Table 5.

SDS genetic subtypes

SDS Subtype	Approximate % of patients with SDS	Chromosome location	Gene product	Exons
Classic
Autosomal recessive	>90	7q11.21	SBDS	5
SDS-like
Autosomal recessive	<2	5p13.2	DNAJC21	14
	<2	15q25.2	EFL1	22
Autosomal dominant
	<2	14q13.2	SRP54	17