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Currently, genetic testing discerns the underlying genetic cause in less than 20% of sporadic HTX cases, indicating that genetic pathogenesis remains poorly understood. In this study, we aim to garner a deeper understanding of the genetic factors of this disease by documenting the effect of different matrix metalloproteinase 21 (MMP21) variants on disease occurrence and pathogenesis.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>Eighty-one HTX patients with complex congenital heart defects and 89 healthy children were enrolled, and we investigated the pathogenetic variants related to patients with HTX by exome sequencing. Zebrafish splice-blocking Morpholino oligo-mediated transient suppression assays were performed to confirm the potential pathogenicity of missense variants found in these patients with HTX.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>Three <jats:italic>MMP21<\/jats:italic> heterozygous non-synonymous variants (c.731G\u2009&gt;\u2009A (p.G244E), c.829C\u2009&gt;\u2009T (p.L277F), and c.1459A\u2009&gt;\u2009G (p.K487E)) were identified in three unrelated Chinese Han patients with HTX and complex congenital heart defects. Sanger sequencing confirmed that all variants were de novo. Cell transfection assay showed that none of the variants affect mRNA and protein expression levels of <jats:italic>MMP21<\/jats:italic>. Knockdown expression of <jats:italic>mmp21<\/jats:italic> by splice-blocking Morpholino oligo in zebrafish embryos revealed a heart looping disorder, and mutant human <jats:italic>MMP21<\/jats:italic> mRNA (c.731G\u2009&gt;\u2009A, c.1459A\u2009&gt;\u2009G, heterozygous mRNA (wild-type&amp;c.731G\u2009&gt;\u2009A), as well as heterozygous mRNA (wild-type&amp; c.1459A\u2009&gt;\u2009G) could not effectively rescue the heart looping defects. A patient with the MMP21 p.G244E variant was identified with other potential HTX-causing missense mutations, whereas the patient with the MMP21 p.K487E variant had no genetic mutations in other causative genes related to HTX.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>Our study highlights the role of the disruptive heterozygous <jats:italic>MMP21<\/jats:italic> variant (p.K487E) in the etiology of HTX with complex cardiac malformations and expands the current mutation spectrum of <jats:italic>MMP21<\/jats:italic> in HTX.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s40246-022-00409-9","type":"journal-article","created":{"date-parts":[[2022,9,19]],"date-time":"2022-09-19T11:03:12Z","timestamp":1663585392000},"update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["De novo disruptive heterozygous MMP21 variants are potential predisposing genetic risk factors in Chinese Han heterotaxy children"],"prefix":"10.1186","volume":"16","author":[{"given":"Xi-ji","family":"Qin","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Meng-meng","family":"Xu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jia-jun","family":"Ye","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yi-wei","family":"Niu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yu-rong","family":"Wu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rang","family":"Xu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fen","family":"Li","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Qi-hua","family":"Fu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sun","family":"Chen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kun","family":"Sun","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yue-juan","family":"Xu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2022,9,19]]},"reference":[{"issue":"7","key":"409_CR1","doi-asserted-by":"publisher","first-page":"R301","DOI":"10.1016\/j.cub.2018.02.073","volume":"28","author":"M Blum","year":"2018","unstructured":"Blum M, Ott T. 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