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Homozygosity for disease-causing variants in AMT and GLDC in a patient with severe nonketotic hyperglycinemia.

Andy DrackleyMerlene PeterPamela RathbunAlexander IngCarlos E PradaKai Lee Yap
Published in: American journal of medical genetics. Part A (2024)
Nonketotic hyperglycinemia (NKH) is a relatively well-characterized inborn error of metabolism that results in a combination of lethargy, hypotonia, seizures, developmental arrest, and, in severe cases, death early in life. Three genes encoding components of the glycine cleavage enzyme system-GLDC, AMT, and GCSH-are independently associated with NKH. We report on a patient with severe NKH in whom the homozygous pathogenic variant in AMT (NM_000481.3):c.602_603del (p.Lys201Thrfs*75) and the homozygous likely pathogenic variant in GLDC(NM_000170.2):c.2852C>A (p.Ser951Tyr) were both identified. Our patient demonstrates a novel combination of two homozygous disease-causing variants impacting the glycine cleavage pathway at two different components, and elicits management- and genetic counseling-related challenges for the family.
Keyphrases
  • case report
  • copy number
  • early onset
  • genome wide
  • photodynamic therapy
  • dna binding
  • gene expression
  • dna methylation
  • drug induced
  • cell proliferation
  • hepatitis c virus
  • hiv infected
  • temporal lobe epilepsy