3 Reasons to Test mtDNA

Diahan Southard

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Should you take an mtDNA test for genetic genealogy? Here’s a free video tutorial and 3 scenarios when mtDNA testing can help your family history.

DNA testing is becoming more and more integrated into our traditional genealogical research. Millions of people have completed some form of DNA test, and the idea that genetics can help in your genealogy is finally a commonplace notion.

However, in the wake of the widespread success of autosomal DNA testing at companies like Ancestry.com and 23andMe, the two other kinds of DNA tests are often overlooked. The Y chromosome DNA that traces a direct paternal line has gotten some attention, but the mitochondrial DNA test, or mtDNA, for direct female lines is still underutilized.

Introduction to mtDNA testing

mtDNA+Inheritance+Grapghic-01.jpg Your mtDNA is directly maternally inherited, meaning that you have the same mtDNA as your mother and all of your siblings. It is the same mtDNA as your maternal grandmother, and her mother, and so on, for ten generations or more.

Unlike autosomal DNA testing, mtDNA reliably reaches back past the fourth or fifth generation in your pedigree. But unlike YDNA tests, it doesn’t tell you how closely you are related to your mtDNA matches. So it’s a test that needs to be used strategically.

Here’s a quick video tutorial to help you better understand mtDNA testing, followed by 3 scenarios when you might want to turn to mtDNA.

 

3 Reasons for Taking an mtDNA test

1. Fading mtDNA line

Let’s say you have an ailing great aunt, or you yourself are one of the last remaining carriers of your mother’s mtDNA.

Having your mtDNA tested first and foremost creates a record of your direct maternal line. Just as you would obtain a birth certificate or marriage license for your ancestor to see what other important genealogical information it might contain, having a record of your mtDNA is an important part of documenting your maternal line.

2. Female ancestor with unknown ethnicity

Let’s say you have a female ancestor whose ethnicity is unknown. Perhaps you think she is Native American or African American.

Along with your mtDNA profile, which helps you make connections with others, taking an mtDNA test gives you a haplogroup, or a deep ancestral group. There are different haplogroups for different world regions and populations. Sometimes knowing your haplogroup can help either confirm or dispel a family rumor about the heritage of a particular ancestor. Though for most it will just verify what you already know, like confirming that your maternal line is from western Europe.

3. Total brick wall

Let’s say it feels like, in 1873, aliens deposited your female ancestor in Virginia! If you have tried every other avenue to discover your ancestor’s origins, and currently your best theory of her origins revolves around extraterrestrial beings, you can try mtDNA testing.

The results of the testing will provide you with a list of individuals who may share direct maternal line ancestry with you, and therefore might be related to this mystery ancestor. However, that shared ancestor could be as recent as 1873, or as distant as dates that require the postnominal “B.C.” So, it is more or less a shot in the dark. But hey, if you don’t shoot, you will definitely miss!

Next steps

In general, mtDNA testing should not be the first test you turn to when seeking out your ancestors. But it does have its place in your genealogical toolbox, especially as an option to test out a research theory, so don’t be afraid to pull it out once in awhile. You can test your mtDNA at Family Tree DNA*.

mtDNA+2nd edition.png If you decide to test, I highly recommend you also purchase my inexpensive-yet-valuable Mitochondrial DNA (mtDNA) for the Genealogist guide. It explains what this kind of test may tell you, what haplogroups really tell you, and how to understand and work with your matches, which is definitely a different experience than working with autosomal matches.

Take me to that Quick Guide!

Part of this article originally appeared at www.genealogygems.com. Revised and updated in 2019 and 2020.

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<a href="https://www.yourdnaguide.com/author/guideyourdnaguide-com" target="_self">Diahan Southard</a>

Diahan Southard

As founder and CEO of Your DNA Guide, Diahan Southard has been teaching people how to find family history answers in their DNA for several years, and she's been in the genetic genealogy field since its infancy. Diahan teaches internationally, writes for popular magazines, consults with leading testing companies, is author of Your DNA Guide–The Book, and producer of Your DNA Guide–the Academy, an online learning experience.

4 Comments

  1. Pam Cornwell

    Hi Diahan! It’s Pam Cornwell from summer 2021 Y-DNA class! For my birthday my kids got me a mtDNA Full Sequence test kit from FTDNA and I watched this so I could explain to them why it’s a great gift for them to have purchased for me. Love your videos and your style of thorough teaching!

    Reply
    • Diahan

      So fun to hear from you Pam! So glad you are still doing the DNA!!

      Reply
  2. Willie J Lenard

    My mother was kidnapped as a child and we I have exhausted all possible leads to finding her relatives. I would like to take the mtDNA exam; however, I would like to hire a counselor to assist me.

    Reply

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