AbstractBackgroundNonketotic hyperglycinemia (NKH) is a rare metabolic disorder that is characterized by high levels of glycine in plasma and cerebrospinal fluid in humans. In this study, total congenital cataract captive‐bred Vervet monkeys (Chlorocebus aethiops) that are hyperglycinemic were screened to identify mutations in Bola type 3 (BOLA3), glutaredoxin 5 (GLRX5), and lipoate synthase (LIAS) genes.MethodsTwenty‐four Vervet monkeys (12 hyperglycinemic and 12 healthy controls) were selected for mutation analysis using polymerase chain reaction (PCR), Sanger sequencing, and reverse transcriptase‐polymerase chain reaction (RT‐PCR).ResultsNovel sequence variants were identified in BOLA3 (R23H and Q38R) and LIAS (R369I and A371A), and gene expression in the control group was significantly lower compared to the hyperglycinemic group (P < 0.05).ConclusionThe data obtained from this study will contribute to generation of new knowledge regarding the involvement of these genes in NKH development.