NCBI Summary:
OSR2 is a mammalian homolog of the Drosophila odd-skipped family of transcription factors (Lan et al., 2004 [PubMed 15175245]).[supplied by OMIM]
General function
Transcription factor
Comment
Cellular localization
Nuclear
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Ovarian function
Comment
Functional evidence implicating FOXL2 in non syndromic premature ovarian failure and in the regulation of the transcription factor OSR2. Laissue P et al. BACKGROUND: FOXL2 encodes a forkhead transcription factor whose mutations are responsible for the Blepharophimosis-Ptosis-Epicanthus inversus Syndrome (BPES), involving craniofacial/palpebral abnormalities often associated with premature ovarian failure (POF). RESULTS: We describe a FOXL2 variant (p.Gly187Asp) in a case of POF without BPES. The subcellular localization of FOXL2-G187D was normal but its transactivation capacity tested on two reporter promoters, one of which should be relevant to the ovary, was significantly lower than that of normal FOXL2. However, FOXL2-G187D was able to strongly activate a reporter construct driven by the promoter of Osr2 (odd-skipped related 2 transcription factor), which we have suggested to be a crucial target of FOXL2 in the craniofacial region. This is compatible with the absence of BPES in our patient. CONCLUSIONS: Our data provide evidence in favor of the implication of FOXL2 variants in non-syndromic POF and confirm the regulatory interaction between FOXL2 and OSR2 whose perturbation might contribute to the palpebral abnormalities observed in BPES patients.