Tuesday, December 20, 2016

The Halves & The Halve Nots


The “halves” and “halve nots" – didn’t you mean “haves” and “have nots?” No, I meant what I said and here’s why. While it is generally accepted that the amount of shared autosomal DNA roughly halves with each generation, is this conclusive when we are discussing relationships at a variety of levels? In looking at my own family, I wanted to see if there were any discernible patterns in the amount of DNA shared with a relative when compared to two generations of a family, viz. a parent and a child.

METHOD

To do this, I analyzed 630 relationships from my family that included the amount of shared centimorgans of autosomal DNA. This required looking at shared DNA between two parties and the child of one of the parties. Only autosomes were used in the calculations and the X chromosome was ignored. The age span of the participants ranged to nearly 98 years with the oldest participant having been born in 1918, while the youngest was born in 2016. Two of the participants are deceased. There were 20 parent/child pairs:

  • Seven mother/son pairs.
  • Six father/daughter pairs.
  • Five father/son pairs.
  • Two mother/daughter pairs.

The results were compiled from a variety of relationships that included 33 participants in total. The relationships spanned parent/child to fourth cousins, twice removed. Tests were primarily from 23andMe and FTDNA with one at Ancestry. To be consistent, the data for matching shares in centimorgans were only gathered through GEDMatch.com. In addition, relationships that included fully identical segments were omitted (affecting only 8 full sibling relationships).

Additional relationships (several) where there was no matching DNA to a parent in the study were ignored. A number of relationships found only on 23andMe and Ancestry, although close, were not included, as they did not have GEDMatch accounts.   

All 630 relationships in this analysis were confirmed by other evidence and no speculative connections were included. The relationships were grouped according to degrees of DNA sharing. Not all possible relationships were present and only those in the study are listed below:

  • Degree 1: Parent and Child.
  • Degree 2: Half sibling, Grandparent, Grandchild, Aunt/Uncle, and Niece/Nephew.
  • Degree 3: Half Aunt/Uncle, Half Niece/Nephew, First Cousin, Great Grandparent, Great Grandchild, Great Aunt/Uncle, and Great Niece/Nephew.
  • Degree 4: First Cousin, Once Removed and Half Cousin.
  • Degree 5: Half Cousin, Once Removed; Second Cousin; and First Cousin, Twice Removed.
  • Degree 6: Half Cousin, Twice Removed and Second Cousin, Once Removed.
  • Degree 7: Second Cousin, Twice Removed and Third Cousin.
  • Degree 8: Third Cousin, Once Removed.
  • Degree 9: Third Cousin, Twice Removed and Fourth Cousin.
  • Degree 10: Third Cousin, Thrice Removed and Fourth Cousin, Once Removed.
  • Degree 11: Fourth Cousin, Twice Removed.

The goal was to analyze the percentage of DNA passed from parent to child. In addition, the child’s match with the relative was compared with the segments shared with the parent in question. In one situation, a child had matching DNA with a fourth cousin, once removed that was transmitted from his mother and not his father – the parent with the confirmed fourth cousin relationship. The relationship with the mother is unknown. This data was not included.

We also had thirty comparisons where there were two shared recent ancestral connections. The nearest relationship was that of second cousins who were also second cousins, once removed. These results were listed under the closest degree level. The relatives of those having fully identical segments died prior to advent of autosomal DNA testing – only half identical segments were present.

RESULTS

The degrees of sharing and their statistical data are included the following table:

Parent/ChildPairsMeanMedianStd Dev
Degrees 1/21650.90%51.79%5.82
Degrees 2/36548.38%48.59%6.78
Degrees 3/46349.81%49.72%8.97
Degrees 4/54049.65%46.86%11.89
Degrees 5/63648.20%50.45%11.51
Degrees 6/72050.39%52.26%22.37
Sub Total of Above24049.28%48.69%10.88
Degrees 7/81235.96%32.57%28.13
Degrees 8/92251.28%59.59%32.46
Degrees 9/103635.77%0.00%41.84
Degrees 10/11560.00%100.00%54.77
Total of All31547.53%48.48%21.18

Initially, I only looked at 480 relationships where all parent and child relationships (Degrees 1/2 to Degrees 6/7) exhibited shared DNA with the relatives in question. This produced 240 data points. For Degrees 1/2 to Degrees 6/7, 77% of the results fell within one standard deviation. A typical bell curve would have 68.2% of the results within ±1 σ.


Removing the outliers with the interquartile range, the mid results of the original 240 pairs skewed to the left of the mean as demonstrated in the chart below.


An additional 150 relationships, representing Degrees 7/8 through Degrees 10/11, were added. The only caveat for inclusion was that the parent had to match the relative in question – but the child did not need to have matching DNA to the parent’s matching relative. Of the 75 parent/child pairs that were included, 28 children failed to match the relative in question at levels of 5cM or higher. These 0.00% shares were included in the overall results.

The children’s non-matching data were so pronounced in Degrees 9/10 that the median score was 0.00%. Only 47.22% of the children at this degree level shared DNA with the said relative. The parents were either third cousins, twice removed or fourth cousins and the children were either third cousins, thrice removed or fourth cousins, once removed.

At the Degree 10/11 level, the children either matched the parent’s share at 100% or not at all – indicating an all or nothing proposition as we moved to more distant relationships. Unfortunately, only five pairs were included – which is too small to make a critical analysis.

As we moved further away from a Degree 2 relationship on the part of the child, the standard deviations increased. In other words, as the relationships grew further distant, there was a larger corresponding spread of the results. With the greater the relationship distance, the results were more heterogeneous. In most cases, the SD increased with each generational degree. The only exception was at Degrees 5/6. With a SD of 11.51, it was slightly narrower than Degrees 4/5 at 11.89.

 
With this said, many of the degrees of DNA sharing exhibited means very close to 50%. The only variations were found in Degrees 7/8 at 35.96%, Degrees 9/10 at 35.77%, and Degrees 10/11 at 60% (3 of the 5 were at 100% and 2 were at 0% shared). Both Degrees 9/10 and 10/11 had examples of all or none of the relational DNA passed from parent to child.

CONCLUSION

The conclusions are not beyond what we’ve already known about the percentage of shared DNA passed from parent to child. Up through Degrees 6/7, the shared DNA is generally within one standard deviation from the means, which are approximately 50% of the share of the parent. As these relationships become further distant, the spread of one standard deviation increases in size.

As we enter the realm of Degrees 7/8 and further distant relationships, we begin to see the phenomenon of none of the parent’s shared DNA with a relative being represented in the child’s results. With Degrees 9/10, many (but not all) of the results exhibited 0% or 100% shared DNA. At Degrees 10/11, it was either all or none proposition. It is to be noted at this level, the shared segments were between 5cM and 10cM. Since we have three generations that can be tracked lineally with these specific relationships, these segments are identical by descent (IBD), as they can be traced back to the grandparent’s much larger segment at the same position.

The rule of thumb is as follows: the closer the relationship, we are generally “the halves” – at least within one standard deviation of the half share. As for more distant relationships, it is likely we will be “halves not” – perhaps, all or nothing.

LIMITATIONS

While 630 relationships may appear to be a large number, a desired number of at least 768 (384 pairs) would provide the minimum necessary sample size with a confidence level of 95% with a 5% margin of error. As with all statistical measures, a larger sample influences a greater confidence level and a diminished margin of error. A sample size exceeding 384 parent/child pairs would be greatly desired.

A second limitation is that this study is largely represented (but not totally) by the descendants of one ancestral couple. The results include those of the ancestral mother who had tested prior to her death in 2016 and includes three generations of her progeny.  Only one of her descendants failed to participate.  In all cases, the participants (including relatives not descended from this couple) have ancestries from Northern and Western Europe. A more diverse population might provide different results.

Monday, July 25, 2016

Are 111 Marker Tests Better at Predicting Relationships? A Case Study Perspective.

I have updated this post on July 28, 2016. 
The new sections are added in red.

Two years ago, I looked at whether Y-DNA genetic distance was an adequate predictor of relationships. Using a number of participants at both 37 and 43 markers, I concluded that genetic distance was an insufficient predictor of relationship range. This post examines the following question: “Would an STR marker test at 111 markers enhance the ability to predict relationships?”

In the past two years, the Owston/Ouston DNA project has had the opportunity to upgrade fifteen men to 111 markers. At this resolution, our 15 project members only have matches within our surname group, which indicates it is a sufficient tool to narrow the results to a particular family group. By comparison, each of us matched several men with a number of surnames at 67 markers. At 37 markers, we matched nearly 400 men with different surnames.

Although I previously stated that the 111 test had been sufficient enough to separate the wheat from the chaff in our one-name project, I failed to take into consideration that a number of individuals may have not upgraded to 111 markers. Thanks to John Lisle who encouraged me to assess this particular statement, as only two of the 11 non-Owston/ Ouston matches at 67 markers had upgraded to 111.

Our 15 subjects represent three families of a low-frequency surname group that totals an estimated 296 males. These 296 men and boys, yes I counted them, have residence in the UK, the USA, Australia, Canada, New Zealand, Finland, and France. Testing subjects represent all the aforementioned countries except France; however, the son of the lone Frenchman, who lives in England, has tested. A brief synopsis on these families is found below; they are designated by their location of origin. Charts indicating all extant lines and participants can be found at http://www.owston.com/DNA/Charts.pdf.

SHERBURN FAMILY

The largest Owston/Ouston family hails originally from Sherburn in Hartford Lythe, North Yorkshire and its many members descend from Peter Owston who died in Sherburn in 1568. This group also includes individuals with Ouston surname variation who descend from James Ouston (1711-1785). The Sherburn family’s most recent common ancestor, William Owston, was alive in the 1550s and died in 1602. Seventy percent of all Owston/Ouston males descend from this family. The most distant relationship within the Sherburn family is that of 13th cousins.

A total of 19 men from the Sherburn family have tested: six exhibited ancestral non-paternity events, two remain to be upgraded from 43 markers, and 11 have been tested at 111 markers. Of those 11 subjects, the relationships range from siblings to 11th cousins, once removed.

The Sherburn family includes the Cobourg line, which descends from William Owston 1778-1857, and is named for the Canadian town near where the family located in the 1830s. While William lived in numerous locations in England, Scotland, Ireland, and Canada, he and his family lived the longest in Hamilton Township, which surrounds the Town of Cobourg, Ontario.

William was placed within the Sherburn line due to circumstantial evidence that led to this conclusion. Of the seven William Owstons born within a 10-year tolerance of his birth date, William Owston of Ganton, the son of Thomas Owston of Sherburn, met several criteria (birth date, birth region, and father’s name) to be considered likely to be one and the same as William Owston of the Cobourg line.

This particular line is well represented in the project with seven Y-DNA participants – six at the 111 level. The most distant relationship represented is that of fourth cousins, once removed. The most distant relationship among all males of this line is at the sixth cousin level. A total of 22 Owston and non-Owston relatives in the Cobourg line have also participated in autosomal testing. This is the author’s line and the reason for its overrepresentation was convenience sampling.

The abbreviated chart below shows the relationship of the Sherburn (and Cobourg) descendants who have upgraded to 111 markers. 

GANTON FAMILY

The second largest group of Owstons originated in the village of Ganton, which is located five miles east of Sherburn in North Yorkshire. Descent can be satisfactorily traced to Giles Owston who died in 1641. While an older connection cannot be firmly established, this family is probably descended from John Owston who was alive circa 1490 in nearby Staxton in Willerby. This supposition occurs because several unique first names exist in both lineages. While a few Ganton Owstons live in the UK, the majority of Owstons in the US are from this family. All surviving Ganton Owstons descend from Thomas Owston (1755-1823). The Ganton family represents 21% of living Owston males.

A total of four men from the Ganton family have tested; however, two were tested at 43 markers, but died before upgrading at FTNDA. The remaining two, who have tested at 111 markers, are fifth cousins. The family’s most distant relationship is that of seventh cousins.

The following chart shows the relationship of the two Ganton participants who have tested at 111 markers. 

THORNHOLME FAMILY

Finally, a third group of Owstons from 15 miles south of Sherburn and Ganton can be traced to Richard Owston of the village of Thornholme in the parish of Burton Agnes, East Riding of Yorkshire. Richard Owston died in 1739. By using onomastic evidence, it is possible to theorize a connection to an earlier Ganton line fathered by Robert Owston who was born as recent as 1580. The Thornholme Owstons constitute the largest group of Owstons/Oustons in Canada.

A total of five men from the Thornholme family have tested and all four extant lines are represented in our project. Two men exhibited ancestral non-paternity events, one has not yet upgraded from 43 markers, and the remaining two have tested at 111 markers. These two individuals are seventh cousins once removed.

Being the smallest of the three families, the Thornholme family has only 25 males, which constitutes 9% of the total number of Owston/Ouston males. The most distant relationship found within the Thornholme family is that of 9th cousins. The following chart details the relationships of the two Thornholme family members who have tested at 111 markers.


INTERFAMILY RELATIONSHIPS

Data for this one-name study comes from the individual and combined research of Timothy J. Owston, Roger J. Ouston, and James M. Owston. While each began researching the surname in the 1970s, their combined efforts began in 1990 when they crossed research paths.

As noted, a total of 15 men have tested at 111 markers; this represents 105 relationships. While intrafamily relationships are easily tracked, the difficulty arises in cross-family relationships, as records prior to 1550 are spotty. Matching Y-DNA has confirmed that the three families are related and they are from the same region; however, documentation on connections among the three families does not appear to exist.

To address the interfamily relationship problem, I have created a plausible tree based on naming conventions from the three current families and two extinct families who have originated in the Vale of Pickering that spans the historic border of the former North and East Ridings of Yorkshire. The first reference of the surname in this region appeared in 1452. I am confident that the relationships of these lines are within two generations (further distant) than I’ve charted. For this analysis, I used the closest possible relationship that could be presumed.

RELATIONSHIPS

The following charts and table enumerate the known (and assumed) relationships in this family.

Click image for a larger version.


RelationshipsNumber
 Brothers1
 Uncle/Nephew2
 2nd Cousins2
 2nd Cousins, Once Removed1
 4th Cousins7
 4th Cousins, Once Removed3
 5th Cousins1
 7th Cousins, Once Removed1
 8th Cousins5
 8th Cousins, Once Removed8
 8th Cousins, Twice Removed2
 9th Cousins6
 9th Cousins, Once Removed7
 9th Cousins, Thrice Removed 1
 10th Cousins1
 10th Cousins, Twice Removed7
 11th Cousins, Once Removed2
 12th Cousins3
 12th Cousins, Once Removed8
 12th Cousins, Twice Removed6
 12th Cousins, Thrice Removed1
 13th Cousins7
 13th Cousins, Once Removed16
 13th Cousins, Twice Removed1
 14th Cousins4
 14th Cousins, Once Removed2

Click image for a larger version.

RESULTS

By comparing the results of 15 subjects at 111 markers and the additional five participants at 43 markers, a modal haplotype has been constructed. Three participants shared the modal signature at 111 markers: Ganton03, Ganton04, and Cobourg08. The late Ganton01 also exhibited the modal haplotype at 43 markers. Several others who shared the modal haplotype at 37 and 43 markers did not at 111 markers.

There was a noted convergence with Cobourg08 who had a back mutation on DYS643 to 12 repeats, which was found in the modal haplotype. All of the other matching Cobourg line members have an 11 at this marker. This back mutation attributed to some of the outlying results in this analysis. The genetic distance (GD) for the 105 relationships at a 111 marker resolution ranges from 0-9. A GD of 2, however, was not recorded for any of the relationships.

Click image for a larger version.
  
The following table delineates the generational range, mean, the adjusted mean relationship, and the standard deviation for the results.

GDMIN
TMRCA
MAX
TMRCA
MEAN
TMRCA
ADJUSTED MEAN
RELATIONSHIP
STANDARD
DEVIATION
0114.56.06  5th Cousins        5.15
151511.4610th Cousins, Once Removed        4.68
3315.510.60  9th Cousins, Once Removed        4.88
4514.512.4811th Cousins, Once Removed        2.34
55.514.511.6810th Cousins, Once Removed        2.71
691510.53  9th Cousins, Once Removed        1.99
79.515.512.5011th Cousins, Once Removed        2.17
811.51412.8312th Cousins        0.98
99.51310.38  9th Cousins, Once Removed        1.80


Outside of a GD=0, the adjusted mean relationship for genetic distances of 1 to 9 ranges from ninth cousins, once removed to 12th cousins. The plot below provides a visual representation of the interquartile range and the outliers based on genetic distance (GD) and the time to the most recent common ancestor (TMRCA).

ANALYSIS

Largely due to two outlying relationships because of convergence and three very close relationships in the Cobourg line, those sharing a GD=0 have the greatest standard deviation (SD) of 5.15 generations. GD=1 and GD=3 are not far behind with standard deviations of 4.68 and 4.88 generations respectively. The relationships that are represented by these three genetic distances (0, 1, & 3) are more heterogeneous. This heterogeneity indicates that relationships at these levels are likely to be more different than similar.

Contrariwise, those with a greater genetic distance have a lower SD and are more likely to be similar in relationship. With a genetic distance of four through nine, the SD ranges from .98 to 2.71 generations. The most homogenous group is GD=8 with the lowest SD of 0.98 generations. Therefore, it appears that the greater genetic distance, relationships become slightly more predictable at least within our surname.

CONCLUSION

While 111 markers aided in fine tuning our connectivity to those sharing our genetic and genealogical roots, genetic distance was not an accurate predictor of most relationships. Outliers can and do happen, as experienced with a GD=0; however, 78% of the participants at a GD=0 fell within the predicted level of six generations or less with a p ≤  .01, Two did not, and as explained earlier, this was due to convergence. We have seen close relatives (5th cousins and closer) having genetic distances up to 5, while 13th cousins, once removed have a GD=0.

The caveat is that this is one family of meager size from one haplogroup I-M253 (fine tuned with SNP testing to I-A10207). It may not be representative of everyone’s experiences; however, this information can be used as a reminder to exercise caution in using genetic distance as an indication that someone is more closely or more distantly related than he actually is. A prediction based on genetic distance alone might just be wrong.

EPILOGUE

The move to 111 markers questioned our genealogical research methods, as all but one Cobourg line participant matched members of the Ganton family at 110 or 111 markers; Cobourg06 had more mismatches with most participants including his own family. In addition, matches between Cobourg participants and their Sherburn cousins were more distant. In fact, the closest related Sherburn family member matched most Cobourg members at 105/111. Matches between Cobourg and Thornholme families were distant as well. I questioned, “Did we place the Cobourg line in the wrong family?”

By analyzing the parish registers once more, we confirmed our original decision that the Cobourg line was a subset of the Sherburn family. Still, we wanted confirmation. In effort to be frugal, we decided to first test Ganton03, Ganton04, and Sherburn08 autosomally and hoped that at least one of the 22 Cobourg line members matched someone. While autosomal testing is generally reliable for up to five generations, this move was a gamble, as the new participants were related to the Cobourg line beyond that level in any scenario. Knowing this, we forged ahead and none of the three new autosomal subjects matched anyone. The two Ganton family matches, who were fifth cousins, even failed to match one another.

The next step was to utilize FTDNA’s BigY test and to contract with YFull for an analysis of the results. We originally tested Cobourg01, Ganton04, and Sherburn08 (Cobourg01’s closest related Sherburn family member). When funds were available, we added a Thornholme family participant. The results were surprising.

It has been suggested that SNP testing is a more accurate predictor; however, testing these four Owston/Ouston family members with the BigY has created more questions, as the results suggested a heretofore unforeseen and unpredictable scenario. Let me explain. 

I anticipated that Cobourg01 would closely match either Sherburn08 or Ganton04. I also assumed that Sherburn08, Ganton04, and Thornholme04 would match, but have some differences. If any of those three should have had closer matches, it would have been Ganton04 and Thornholme04, as onomastic evidence suggests that these two families are more closely related.

To summarize, we have three distinct families: Sherburn, Ganton, and Thornholme. Remember that STR results at 111 markers were the closest between the Cobourg line and the Ganton family, but parish registers indicated that the Cobourg line was part of the Sherburn family. However, there still was an outside chance that the Cobourg line could rather be attached to the Ganton family rather than to the Sherburn family. While all four had novel SNPs, they all had 16 new SNPs that matched. But differences arose in two SNPs.

Ganton04 and Sherburn08 tested positive with A10216, while Cobourg01 and Thornholme04 were negative. In addition, Cobourg01 and Thornholme04 were positive for Y22277; however, Ganton04 and Sherburn08 had no calls. A conclusion cannot be made regarding Y22277; however, A10216 placed Ganton04 and Sherburn08 downstream from Cobourg01 and Thornholme04’s A10207 terminal SNP.

With these results, Ganton04 and Sherburn08 were exact matches and Cobourg01 and Thornholme04  were exact matches. As a researcher who has devoted the last 38 years to primarily studying one surname, this created cognitive dissonance. What happened? Here are some possibilities that are listed in no particular order.

  1. The Cobourg family is actually descended from a heretofore unknown William Owston from the Thornholme family who was born in February 1778 in Yorkshire and who likely had a father named Thomas.This appears to be the logical conclusion, but we have yet to find this William Owston. In addition, the Thornholme family must be more distantly related to the Ganton family than we had previously predicted. It is doubtful any genealogical records exist to confirm or refute this.

  2. The A10216 SNP results shared by Ganton04 and Sherburn08 were examples of convergence. I’ve been told that this doesn’t happen with SNPs, but do we really know that?

  3. At least Cobourg01 and perhaps Thornholme04 had back mutations on A10216. I’ve also been told this doesn’t happen, but could this be possible?

  4. There were issues with the BigY BAM files from FTDNA or with the analysis from YFull. Anything is possible.
This creates a big mystery that impacts decades of research, and hopefully we’ll be able to confirm this anomaly in the near future. If the Cobourg line is from the Thornholme family and not Sherburn family, the results suggesting that genetic distance at 111 markers is not an adequate predictor of relationships still holds and makes the case even stronger as the Cobourg and Thornholme Owstons have a greater genetic distance. 

In any case, more research needs to be conducted. We’ve already upgraded Thornhole04 with an autosomal test and results should be in within a week. This is a gamble as the results may be inconclusive. Our plan is to also bring on several more participants for the BigY; but due to pricing, we will wait for sales to occur.

I hope these additions make some of my previous statements a bit clearer and my cognitive dissonance over the BigY results understandable. Thanks.

Friday, June 10, 2016

Exogenous Ancestry – Proposing a Replacement for NPE


If I were genetic genealogy king for a day, I would replace the term “Non-Paternity Event (NPE)” with a more comprehensive term – specifically, “Exogenous Ancestry.”

Exogenous ancestry? That’s a mouthful, but what does it mean?  Well, it’s a term that I have borrowed from biological studies to explain some of the discontinuity of single source surnames with Y-DNA from outside of the family in question.  I have been contemplating for some time of using a different term from what is now commonly used in genetic genealogy – non-paternity event (NPE).

Bryan Sykes and Catherine Irven (2000) first used non-paternity event in the context of genetic genealogy to explain haplotypes that differed from the typical Y-DNA signature of a surname.  It was a borrowed term as well, as it was used in anthropology and sociology where the presumed father was not the father of a child.  Generally, this referred to infidelity on the part of the mother. 

In genetic genealogy circles, the International Society of Genetic Genealogy’s Wiki cites least 13 different categories which have been considered as non-paternity events.  While infidelity is one of these, there are other scenarios where genetic genealogists have used this moniker to describe the discontinuity between surnames and ancestry.  

What's the Beef?

The term non-paternity event and its synonyms don’t neatly fit every situation where it is used.  It assumes that the designated father (and even the child) is unaware of the child's ancestry.  This is not always the case. 

In some cases, there may not be a father in the picture and the surname traveled from mother to child.  The birth father’s name was not associated with the child and there was no “official” father from whom false paternity could be claimed.  It wouldn’t be a surname discontinuity as it continued from the mother; it would be a Y-DNA discontinuity.

In the case of complete adoptions, not only would the paternity be different, but the maternity would be as well.  Using a term such as “Exogenous Ancestry” would better fit full adoption circumstances as not only is the paternal DNA different, so is the maternal DNA.  This term would be applicable to discontinuities found in mitochondrial and autosomal DNA. 

Name changes are often considered NPEs – however, these can be voluntary and NPE doesn’t fit the situation – I am not sure any term other than “name change” would fit this scenario.

Finally, the term appears to pinpoint a given “event”; however, we may not be able to identify a specific generation when this discontinuity occurred.  While a person’s recorded ancestry may have confirmation going back several centuries, Y-DNA tells a different story.  Yes, there was some sort of misattributed paternity, but where did this “event” occur in the lineage?  Can we find it – sometimes, but not always.  We know that somewhere along the ancestral line exogenous DNA entered the picture. 

Where did this Term, Exogenous Ancestry, Originate?

It isn’t an original term, although I have been sparingly using “exogenous Y-DNA” since 2012 to soften the blow when reporting NPEs in my study. While recently performing Google searches for terminology relating to DNA from outside the family/clan/tribe, I found it used in the study of wolf and coyote populations of North America. 

Lupine biologists used it to describe DNA found in certain wolf populations that originated from outside the pack – sometimes considered an unusual occurrence.  In addition, it was also used when wolf DNA was present in populations of coyotes – especially in areas where no known wolf populations existed – hence an ancestral occurrence (von Holt, Kays, Pollinger, & Wayne, 2016).

Exogenous ancestry is broader term than non-paternity events, it is already used in mammalian DNA studies, and it is a better fit to a variety of DNA discontinuities. Will it gain in popularity?  I hope, but sometimes teaching an old dog, wolf, or coyote new tricks isn’t that easy.  I would be interested in hearing your spin on this term.

Sources

Non-Paternity Event (n.d.). International Society of Genetic Genealogy Wiki. Retrieved June 10, 2016 from http://isogg.org/wiki/Non-paternity_event

Sykes, B., & Irven, C. (2000). Surnames and the Y chromosome.  The American Journal of Human Genetics, 66(4), 1417-1419. doi:10.1086/302850

von Holt, B. M., Kays, R., Pollinger, J. P., & Wayne, R. K. (2016). Admixture mapping identifies introgressed genomic regions in North American canids. Molecular Ecology, 25(11), 2443-2453.  doi:10.1111/mec.13667

Friday, February 12, 2016

He Inspired a Genealogist – Mr. George T. Ihnat




Today, I received notification that a teacher I had in junior high school and high school had passed away on Wednesday, February 10, 2016.  I hadn’t seen Mr. George T. Ihnat since the day I graduated in June 1973; however, he had a profound effect on me by instilling a love for family history.
 
George T. Ihnat in 1972
Beginning in 1967, I attended Park Terrace Junior High School in North Versailles, PA – where we moved from teacher to teacher instead of having one teacher all day.  I barely remember any of my instructors from Park Terrace, as there were so many – but one who made a lasting impression was Mr. George T. Ihnat who taught 8th grade English. I would later have him as my 11th grade American literature instructor at East Allegheny High School.
 
As I had many great teachers during my life, I can’t say I remember the specifics of the vast amounts of knowledge he imparted in either class; however, I do recall an assignment that had influenced my primary life’s interest.  One day in 1968, Mr. Ihnat assigned us a project to create a family tree – a typical project that occurs during many people’s school experiences.  I hadn’t thought about my ancestry until then and I haven’t looked back.
 
The assignment prompted me to ask my mother about her and my dad’s families.  Since my dad had passed away in 1962, I knew very little concerning my paternal lineage.  Mom knew my dad’s mother’s family, but only my grandfather’s name and a few scattered details about his siblings. She went into her secretary and pulled out a piece of folded paper in my father’s handwriting that had the names and dates of my father’s grandparents. He had jotted down these notes after visiting relatives in Ohio during the summer of 1960. She also found an old obituary about my great-great grandmother, Sarah Ann Jones Merriman, who was the oldest woman in McKeesport, PA at the time of her death in 1929.

Later that day, my mom and I went to McKeesport-Versailles Cemetery and found Sarah Merriman's and my second great grandfather’s grave – John Merriman was a Civil War veteran in the 101st Pennsylvania Volunteers. My research also inspired me to query my only living grandparent – my mother’s mother about her lineage. I was given a wealth of information about her and my grandfather’s sides of the family.

I also asked my Aunt Nath, my dad’s oldest half-sister who attended the same church as us, if she could provide some additional information. She gladly wrote down names of family members that she could remember. That was a little over 47 years ago and I still have all of these notes and clippings. It got me interested in family history and this was later rekindled in 1978 with the return of my great-grandparents’ family bible to its bloodline.


Mr. Ihnat’s assignment continues to inspire me even to this day in discovering family – old and new. This interest has expanded from archives, library, and cemetery research to DNA testing of relatives – a keen hobby thanks to an English teacher who went beyond the scope of grammar and composition with an assignment about a family tree.
 
Mr. Ihnat:  I am sorry that I never connected with your during my adult years to tell you how that one assignment changed my life forever. Thanks to you it did. While I am hard pressed to remember any of my junior high teachers, you’ll never be forgotten. Rest in Peace.