Orofacial clefting in PHF6-related Börjeson-Forssman-Lehmann syndrome.

Börjeson-Forssman-Lehmann syndrome (BFLS) is a rare X-linked neurodevelopmental disorder caused by pathogenic variants in the plant homeodomain finger protein 6 (PHF6) gene. Core features include developmental delay, intellectual disability, dysmorphic craniofacial characteristics, obesity, hypogonadism and digital anomalies. Orofacial clefting has not been recognised as part of the canonical phenotype and is rarely reported in association with BFLS. One cohort study listed cleft lip and/or palate as an uncommon feature without individual case details, and a separate report described a female with a nonsense PHF6 variant and clefting of the hard and soft palate. Here, we describe a BFLS female with a de novo missense PHF6 variant who presented with cleft palate. This case adds to the emerging evidence that clefting, though uncommon, may be a recurrent manifestation. It supports the inclusion of PHF6 in the genetic testing of patients presenting with syndromic orofacial clefting when accompanied by neurodevelopmental delay or dysmorphism.