The latest articles on DEV Community by Sveta Kors (@sveta_kors_c98787db329806). https://dev.to/sveta_kors_c98787db329806 https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3925431%2Fb26c93b7-702e-480b-93e8-dd28bdfd9bb5.jpg https://dev.to/sveta_kors_c98787db329806 en Sveta Kors Mon, 11 May 2026 16:58:24 +0000 https://dev.to/sveta_kors_c98787db329806/parsing-raw-dna-files-why-23andme-and-myheritage-are-incompatible-13p3 https://dev.to/sveta_kors_c98787db329806/parsing-raw-dna-files-why-23andme-and-myheritage-are-incompatible-13p3 <p>While working with consumer DNA data, I noticed that many people assume raw DNA files from different providers are compatible with each other. In practice, this is rarely true.</p> <p>Services like:</p> <ul> <li>23andMe</li> <li>AncestryDNA</li> <li>MyHeritage</li> <li>FamilyTreeDNA</li> </ul> <p>all export genetic data differently.</p> <p>For example:</p> <h2> 23andMe </h2> <p>Uses a TSV-like structure with:</p> <ul> <li>rsid</li> <li>chromosome</li> <li>position</li> <li>genotype</li> </ul> <p>Example:<br> </p> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code>rs3094315 1 752566 AA </code></pre> </div> <h2> AncestryDNA </h2> <p>Uses CSV formatting and separate allele handling.</p> <h2> MyHeritage </h2> <p>Uses another CSV variant with different parsing expectations.</p> <p>Even though the biological data is similar, direct upload between services often fails because:</p> <ul> <li>column order differs</li> <li>delimiters differ</li> <li>genotype representation varies</li> <li>SNP coverage is inconsistent</li> </ul> <p>I created a small open-source repository documenting these differences and conversion logic between providers.</p> <p>GitHub:<br> <a href="https://github.com/milaza/dna-raw-data-converter-23andme-myheritage-ancestry/" rel="noopener noreferrer">https://github.com/milaza/dna-raw-data-converter-23andme-myheritage-ancestry/</a></p> <p>The repository includes:</p> <ul> <li>format explanations</li> <li>conversion examples</li> <li>sample files</li> <li>compatibility notes</li> </ul> <p>There is also an online converter for users who do not want to manually process raw DNA data:<br> <a href="https://tendna.com/en/dna-converter" rel="noopener noreferrer">https://tendna.com/en/dna-converter</a></p> <p>It was interesting to discover how fragmented consumer genetic data formats still are, despite the growing popularity of DNA testing.</p> dna 23andme myheritage science