Four of these decedents had compound heterozygous P/LP/VUS variants in genes associated with recessive disorders, including CFTR (cystic fibrosis), BCKDHA (maple syrup urine disease), MPDZ (congenital hydrocephalus-2), and GDAP1 (Charcot-Marie-Tooth disease, type 4A). This evidence concerns the gene MPDZ and maple syrup urine disease.