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Project Results and Discussion
30 June 2009
From Tipperary to Australia and America
Two participants who trace their lines to County Tipperary in Ireland share a 23/25 marker match with a few quite unusual marker values. Their results are presented in Table IV-1. The first row of results in this group is from a descendent of Thomas D’Arcy who was born on a farm near Lorrha in County Tipperary about 1820 1 and arrived in Sydney, Australia on February 18, 1848. 2 The second member of this group can make his earliest connection to John Dorcey, who was in the County Tipperary (North Riding), the Barony of Lower Ormond, the Civil Parish of Kilbarron, the Townland of Lisquilabeen between 1834 and 1852. 3 This John Dorcey immigrated to Michigan in the mid 1850’s only to be killed in the final days of the Civil War.
These two match on 23 of 25 markers with a two-step difference at DYS439 and a one-step difference at DYS458. Both of those markers are thought to mutate more frequently than some of the others. For their mismatched at DYS439, one has one repeat more than the modal value and the other one has repeat less. (This suggests possible one-step mutations in both lines rather than one two-step mutation in one line.) The lower value 11 is found in about 15% of R1b haplotypes and the higher value of 13 is found in about 10%. (This is in contrast to the modal value of 12, which is found in almost 74% of individuals in the R1b Haplogroup.) 4
They also share particularly unusual values of 8 for DYS 459a and 9 for DYS459b—values that are found in only about 2% and 12% of R1b populations respectively. 5 Similarly, their values for DYS numbers 464a, b, and c are very unusual. Their genetic distance from the various other Irish and American Dorsey/D’Arcy/Dorcy/etc lines is from seven to 15 steps.
With their remaining markers matching the very common Atlantic Modal Haplotype and in spite of the five very unusual markers, these two have a number of matches with other surnames in the Family Tree DNA database.
The descendant of Thomas D’Arcy closest matches are 23/25 marker matches with only four, not surprisingly, Irish surnames--O’Brien, Hart, Everett (Graham), and Callahan. It is perhaps the values of 13 at DYS 439 and 16 at DYS458 which are found in only about 10% and 18% of R1b men respectively that sets him apart. The descendant of John Dorcy who has somewhat more typical values for these markers has exact matches with five different surnames, again typically Irish names, Hogan, Casey, Bryan, West, and Donohoe. He has 23-24/25 marker matches as well with 25 others.
Lineage IV DNA results connect them with a group of Irish surnames that have been designated as the Irish Type III Cluster. For more information about that group, see the very nicely done Irish Type III website at http://www.irishtype3dna.org/ As geneticists and historian continue to join forces to map out the lines of descent of the Irish people, we hope to learn more about this interesting cluster and our Dorcey/D’Arcy members’ place in it.
Because these two project members can
place their earliest known ancestor in the same area of Ireland in
the early 1800’s, it would make sense for them to upgrade to the 37
marker test to find out whether this match strengthens and to
attempt to recruit fellow D’Arcy/Darcy/Dorcey participants with
known roots in Tipperary. The American family believes there might
have been a family member who came to Michigan about the same time
as their ancestor but then returned to Ireland only to immigrate to
Though most likely
a coincidence, they share a same somewhat uncommon first name.
1 Bernie D’Arcy, “RE: D’Arcy”, email message to Nancy Custer, January 3, 2006. “Age is calculated from his age of 61 at death on 17th Aug 1881”. He arrived Sydney 18th Feb 1848. He was the only D'Arcy on the ship.
2 Bernie D’Arcy, “RE: D’Arcy”, email message, “He arrived Sydney 18th Feb 1848. He was the only D'Arcy on the ship.”
3 Wayne and Maureen Hannah, The Descendants of John Dorsey, Civil War Soldier, (Shelton, WA: privately published, 1996) p 3.
4 Whit Athey, “STR Allele Frequencies for Haplogroup R1b” http://www.worldfamilies.net/Super%20Western%20Atlantic%20Modal%20Haplotype.htm accessed February 22, 2006.
5 Whit Athey, “STR Allele Frequencies for Haplogroup R1b.”.
6 Whit Athey, “STR Allele Frequencies for Haplogroup R1b.”
7 Wayne and Maureen Hannah, July 2003, personal communication to Nancy Custer.
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