MYT1 Role in the Microtia‐craniofacial Microsomia Spectrum

Background Craniofacial microsomia (CFM), also known as the oculo-auriculo-vertebral spectrum, comprises a variable phenotype with the most common features including microtia and mandibular hypoplasia on one or both sides, in addition to lateral oral clefts, epibulbar dermoids, cardiac, vertebral, and renal abnormalities. The etiology of CFM is largely unknown. TheMYT1gene has been reported as a candidate based in mutations found in three unrelated individuals. Additional patients with mutations in this gene are required to establish its causality. We present two individuals with CFM that have rare variants inMYT1contributing to better understand the genotype and phenotype associated with mutations in this gene. Methods/Results We conducted genetic analysis using whole-exome and -genome sequencing in 128 trios with CFM. Two novelMYT1mutations were identified in two participants. Sanger sequencing was used to confirm these mutations. Conclusion We identified two additional individuals with CFM who carry rare variants inMYT1, further supporting the presumptive role of this gene in the CFM spectrum.