FOXL2 mutations and genomic rearrangements in BPES

Human Mutation
Diane BeysenElfride De Baere

Abstract

The FOXL2 gene is one of 10 forkhead genes, the mutations of which lead to human developmental disorders, often with ocular manifestations. Mutations in FOXL2 are known to cause blepharophimosis syndrome (BPES), an autosomal dominant eyelid malformation associated (type I) or not (type II) with ovarian dysfunction, leading to premature ovarian failure (POF). In addition, a few mutations have been described in patients with isolated POF. Here, we review all currently described FOXL2 sequence variations and genomic rearrangements in BPES and POF. Using a combined mutation detection approach, it is possible to identify the underlying genetic defect in a major proportion (88%) of typical BPES patients. Of all genetic defects found in our BPES cohort, intragenic mutations represent 81%. They include missense changes, frameshift and nonsense mutations, in-frame deletions, and duplications, that are distributed along the single-exon gene. Genomic rearrangements comprising both deletions encompassing FOXL2 and deletions located outside its transcription unit, represent 12% and 5% of all genetic defects in our BPES cohort, respectively. One of the challenges of genetic testing in BPES is the establishment of genotype-phenotype correlati...Continue Reading

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