STRASBURG, PA- Researchers have combined the largest description of ST3GAL5 (GM3 synthase) deficiency using detailed natural history data from 104 individuals of Amish ancestry born between 1986 and 2017 with a definite or probable diagnosis of ST3GAL5 deficiency. The study examined objective measures of biochemistry, auditory function, brain development, and caregiver burden. GM3 synthase is encoded by ST3GAL5, and is essential for synthesis of the most biologically relevant gangliosides in mammals. The study, led by clinicians, represents a collaborative effort by the Plain Community Health Consortium (PCHC). PCHC is a network of non-profit clinics across five states that diagnose and treat rare genetic disorders in children from the Anabaptist communities.