Chylomicron retention disease (CRD) is a rare autosomal recessive disorder characterized by malabsorption, failure to thrive (FTT), developmental difficulties, mental retardation, abnormal vibration sense, and hyporeflexia. CRD is caused by a mutation in the SAR1B gene, which codes for an essential component of the vesicular coat protein complex II (COPII) necessary for endoplasmic reticulum to Golgi transport.
