Identification of a Rare Branch Point Variant in the SMS Gene in a Large Family With a Severe Form of Snyder-Robinson Syndrome.

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Identification of the first pathogenic branch point variant in the SMS gene in a large French non-consanguineous family with a phenotype retrospectively consistent with Snyder-Robinson syndrome. RT-PCR analysis followed by RNA-sequencing demonstrated that this variant, lead to the synthesis of a predominant aberrant transcript with complete intron 6 retention.