[Clinical analysis of a child with cardio-facio-cutaneous syndrome due to a de novo variant of MAP2K1 gene].

OBJECTIVE

To explore the genotype-phenotype correlation of a patient with cardio-facio-cutaneous syndrome (CFCS) due to variant of the MAP2K1 gene.

METHODS

DNA was extracted from peripheral blood samples of the infant and his parents and subjected to whole exome sequencing. Candidate variant was verified by Sanger sequencing.

RESULTS

The patient had typical CFCS facies and developmental delay, and was found to harbor a de novo heterozygous c.389A>G (p.Tyr130Cys) missense variant in exon 3 of the MAP2K1 gene. Based on the American college of Medical Genetics and Genomics guidelines, this variant was classified as likely pathogenic.

CONCLUSION

This patient has differed from previously reported cases by having no cardiac anomaly or seizures but typical facial features and skin abnormalities accompanied by growth retardation, intellectual impairment, and urinary malformation. It has therefore enriched the phenotypic spectrum of CFCS due to variants of the MAP2K1 gene.