Evidence Regarding Metachromatic Leukodystrophy Newborn Screening.
Metachromatic leukodystrophy (MLD) is a lysosomal disorder affecting approximately 1 per 100 000 newborns. It is caused by biallelic variations in the arylsulfatase A (ARSA) gene, leading to deficiency of ARSA enzyme activity and elevation of sulfatides. Most affected individuals have the late-infantile or early-juveni...