Genetic dissection of the Drosophila BLOC-1 complex reveals distinctions in synaptic localization and homeostatic plasticity.

Craniosynostosis is a condition characterized by premature fusion of one or more cranial sutures, resulting in abnormal skull growth and potential neurologic complications. The condition occurs in approximately 5.9 per 10,000 live births worldwide and may occur in isolated or syndromic forms []. Early diagnosis is important because untreated craniosynostosis may lead to elevated intracranial pressure and developmental impairment. However, abnormalities in cranial shape or size do not always represent true suture fusion. Cranial growth is closely linked to cerebral expansion, and impaired brain development can result in secondary cranial restriction even when sutures remain patent. Agenesis of the corpus callosum (ACC) is a congenital brain malformation resulting from the failure of commissural fibers to cross the midline during early fetal development. Formation is generally complete between 18 and 20 weeks of gestation []. ACC is a common congenital brain malformation, with an estimated incidence of approximately 1 in 4,000 individuals in the general population []. The clinical presentation of ACC varies widely and may include developmental delay, seizures, feeding difficulties, and structural craniofacial abnormalities [].  Recent longitudinal research has demonstrated that infants with ACC may exhibit developmental differences as early as 6 months of age, with communication skills affected earliest, followed by motor and daily living skills by 12 and 18 months []. Importantly, children with ACC have also been shown to have increased likelihood for autistic behaviors, making early recognition of social engagement deficits clinically significant []. Information on the neurodevelopment of patients younger than six months is lacking.  Blake pouch cyst (BPC) is a posterior fossa malformation within the Dandy-Walker continuum, resulting from a failure of fenestration of the posterior membranous area during embryogenesis []. BPC may occur in isolation or in association with other central nervous system anomalies. When present with ACC, the combination suggests a broader disruption of midline brain development during the first trimester [].