E-BY6312, Abraham Brouwer (b. by 1667- ) An Update

The post of September 5, 2018, "Status of the Adam Brouwer Sub-Group of the Brewer DNA Project," gave an overview of the seven sons of Adam Brouwer with regards to the status of Y-DNA testing of known descendants at the Brewer DNA Project. This post is directed at no. 6 Abraham Brouwer, who was born by 1667, of whom you can find some background in the post of December 4, 2012. It is important to note that Abraham Brouwer had only two sons (Jeury and Abraham), both of whom left descendants. In September 2018 we had two tested descendants, both descendants of the son Abraham (1706-1755 or 56) who also were closely related (uncle and nephew). Their two tests helped to define a SNP for this branch of Adam Brouwer descendants. That SNP is E-BY6312 which can be seen here on YFull's YTree (current version v7.09.01).

The update is that a third descendant of Abraham Brouwer (b. by 1667), a descendant of the other son, Jeury Brouwer (prob. b. 1700-05, d. by 4 Feb 1784) has taken the BigY-700 test (FamilyTreeDNA)* and the results show that he too has the SNP, E-BY6312. As the three tested descendants of Abraham Brouwer (b. by 1667) share this one SNP that is not found among other tested descendants of Adam Brouwer, and as the three are descended from the two different sons of Abraham (b. by 1667), it appears that we can now state that Abraham Brouwer's branch of descendants from Adam Brouwer can be defined by E-BY6312.

From Hank Graham, Administrator of the Brewer DNA Project, "The above results are the first time we can give a specific sub-clade designation to one son of Adam Brouwer."

Other SNPs are involved here that tell more of a story as related by Hank Graham in an email -

 The results have clarified when the five SNP markers of sub-clade E-BY6312 appeared in the line of Adam's son Abraham (b.by 1667).  Kit#88228, kit#161350 and kit#438438 share SNPs BY6312 and BY6315 that were present in their Most Recent Common Ancestor (MRCA) Abraham Brouwer (b. by 1667) placing them in sub-clade E-BY6312 of Haplogroup E-BY6201.  Kits#161350 and kit#438438 are placed in a more recent subclade E-BY6313 consisting of  SNPs BY6313, BY6316 and Y56389  that first appeared at various times over seven generations in their common line from Abraham (b. 1706) and their MRCA Leon Brower (b. 1893).  Sub-clade E-BY6313 is a sub-clade of E-BY6312 a sub-clade of Haplogroup E-BY6201.

 The above results are the first time we can give a specific sub-clade designation to one son of Adam Brouwer.  All descendants of Abraham Brouwer (b.by1667) are in sub-clade E-BY6312 consisting of BY6312 and BY6315 and anyone tested for either SNP and found to be have that SNP is a descendant of Abraham Brouwer (b.by1667).  STR marker DYS572=10 in Adam Brouwer descendants tested to the YDNA67 level is a useful hint, not a proof, of descent from Abraham Brouwer (b.by1667).  DYS572 is present in only these three men of the 34 men tested by the YDNA67 test.

 The most significant chromosome variation within a family results when a single nucleotide at a specific location on the Y chromosome  changes from the normal (ancestral) nucleotide at that chromosome location to another (derived) nucleotide at that same position.  These changes are called  private variants, but when a private variants  matches the private variant in another man it  is given a specific name, SNP and the matching SNPs indicate a related subgroup (SUBCLADE) within the family. The time period that the SNP or subclade formed can be estimated by determining the most recent common ancestor of the two men as the most recent time the SNP and subclade could have appeared and combining that with  an earlier common ancestor that  is ancestral for the SNP.  The matching private variants identified by either FTDNA or YFull  with any BigY test result create a virtually absolute proof that the men share a MRCA within the family group.  Subclades and their related SNPs  appear in the line of several of Adam's sons.   E-BY6312 is the first sub- clade in the Adam Brouwer group  that meets the criteria that descendants from other son's of Adam Brouwer (b. ca. 1620) ancestral at the chromosome position of SNPs BY6312 (ChrY 6850508 , Hg38) and BY6315 (ChrY 15719803,  Hg38)  while kits #88228, #161350 and #438438 are derived at those two chromosome positions.

The YFull YTree will not be updated until the new test results are received ans analyzed there, so here a chart of how the Adam Brouwer branch of the YTree now looks:

E-Y19643 (E-BY6201) (Adam Brouwer), f. 3600 ybp^[i]

├── E-BY6245, f. 350 ybp^[ii]

├── E-BY6312 (Abraham Brouwer), f. 350 ybp^[iii]

│   └── E-BY6313

└── E-BY52688, f. 350 ybp^[iv]

---

^[i]YFull YTree, online <https://www.yfull.com/tree/>, v7.09.01 (Nov. 25, 2019). TMRCA = 350 ybp. Their common ancestor is Adam¹ Brouwer, probably b. 1610-1620 in Cologne, d. 1692 at Gowanus, Long Island, New York.

^[ii]Ibid., v7.09.01 (Nov. 25, 2019). TMRCA = 225 ypb. Their known EKA is Peter Brewer, b. ca. 1765 probably in New Jersey, d. 1840 in Hardin Co., Kentucky. The direct paternal ancestry of Peter Brewer, back to Adam¹ Brouwer, is not known.

^[iii]Ibid., v7.09.01 (Nov. 25, 2019). Their EKA is Abraham² Brouwer, son of Adam¹ Brouwer.

^[iv]Ibid., v7.09.01 (Nov. 25, 2019). TMRCA = 350ybp. The EKA of one is Nicholas² Brouwer, son of Adam¹ Brouwer. The EKA of the other is Charles Henry Brower (1820-1860) of Philadelphia, PA whose direct paternal ancestry back to either Nicholas or Adam Brouwer is not known.

Hopefully as more descendants of Adam Brouwer, descendants of his other sons, join the Project and as existing members upgrade to the BigY-700, we will be able to identify identifying SNPs for Adam Brouwer's other six sons.


*In September 2018 the most comprehensive test at FamilyTree was the BigY-500. That test has since been upgraded to the BigY-700. All three tests involved here have been upgraded to the BigY-700.

BGB 664