Monozygotic twins discordant for a congenital cranial dysinnervation disorder with features of Moebius syndrome.

Moebius syndrome is a congenital cranial dysinnervation disorder (CCDD) that presents with nonprogressive cranial nerve (CN) VI and VII palsies resulting in facial weakness and inability to abduct the eye(s). While many CCDDs have an underlying genetic cause, the etiology of Moebius syndrome remains unclear as most cases are sporadic. Here, we describe a pair of monochorionic, diamniotic twin girls; one with normal growth and development, and one with micrognathia, reduced facial expression, and poor feeding. Magnetic resonance imaging of the brain performed on the affected twin at 19 months of age showed severely hypoplastic or absent CN IV bilaterally, left CN VI smaller than right, and bilateral hypoplastic CN VII and IX, consistent with a diagnosis of a CCDD, most similar to that of Moebius syndrome. Genomic sequencing was performed on each twin and data was assessed for discordant variants, as well as variants in novel and CCDD-associated genes. No pathogenic, likely pathogenic, or variants of uncertain significance were identified in genes known to be associated with CCDDs or other congenital facial weakness conditions. This family provides further evidence in favor of a stochastic event as the etiology in Moebius syndrome, rather than a monogenic condition.

Medical genetics education for pediatrics residents: A brief report.

PURPOSE: Genetic testing is ubiquitous in the field of medicine and is often ordered or requested by primary care providers, nongenetics subspecialists, and patients themselves. Other studies have shown that providers are often not comfortable ordering genetic testing. There have been initiatives to teach these concepts via continuing medical education; however, there is not a standardized training program for teaching resident physicians about genetic testing. METHODS: During September to October 2020, we recruited all the pediatrics residents at our institution via email (N = 102). Residents were invited to complete a Qualtrics electronic survey that addressed self-perceived level of knowledge about core concepts of genetic testing, as well as self-perceived confidence discussing these concepts with families. RESULTS: Response rate was 46 to 102 (45%). Proportions of respondents reporting they felt insufficiently knowledgeable ranged from 28% (basic concepts of genetics) to 80% (Genetic Information Nondiscrimination Act). Most pediatrics residents agreed that a curriculum teaching basics of genetic testing would be helpful to them. Desired curricular topics included indications and limitations of genetic testing, testing procedures, and counseling families. CONCLUSION: Despite its expanding importance across medicine, genetics education is lacking in pediatrics residency programs and residents would benefit from a curriculum teaching basic concepts of genetic testing.