We have a MyHeritage DNA matching update! Not only has MyHeritage DNA released a much better matching algorithm, the company that lets you upload your DNA for free has also introduced a chromosome browser. Your DNA Guide Diahan Southard shares the good news—and a quick introduction to her favorite matching tools on MyHeritage DNA.
In my first job as a grocery store clerk, I learned that most customer service issues can be solved if you listen carefully to the customer and do all you can to make it right. This is what MyHeritage has done.
MyHeritage DNA matching update
Now in January of 2018, all that patience has paid off. MyHeritage has updated its matching algorithm and recalibrated all the DNA matches in their system. The result is a much more robust depiction of our relationships with others in the database. Most users are seeing a dramatic increase in the total number of matches, and a significant decrease in the number of false positives, or matches that are on your match list but shouldn’t be.
Additionally, to the delight of many genetic genealogists, MyHeritage has launched a chromosome browser. This tool allows you to see the locations on the DNA that are shared with your match. Many genetic genealogists like to use this tool to help them visualize the shared DNA, and group their DNA matches.
Now that the matching algorithm has improved, I’d like to recommend three great tools you should be using at MyHeritage to help you identify your genetic matches. Yes, one of them is the chromosome browser–but take a look at these others, too. And take note: you won’t find these exact tools at AncestryDNA.
Tool #1: List of possible relationships for your genetic matches
In a recent blog post, I described how you can narrow down your possible relationships to your genetic matches by comparing your total shared DNA to a table developed by genetic genealogy experts. MyHeritage DNA simplifies that process for you with a customized chart for each of your genetic matches. Each chart visually shows you all possible relationships, even taking into account factors like your age and gender.
To access the chart, log in to your MyHeritage account. Under the DNA tab, select “Genetic Matches.” Then click on the little question mark icon next to the relationship suggestions:
Then you’ll see a chart that’s been customized for this relationship by highlighting all your possible relationships to this genetic match:
Tool #2: Longest piece of shared DNA with your genetic matches
In addition to the range of possibilities above, you can also be misled by the total amount of DNA you share with your genetic matches. Yes, you might actually be third cousins. But if your ancestors lived in a community that intermarried a lot because they were isolated geographically or culturally, you might also just share a lot of common DNA. You might be sixth cousins three times over.
The size of the biggest piece of DNA you share with a genetic match is really important for puzzling this out. Let’s say two of your genetic matches each share 30 centimorgans of DNA with you. Both are predicted to be your fourth cousins, but one person’s longest shared piece of DNA is 18 centimorgans long, and the other’s is 9 centimorgans long. The closer match–the one you should pursue first–is the one that shares the longest piece of DNA.
At MyHeritage DNA, you can sort your list of genetic matches by longest shared segment. At the top of your list, under the “All” drop-down menu, select “Largest Segment.” You may see your match list rearrange itself (this is a clue that the total shared DNA doesn’t tell you the whole story about genetic relatedness):
Then, click on your top genetic matches to see more detail about that longest segment:
Tool #3: NEW Chromosome browser
The new chromosome browser at MyHeritage is what they’re calling an “initial release” or first draft that “will be enhanced further soon.” It’s currently embedded in each of your individual match pages. That way, you can compare what areas of genetic material you and each of your matches have in common.
“It’s a free feature that can be used by all users on MyHeritage who have taken the DNA test or uploaded DNA data,” says a company press release. “It shows the shared segments between you and a DNA Match in purple. When you hover your mouse over any shared segment you can see the genomic position of the shared segment, the size of the segment, and the number of SNPs there. Grey segments are not shared with the DNA Match and crisscrossed sections were not analyzed due to the lack of SNPs in those regions.”
I’ll be back soon with more tips and tutorials on getting the most out of the new MyHeritage chromosome browser. I just wanted to alert you that it’s there—one more valuable tool in the MyHeritage DNA matching toolbox.
Advanced DNA tools for family history research
If you’re ready to get more genealogy information out of your DNA testing experience, consider whether Diahan’s Advanced DNA Bundle might be a good investment for you. These laminated guides are available singly (click on individual titles below) or as a value-priced bundle and can help you with very specific “next steps:”
- Gedmatch: A Next Step for Your Autosomal DNA Test. Gedmatch is a third‐party tool for use by genetic genealogists seeking to advance their knowledge of their autosomal DNA test. This guide navigates you through the myriad of options and point out only the best tools for your genetic genealogy research.
- Organizing Your DNA Matches. With millions of people now in the possession of a DNA test–and most with match lists in the thousands–many are wondering how to keep track of all this data and apply it to their family history. This guide provides the foundation for managing DNA matches and correspondence, and for working with forms, spreadsheets, and 3rd party tools.
- Next Steps: Working With Your Autosomal DNA Matches. This guide outlines what to do next to maximize the power of DNA testing in genealogy. With this guide in hand, genealogists will be prepared to take their DNA testing experience to the next level and make new discoveries about their ancestors and heritage.
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The Author: Diahan Southard
Your DNA Guide
Diahan Southard is Your DNA Guide here at Genealogy Gems! She has worked with the Sorenson Molecular Genealogy Foundation, and has been in the genetic genealogy industry since it has been an industry. She holds a degree in Microbiology and her creative side helps her break the science up into delicious bite-sized pieces for you. She’s the author of our DNA guides Getting Started: Genetics for Genealogists, and Y Chromosome DNA for Genealogists (click STORE in the menu above)