Partial Corpus Callosum Agenesis-Cerebellar Vermis Hypoplasia with Posterior Fossa Cysts Syndrome An important gene associated with Partial Corpus Callosum Agenesis-Cerebellar Vermis Hypoplasia with Posterior Fossa Cysts Syndrome is KPNA7 (Karyopherin Subunit Alpha 7). Affiliated tissues include brain.