Archive | 2023

Much Ado About DNA Hacking

Nov8

The recent panic about hacking at 23andme in the press seems overblown to me. What exactly would someone do with my DNA? There is nothing in there of any monetary value nor do I have health risks that need to be private. Perhaps knowing which celebrities are Jewish or Chinese might be of use to some bad actors. The fact is that those lists are for sale on the dark web. Click here for an interesting article about that.
We have all been advised to guard our online privacy but our DNA is not our social security number nor our credit card so I am not worried about this yet. The hackers were able to use login credentials that were leaked from other sites to access those people’s accounts at 23andme. Then they could see information about other 23andme users whose DNA matched the compromised account. The type of information exposed was ethnicity, other relatives, and family tree information, plus whatever you said about yourself. This does not seem worrisome to me. My actual DNA was not exposed and even if it were, it would take a very DNA savvy hacker to use it to create a fake relative of mine.

Most of the DNA sites are now forcing two factor authentication (2FA) on their users when they log in. That is where a text or an email is sent to you when you log in to be sure it is you. This should prevent “credential stuffing” hacks in the future. If you try to log into 23andme, you will also discover that you must now change your password there. If your relative is deceased and their email of record is no longer available you may be out of luck. Perhaps customer service can help you.

Here is the text of the recent email all my Jewish accounts received:

“Specifically, there was unauthorized access to one or more 23andMe accounts that were connected to you through DNA Relatives. As a result, the DNA Relatives profile information you provided in this feature was exposed to the threat actor.”

The moral of this story is not to use the same passwords on more than one site. Several of my favorite passwords were leaked in various hospital system breaches. Google is kind enough to tell me when I try to log in to a site with a compromised password. My recommendation is to use several passwords which you vary by including a 2 or 3 character indicator of the site name.  So for example add “23m” somewhere in your 23 and me password. Most of us have browsers which remember our passwords for us and if they forget, we can use the forgot password link or have the site text us a code. I keep a text file of my passwords with written descriptions of which password used rather than spelling them out. Naturally I use unique, different, and difficult passwords with 2 factor security on sites that access money.

Personally, I am not leaving 23andme although I did change my password there. I am sad that many of the features that I love, like the DNA comparison tools, are temporarily closed down. I look forward to their return once the breach has been understood and dealt with.

BigY700 and the Search for my paternal line

Aug22

My Dad’s Norwegian great great grandfather, Lars Monsen, was originally from the Bergen area we had been told. He left his ship to marry a girl from Farsund and then settled in Kristiansand. My cousin Dick and I tried to find records about him, but this name was quite common in Hordaland (think Tom Smith). There were 10 candidates for our Lars in the Bergen area, so I used Y DNA testing to figure out which one he was. This is discussed in several previous blog posts (click here and here)

Kristiansand Boat Basin 2015

Sigmund, a friend in Norway, found a paternal line descendant of Ole Monsen Åstveit, my suspected 5rh grandfather. Then Sigmund sent him a Y 37 marker test from Family Tree DNA. This cousin, Einar, and my father subsequently matched at 3 steps, meaning there were three STR markers that were different. Since the common ancestors lived in the 1700s this seemed reasonable, especially after I looked at each of the markers and found them to be faster mutators (click here for that article). On the other hand, my second cousin, also in the R1b haplogroup, matches a 5th cousin of his, descended from an ancestor in the 1600s, at zero steps. Basically any match in the 0-3 range is usually recent enough for the genealogies to line up.

For Christmas this past year, I gave myself the gift of upgrading Einar’s Y STR test to the BigY700 at Family Tree DNA. I had long since upgraded my Dad and that upgrade included more STR markers. For more about the different Y tests try my article Why Y? (irresistible title!) which has links to more resources as well. This upgrade also took Einar’s STR test from 37 markers to 111. Imagine my surprise when I found that at 111 markers they still had only a 3 step difference!

However the purpose of the BigY700 is to look at SNPs rather than the STRs. The SNPs will tell you more about your deeper paternal line ancestry. It is also a good way to confirm a STR match. Another reason to do the big Y is that when you have an active project administrator, you will be able to see the bigger patterns and branches of your section of the Y tree. There are projects for specific surnames as well as for regions and haplogroups and subsets of haplogroups. You can join projects at Family Tree DNA from your dashboard by clicking Group Projects then Join a Project, as shown below.

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Don’t be Fooled by Ethnicity

May30

Many people who see that their ethnicity estimate from a DNA test is way off, think that they cannot trust the other findings from that testing company. That is a false assumption.

When you are shown people who share DNA with you, aka DNA matches, they really are your relatives, although some can be quite distant. What the relationship actually is may not be predicted very accurately, as many relationships share similar amounts of DNA. Examples of that are a grandparent and an aunt or a 2nd cousin and a first cousin once removed. Thus you are usually shown a range of possible relationships. Figuring it out from shared matches and trees can be lots of fun!

Recently “Gail,” a DNA match to my South African 3rd cousin Sharon, contacted me. The only common ethnicity that was shown for them at their testing company was Ashkenazi Jewish. Thus she was assuming that their common ancestors were Jewish.

However the problem is that Gail inherited her 2.7% Jewish from her mother who does not match Sharon. Gail has no Jewish on her father’s side that she knows of. My cousin’s 28% Jewish is from her maternal grandmother. That is the line where Sharon matches me (click here for that story). Gail does not match any other of my many many tested family members on that line.

One of the issues that people of Northern European descent have is that our ancestors intermingled quite a bit. This means that your Scandinavian could be my English and I suspect that is the case here. Another problem is that unlike relative matching, predicting your biological ancestry from your DNA is far from an accurate science (click here for my most recent article of many on that subject)

More accurate than ethnicity are the shared relatives. When looking at the matches Sharon and Gail share, I found a set of common ancestors among them that are from a non Jewish South African line.

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Make Ancestry Find the Relationship

Apr23

Did you know that Ancestry can figure out how you are related to a DNA match if you both have trees linked to your DNA tests? You do not have to have anyone further back than your parents if other relatives have more extensive trees on Ancestry that include your family,

So how do you link your tree to your DNA? First log into Ancestry.com. Then click on DNA Result Summary in the pull down menu under DNA. Next click the gear on the far right that says Settings next to it as shown in the image below.

Once you are on the Settings page, scroll down to the words DNA and family tree linking.​ Then click that box to get to the page where you can link your test to your tree.

​There you will see something like the below image​ where you can specify the tree and the person to link the DNA test to. When you start typing a name, Ancestry will use auto complete to show possible names from your tree. Once you have selected yourself or the person whose kit it is, click the blue button to make the connection.

The tool Ancestry uses to find and display relationships based on trees linked to DNA results is called ThruLines which I have numerous posts about. Now for an example of what this can produce.
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Using Segment Sizes in DNA Relationship Predictions

Apr13

Segment sizes matter for predicting the closeness of a relationship. That is because inherited DNA chunks get divided up with each generation’s recombination, becoming smaller over time. It has often puzzled me that none of the DNA relationship calculators take that into account. The total centimorgans (cM) can be similar for lots of different relationships. Click here for my post on telling half siblings apart from aunt/uncle/niece/nephew relationships by using segment sizes.

Click here for Ancestry’s explanation of how they predict relationships and here for the article at 23andme. Neither mentions segment sizes.

Click this image for my slides demonstrating the DNA painter relationship calculator

My favorite calculator has long been the one at DNA Painter where the table is based on Blaine Bettinger’s collected data and the probabilities are by Leah Larkin based on the Ancestry white paper. It can work from a percentage or a cM value and lights up just the possible relationships in its table. Clicking on any table entry gets a histogram of frequencies.  I have slides showing how nicely it works, done for a recent talk about 3rd party DNA tools for the SCGS jamboree. Click the image above to see those. That video should be available to attendees from the web site genealogyjamboree.com

Recently a calculator was published at DNA-SCI which includes segment sizes by asking for the number of segments. I have used it for a number of closer relationships and have been very impressed with its results.
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