tag:blogger.com,1999:blog-5946578971422285697.post3720763998464390731..comments2023-10-29T05:54:30.033-04:00Comments on The Lineal Arboretum: Phasing the X-ChromosomeJim Owstonhttp://www.blogger.com/profile/13489905161227202406noreply@blogger.comBlogger17125tag:blogger.com,1999:blog-5946578971422285697.post-42958036896539718352018-01-01T15:05:57.790-05:002018-01-01T15:05:57.790-05:00Glynnis: Sorry about that. I don't get notice...Glynnis: Sorry about that. I don't get notices when someone posts a response to this blog. Please email me at james.m.owston@gmail.com if you have questions. I have not found out anything more regarding the X chromosome in my family. Jim Owstonhttps://www.blogger.com/profile/13489905161227202406noreply@blogger.comtag:blogger.com,1999:blog-5946578971422285697.post-61207562122291097702017-09-04T07:34:18.942-04:002017-09-04T07:34:18.942-04:00Hey Alica MJ,
I wonder if you've found out any...Hey Alica MJ,<br />I wonder if you've found out anything more since posting? I have so many questions for this guy who wrote the blog, but he doesn't seem to have answered any comments since last July! Sadly!<br />Thanks, Glynis Anonymoushttps://www.blogger.com/profile/14983929339243725140noreply@blogger.comtag:blogger.com,1999:blog-5946578971422285697.post-75399671758887671092017-05-22T20:47:37.121-04:002017-05-22T20:47:37.121-04:00I so just lied, I was counting the wrong Report, F...I so just lied, I was counting the wrong Report, Feeling Dumb...But, I had 56 matches and of those matches on the "X" about 1/2 men and 1/2 woman and the men that fell on my other Chr was 14 out of the 56..Sorry for the HUGE mistake in numbers, however, this is right this time...Geese! I am sure everyone got a giggle out that...ooops...Anonymoushttps://www.blogger.com/profile/02891607776620969839noreply@blogger.comtag:blogger.com,1999:blog-5946578971422285697.post-31090940238820699692017-05-22T20:38:00.926-04:002017-05-22T20:38:00.926-04:00Jim, I love that you related all to your experienc...Jim, I love that you related all to your experience with your family & findings and shared this helpful research to help us. Very cool of you and appreciated. <br /><br />I am new to all of this, however, I have read all I can get my hands on, talked to several found relatives but, I am still unclear on the "X" factor. <br /><br />I am a female. I was adopted at birth, but, I have located my Maternal line and there are 4 of us that are 1/2 siblings that tested DNA.<br /><br />We all have different fathers, and all I can seem to really locate is my Maternal side. On 23andme the 1st 240 names came up matching a sibling of mine too. I since have joined Gedmatch and all the biggies. <br /><br />My question I can not seem to find a answer to is this: I have on My "X" With Gedmatch 64 relatives out of them I have 2000 matches on my "X"????<br /><br />Out of the 2000 80ish are men??? I am looking for my Paternal family line, Should I focus on the men on my "X" or closest Atdna? If from what you are saying is the rule and men only get appox 3 matches on the "X" should I be looking there? If so, what am I looking for that would stand out on a hit with a paternal male?<br /><br />Also out of the 80 males that I had a match on the "X" with only 14 of the 80 shared any other DNA with me and fell on other Chr markers. what is your advice ?<br /><br />Can the "x" help me find a paternal line and if so how should I go about figuring that out? <br /><br />I more then I can tell you would appreciate any insider info on this question...Thank you! AliciaAnonymoushttps://www.blogger.com/profile/02891607776620969839noreply@blogger.comtag:blogger.com,1999:blog-5946578971422285697.post-90277145800981408352016-07-26T00:39:59.468-04:002016-07-26T00:39:59.468-04:00Peter: I just saw your comment. If you have femal...Peter: I just saw your comment. If you have female first cousins from a maternal uncle, this could aid in phasing your X chromosome. I was in the same boat with my oldest brother, as we shared so little. JimJim Owstonhttps://www.blogger.com/profile/13489905161227202406noreply@blogger.comtag:blogger.com,1999:blog-5946578971422285697.post-86430688459446090832016-05-18T09:58:47.284-04:002016-05-18T09:58:47.284-04:00Jim, excellent article - wish I'd read it earl...Jim, excellent article - wish I'd read it earlier, but better late than never!<br /><br />I only have only one brother and we share just 10.7cM on the X chromosome (according to GEDmatch he has about 20 distant cousins who share more of his X-DNA than I do).<br /><br />My guess is that rather than one of us having inherited all of our X-DNA from one maternal grandparent, there is just one crossover point in each X, and the section we share is the segment between the two crossover points. But it is just a guess - as I investigate the matches it should become more obvious.<br /><br />Peter Calverhttps://www.blogger.com/profile/08462356866775326276noreply@blogger.comtag:blogger.com,1999:blog-5946578971422285697.post-24633939460164891782016-05-05T01:10:21.141-04:002016-05-05T01:10:21.141-04:00This article was the easiest to understand regardi...This article was the easiest to understand regarding the X chromosome I have read. Thank you!! I have a match on my X (I am female ), to my female distant cousin, we share my 5th GG and her 3rd GG... We share a solid line of 104cms! We share autosomal, but under 7cms on multiple lines.. Isn't this a tad bit rare..?!. No Ashkenazi that I know of.. MPChttps://www.blogger.com/profile/04966212236158244394noreply@blogger.comtag:blogger.com,1999:blog-5946578971422285697.post-42837576438679031372013-11-13T17:30:41.527-05:002013-11-13T17:30:41.527-05:00LadyBelka1:
Sorry that I didn't see this earl...LadyBelka1:<br /><br />Sorry that I didn't see this earlier. Unfortunately, I am not sure there is any way to consistently assign a MRCA to any X-DNA match. I share only 14.7 cM with my oldest brother. By numbers alone, it would appear that we were probably 4th cousins if there were no other matching autosomal segments. Because of that, it may mean that it is even older. Because X-DNA's transmission from a father to daughter is intact and recombination may be kind to a particular segment, I am not sure there is any sure fire way to predict how distant a match might be. See my chart regarding the ranges and the mean score to see what I mean. Good luck. <br /><br />JimJim Owstonhttps://www.blogger.com/profile/13489905161227202406noreply@blogger.comtag:blogger.com,1999:blog-5946578971422285697.post-91830559729400879092013-10-09T20:28:23.916-04:002013-10-09T20:28:23.916-04:00Hi Jim and thank you for this interesting article....Hi Jim and thank you for this interesting article. <br />I have many X-dna matches where I share about 40-50 cM in total, and the biggest Blocks are about 13 cM. I also match autosomal, but under 7cM. Predicted time to MRCA is about 6-7 gen. Do you think it sounds correct?<br />I also noticed X-matches With a lot of Ashkenazi within the same family, and their clothest autosomal matches, total around 30-40cM, With somebody the longest block 10cM, and she doesn't match my non-Ashkenazi X-matches. I match them also autosomal under 7cM, but 5-6 for the most, MRCA there is shown 7 generations back. Can I say clear about any relation with this family?Anonymoushttps://www.blogger.com/profile/17931446401372785054noreply@blogger.comtag:blogger.com,1999:blog-5946578971422285697.post-31536663169650663122013-08-21T10:38:51.095-04:002013-08-21T10:38:51.095-04:00David:
Sorry, I missed your comment until now. Th...David:<br /><br />Sorry, I missed your comment until now. There are a couple of factors that probably affect the number of matches. <br /><br />1. the unique inheritance of the X limits the number of possible matches. 31.25% of your great grandparents could provide possible matches. If you go back another generation, the percentage drops to 25% of your second great grand parents as possible contributors to the X. The next generation produces only 20% of the possible connections. <br /><br />2. Your X matches are from under representative populations. <br /><br />3. Just not many people who have matched you have tested with 23andMe. <br /><br />Your matches may be pretty distant. By comparison with my family, there are very few X matches as well. <br /><br />JimJim Owstonhttps://www.blogger.com/profile/13489905161227202406noreply@blogger.comtag:blogger.com,1999:blog-5946578971422285697.post-4201178178967084322013-07-29T16:04:22.818-04:002013-07-29T16:04:22.818-04:00Jim,
I am a novice and am trying to educate mysel...Jim,<br /><br />I am a novice and am trying to educate myself on line so as to be better equipped to evaluate my DNA results. After reading your post, which I found very informative, I signe on to gedmatch to look at the XDNA comparisons which heretofor had been ignored. My best match was 22.4 cm and I emailed that person to see if they might share a 6 generation pedigree with me.<br /><br />Getting to the point of my message, I must ask, "Why are all my XDNA matches found at the lowest end of my autosomal DNA matches? I have only 2 or 3 XDNA matches withing the 7 cm cutoff of the autosomal matches.<br /><br />Thanks for all you do,<br /><br />David JohnsonAnonymoushttps://www.blogger.com/profile/14823370253451887355noreply@blogger.comtag:blogger.com,1999:blog-5946578971422285697.post-65031923839476201962013-03-07T18:29:08.304-05:002013-03-07T18:29:08.304-05:00Thanks Bert. Yes, I do believe if you have individ...Thanks Bert. Yes, I do believe if you have individuals sharing both autosomal and X chromosomal markers you could eliminate the ancestries that are non-X contributors. Most of the individuals who match my family members on the X do not share autosomal matches. To me this suggests that X matches may be older than the typical five or six generations that are given for significant autosomal matches. Thanks again. <br /><br />JimJim Owstonhttps://www.blogger.com/profile/13489905161227202406noreply@blogger.comtag:blogger.com,1999:blog-5946578971422285697.post-39270657411622502362013-03-07T16:21:44.545-05:002013-03-07T16:21:44.545-05:00Great Work!
I wonder is it possible to use you...Great Work! <br /><br /> I wonder is it possible to use your X Chromosome data to help classify autosomal DNA segments?<br /> <br />I can go to Gedmatch.com, find matches, then sort by "largest X cM". Next mark the checkboxes for a large group, maybe 40, of your most significant X matches that also share non-zero autosomal matching segment(s). Next scroll back to the top above the matches grid and press the "Chr-Browse" button. With my own kit, I find many small but multiply shared autosomal chromosome segments. <br /><br /> I would hypothisize that those autosomal matching segments which one shares in-common with multiple members of your X-match group probably have shared the same inheritance path as your X chromosome. Do you think this may be true? If so, would you think, given a sufficiently large database, including a sufficient number of close relatives, it may be possible to perform a sort of "X-pattern partial phasing of one's autosomal chromosomes"?Bert Pittmanhttps://www.blogger.com/profile/04254970435276884808noreply@blogger.comtag:blogger.com,1999:blog-5946578971422285697.post-4113903188150746322012-12-22T17:40:03.897-05:002012-12-22T17:40:03.897-05:00Brian: Thanks for your comments. I certainly under...Brian: Thanks for your comments. I certainly understand the limitations. I took on the DNA projects largely on my own and only bought kits during sales. I did a little bit at a time. Unfortunately, I am no longer in the position to be able to do this - so I understand your frustration. I understand the added expense to send kits overseas. There are some ways around this through friends and there is a postal service - the name escapes me - that will handle sending kits without the added expense. I hope this helps. <br /> Jim Owstonhttps://www.blogger.com/profile/13489905161227202406noreply@blogger.comtag:blogger.com,1999:blog-5946578971422285697.post-53982494061311884962012-12-22T03:09:48.442-05:002012-12-22T03:09:48.442-05:00An excellent explanation and I love the colour dia...An excellent explanation and I love the colour diagrams. Easy to see why you have the awards on the left of your website.<br /><br />My only concern is the real practical one of not having enough time or enough money to get into this. I think for over here in the United Kingdom almost all folk will need convincing this may actually tell them something useful in family history research over here as opposed to over there. Intellectually I find it fascinating - but I am not rich enough to indulge. American sponsor needed.Brian Swannhttps://www.blogger.com/profile/15183639886324839008noreply@blogger.comtag:blogger.com,1999:blog-5946578971422285697.post-22820094404121475782012-11-30T17:08:59.341-05:002012-11-30T17:08:59.341-05:00Thanks Jody. It was easy once my cousin, who is my...Thanks Jody. It was easy once my cousin, who is my uncle's daughter, was tested. It was kind of an aha moment when I thought about it. <br /><br />JimJim Owstonhttps://www.blogger.com/profile/13489905161227202406noreply@blogger.comtag:blogger.com,1999:blog-5946578971422285697.post-67799887451496795582012-11-26T23:05:59.007-05:002012-11-26T23:05:59.007-05:00This is a great explanation, Jim. I love the way ...This is a great explanation, Jim. I love the way you were able to assign specific areas of the X chromosome.Jody Lutterhttps://www.blogger.com/profile/01166860142168646494noreply@blogger.com