Prenatal diagnosis of recurrent hypoplastic left heart syndrome associated with MYH6 variants: a case report

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Abstract

Background: Hypoplastic left heart syndrome (HLHS) is a rare but genetically complex and clinically and anatomically severe form of congenital heart disease (CHD). Case presentation: Here, we report on the use of rapid prenatal whole-exome sequencing for the prenatal diagnosis of a severe case of neonatal recurrent HLHS caused by heterozygous compound variants in the MYH6 gene inherited from the (healthy) parents. MYH6 is known to be highly polymorphic; a large number of rare and common variants have variable effects on protein levels. We postulated that two hypomorphic variants led to severe CHD when associated in trans; this was consistent with the autosomal recessive pattern of inheritance. In the literature, dominant transmission of MYH6-related CHD is more frequent and is probably linked to synergistic heterozygosity or the specific combination of a single, pathogenic variant with common MYH6 variants. Conclusions: The present report illustrates the major contribution of whole-exome sequencing (WES) in the characterization of an unusually recurrent fetal disorder and considered the role of WES in the prenatal diagnosis of disorders that do not usually have a genetic etiology.

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Najib, B., Quibel, T., Tessier, A., Mortreux, J., Bouvagnet, P., Cohen, C., … Dard, R. (2023). Prenatal diagnosis of recurrent hypoplastic left heart syndrome associated with MYH6 variants: a case report. BMC Cardiovascular Disorders, 23(1). https://doi.org/10.1186/s12872-023-03169-z

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