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Abstract：
Heterozygous variants in USP9X are associated with female-restricted X-linked mental retardation (MRXS99F), a rare syndrome characterized by neurodevelopmental delay, intellectual disability (ID), and a wide variety of additional congenital anomalies. Here, we report a girl harboring a novel de novo loss-of-function variant in USP9X (c.4091delinsAG, p.Thr1364Lysfs*7), and literature review revealed novel prenatal features associated with MRXS99F, expanding the genotypic and phenotypic landscape of the syndrome. It is important to consider X-linked diseases in girls with ID and perform directed molecular investigation to provide correct diagnosis and prognosis.
摘要：
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