.829 9d
     result: Neanderthal_Vindija      Chimp       Mota South_Africa_2000BP  : Neanderthal_Vindija      Chimp Altai_Neanderthal South_Africa_2000BP     0.008980     0.004720      1.902 9d
     result: Neanderthal_Vindija      Chimp   Dinka.DG South_Africa_2000BP  : Neanderthal_Vindija      Chimp Altai_Neanderthal South_Africa_2000BP     0.002405     0.004292      0.560 9d
     result: Neanderthal_Vindija      Chimp Cameroon_SMA South_Africa_2000BP  : Neanderthal_Vindija      Chimp Altai_Neanderthal South_Africa_2000BP     0.000715     0.003902      0.183 9d
     result: Neanderthal_Vindija      Chimp      Biaka South_Africa_2000BP  : Neanderthal_Vindija      Chimp Altai_Neanderthal South_Africa_2000BP     0.000265     0.003669      0.072 9d
     result: Neanderthal_Vindija      Chimp   Mandenka South_Africa_2000BP  : Neanderthal_Vindija      Chimp Altai_Neanderthal South_Africa_2000BP     0.001049     0.003468      0.302 9d
     
     
     result: Neanderthal_Vindija      Chimp       PPNB South_Africa_2000BP  : Neanderthal_Vindija      Chimp Altai_Neanderthal South_Africa_2000BP     0.031501     0.005650      5.575 9d
     result: Neanderthal_Vindija      Chimp   Tianyuan South_Africa_2000BP  : Neanderthal_Vindija      Chimp Altai_Neanderthal South_Africa_2000BP     0.035889     0.006158      5.828 9d
     result: Neanderthal_Vindija      Chimp        WHG South_Africa_2000BP  : Neanderthal_Vindija      Chimp Altai_Neanderthal South_Africa_2000BP     0.046918     0.004904      9.568 9d
     result: Neanderthal_Vindija      Chimp        CHG South_Africa_2000BP  : Neanderthal_Vindija      Chimp Altai_Neanderthal South_Africa_2000BP     0.035868     0.004678      7.668 9d
     result: Neanderthal_Vindija      Chimp Anatolia_N South_Africa_2000BP  : Neanderthal_Vindija      Chimp Altai_Neanderthal South_Africa_2000BP     0.039269     0.004134      9.498 9d
     result: Neanderthal_Vindija      Chimp   Natufian South_Africa_2000BP  : Neanderthal_Vindija      Chimp Altai_Neanderthal South_Africa_2000BP     0.028360     0.006696      4.235 9d
     result: Neanderthal_Vindija      Chimp Iberomaurusian South_Africa_2000BP  : Neanderthal_Vindija      Chimp Altai_Neanderthal South_Africa_2000BP     0.022338     0.004558      4.900 9d
     result: Neanderthal_Vindija      Chimp Morocco_EN South_Africa_2000BP  : Neanderthal_Vindija      Chimp Altai_Neanderthal South_Africa_2000BP     0.018169     0.013094      1.388 9d
     result: Neanderthal_Vindija      Chimp   Israel_C South_Africa_2000BP  : Neanderthal_Vindija      Chimp Altai_Neanderthal South_Africa_2000BP     0.034131     0.004459      7.654 9d
     result: Neanderthal_Vindija      Chimp   Iran_ChL South_Africa_2000BP  : Neanderthal_Vindija      Chimp Altai_Neanderthal South_Africa_2000BP     0.037438     0.004123      9.081 9d
     result: Neanderthal_Vindija      Chimp   Iran_N South_Africa_2000BP  : Neanderthal_Vindija      Chimp Altai_Neanderthal South_Africa_2000BP     0.030890     0.005438      5.681 9d
     
    The std errors are a bit large (+/- 0.3-0.6) for the tiny amounts of Neanderthal ancestry present in some groups but are fairly consistent with the major exception being Morocco_EN.

    It is possible to use these Neanderthal percents to check if models of Eurasian admixture into certain populations are plausible.

    Ex. Yoruba can be modeled as 13% Iberomaurusian so lets check if the Neanderthal admixture supports that.

    NenA/NenB = Admixture Rate A<-B (%)

    0.002891/0.022338 = 12.94% Iberomaurusian into Yoruba

    Ex2. Somali.DG can be modeled as 38-39% Israel_C so lets check if the Neanderthal admixture allows us to show the a similar ratio in Somali.DG

    NenA/NenB = Admixture Rate A<-B (%)

    0.013782/0.034131 = 40.38% This percent is slightly higher than expected but that can be accounted for by the extra Neanderthal in Dinka and or Mota.
    Last edited by Mnemonics; 06-25-2020 at 02:28 AM.

  2. The Following 7 Users Say Thank You to Mnemonics For This Useful Post:

     Angoliga (06-25-2020),  blackflash16 (06-24-2020),  Lank (06-25-2020),  Megalophias (06-24-2020),  NetNomad (06-25-2020),  sum1 (06-24-2020),  ThaYamamoto (06-25-2020)

Similar Threads

  1. Replies: 12
    Last Post: 07-02-2020, 01:46 AM
  2. Replies: 4
    Last Post: 12-04-2019, 12:36 AM
  3. Neanderthal Admixture in South Asians
    By traject in forum Southern
    Replies: 9
    Last Post: 03-29-2019, 02:42 PM
  4. Neanderthal dna admixture test
    By Darko in forum Autosomal (auDNA)
    Replies: 6
    Last Post: 12-15-2015, 03:20 PM
  5. Replies: 23
    Last Post: 09-30-2015, 09:46 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •