{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,9,17]],"date-time":"2025-09-17T05:47:10Z","timestamp":1758088030223,"version":"3.44.0"},"reference-count":39,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2025,9,16]],"date-time":"2025-09-16T00:00:00Z","timestamp":1757980800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Immunol."],"abstract":"<jats:p>Human-induced pluripotent stem cells with broad immune compatibility are highly desirable for regenerative medicine applications. Human leukocyte antigen (HLA) class I homozygous cell sources are ideal for immune compatibility modeling. Here, we profile <jats:italic>HLA-A<\/jats:italic>, <jats:italic>HLA-B<\/jats:italic>, and <jats:italic>HLA-C<\/jats:italic> alleles in 3,496 Lithuanian donors genotyped at three-field resolution. The five most frequent alleles constitute 74.6% of <jats:italic>HLA-A<\/jats:italic>, 43.2% of <jats:italic>HLA-B<\/jats:italic>, and 59.2% of <jats:italic>HLA-C<\/jats:italic>, with HLA-A*02:01:01, HLA-B*07:02:01, and HLA-C*07:02:01 being the most common. Lithuanian allele frequencies closely resemble those of European-American and British populations. We identified 153 double homozygotes and 51 triple homozygotes for <jats:italic>HLA-A<\/jats:italic>, <jats:italic>HLA-B<\/jats:italic>, and <jats:italic>HLA-C<\/jats:italic>. Compatibility modeling showed that triple homozygous profiles match 60.5% of Lithuanians, 13.4% of the British population, and 7.4% of European-Americans. CRISPR-Cas9 guide RNA design yielded 54 candidates predicted to disrupt <jats:italic>HLA-A<\/jats:italic> or <jats:italic>HLA-B<\/jats:italic> while preserving <jats:italic>HLA-C<\/jats:italic>, producing edited profiles matching over 97.9% of Lithuanians, 95.7% of European-Americans, and 95.5% of the British population. Finally, we established 15 fibroblast lines from triple homozygotes as a bioresource for the derivation of human-induced pluripotent stem cells and immune compatibility studies.<\/jats:p>","DOI":"10.3389\/fimmu.2025.1626787","type":"journal-article","created":{"date-parts":[[2025,9,16]],"date-time":"2025-09-16T04:12:00Z","timestamp":1757995920000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Identification of HLA-A, HLA-B, and HLA-C triple homozygous and double homozygous donors: a path toward synthetic superdonor advanced therapeutic medicinal products"],"prefix":"10.3389","volume":"16","author":[{"given":"Daniel","family":"Naumovas","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Barbara","family":"Rojas-Araya","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Catalina 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