[Genetic analysis of a child with recessive dystrophic epidermolysis bullosa due to compound heterozygous variants of (COL7A1 gene].

OBJECTIVE

To carry out genetic testing and prenatal diagnosis for a family affected with recessive dystrophic epidermolysis bullosa (RDEB).

METHODS

All exons of the COL7A1 gene and their flanking regions were subjected to PCR and Sanger sequencing. Suspected variant was validated in family members, based on which prenatal diagnosis was provided.

RESULTS

Sanger sequencing found that the proband has carried two variants of the COL7A1 gene, namely c.7289delC (p.Pro2430Glnfs*36) and c.7474C>T (p.Arg2492*), which were respectively derived from his mother and father. The same variants were not found among 100 healthy controls. By prenatal diagnosis, the fetus was found to have inherited the c.7474C>T (p.Arg2492*) variant from its father.

CONCLUSION

The pathogenic variants of the COL7A1 gene of the RDEB family were clarified, based on which prenatal diagnosis was provided.