Contribution of Mitochondrial DNA Heteroplasmy to the Congenital Cardiac and Palatal Phenotypic Variability in Maternally Transmitted 22q11.2 Deletion Syndrome

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dc.contributor.authorRebolledo-Jaramillo, Boris
dc.contributor.authorHuckstadt, Victoria
dc.contributor.authorGómez, Abel
dc.contributor.authorRepetto, Gabriela
dc.contributor.authorObregón, María Gabriela
dc.date.accessioned2021-08-16T14:26:18Z
dc.date.available2021-08-16T14:26:18Z
dc.date.issued2021
dc.description.abstractCongenital heart disease (CHD) and palatal anomalies (PA), are among the most common characteristics of 22q11.2 deletion syndrome (22q11.2DS), but they show incomplete penetrance, suggesting the presence of additional factors. The 22q11.2 deleted region contains nuclear encoded mitochondrial genes, and since mitochondrial function is critical during development, we hypothesized that changes in the mitochondrial DNA (mtDNA) could be involved in the intrafamilial variability of CHD and PA in cases of maternally inherited 22q11.2DS. To investigate this, we studied the transmission of heteroplasmic mtDNA alleles in seventeen phenotypically concordant and discordant mother-offspring 22q11.2DS pairs. We sequenced their mtDNA and identified 26 heteroplasmic variants at >1% frequency, representing 18 transmissions. The median allele frequency change between a mother and her child was twice as much, with a wider distribution range, in PA discordant pairs, p-value = 0.039 (permutation test, 11 concordant vs. 7 discordant variants), but not in CHD discordant pairs, p-value = 0.441 (9 vs. 9). Only the variant m.9507T>C was considered to be pathogenic, but it was unrelated to the structural phenotypes. Our study is novel, yet our results are not consistent with mtDNA variation contributing to PA or CHD in 22q11.2DS. Larger cohorts and additional factors should be considered moving forward.es
dc.identifier.citationGenes, 2021, vol.12, 92es
dc.identifier.urihttps://doi.org/ 10.3390/genes12010092es
dc.identifier.urihttp://hdl.handle.net/11447/4310
dc.language.isoenes
dc.sourceGenes
dc.subject22q11.2 deletion syndromees
dc.subjectmtDNA heteroplasmyes
dc.subjectCongenital defectses
dc.titleContribution of Mitochondrial DNA Heteroplasmy to the Congenital Cardiac and Palatal Phenotypic Variability in Maternally Transmitted 22q11.2 Deletion Syndromees
dc.typeArticlees

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