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Shieh, Meg; Amkraut, Keren; Spiridigliozzi, Gail A.; Adayev, Tatyana; Nicholson, Kaylea; McConkie‐Rosell, Allyn; McDonald, Marie; Pennington, Malinda; Sebastian, Siby; Lachiewicz, Ave M.
Clinical case reports, June 2023, Volume: 11, Issue: 6Journal Article
Key Clinical Message A high performing male with an unmethylated full mutation in the fragile X messenger ribonucleoprotein 1 (FMR1) gene surpassed our expectations into young adulthood. Although initial genetic findings helped make a correct fragile X syndrome (FXS) determination, the report was insufficient. Ten years later, we repeated and conducted additional genetic and clinical studies to determine whether more information could assist with treatment and counseling. The genetic findings were very consistent with his high functioning and would have enabled us to be more confident about a good developmental outcome had they been available previously. As FXS enters the mainstream of well‐understood genetic disorders and technological advancements improve genetic tests, it should be clearer to clinical providers what a full FXS assessment could include to provide high quality information for care. For individuals with FXS who are high functioning, their families and clinical professionals would benefit from knowing more genetic findings, including, most importantly, methylation status, but also the FMR1 protein (FMRP) level and mRNA level. While we now know that obtaining only the CGG repeat number is not always adequate to inform accurate clinical care, future studies are likely to show the benefit of studying other biomarkers, such as mRNA levels. Molecular analysis of FMR1 allele for Patient A.
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