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Matchmaking facilitates the diagnosis of an autosomal‐recessive mitochondrial disease caused by biallelic mutation of the tRNA isopentenyltransferase ( TRIT1 ) gene
Author(s) -
Kernohan Kristin D.,
Dyment David A.,
Pupavac Mihaela,
Cramer Zvi,
McBride Arran,
Bernard Genevieve,
Straub Isabella,
Tetreault Martine,
Hartley Taila,
Huang Lijia,
Sell Erick,
Majewski Jacek,
Rosenblatt David S.,
Shoubridge Eric,
Mhanni Aziz,
Myers Tara,
Proud Virginia,
Vergano Samanta,
Spangler Brooke,
Farrow Emily,
Kussman Jennifer,
Safiicole,
Saunders Carol,
Boycott Kym M.,
Thiffault Isabelle
Publication year - 2017
Publication title -
human mutation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.981
H-Index - 162
eISSN - 1098-1004
pISSN - 1059-7794
DOI - 10.1002/humu.23196
Subject(s) - biology , genetics , gene , mutation , microcephaly , mitochondrial dna , phenotype , disease , mitochondrial disease , transfer rna , identification (biology) , rna , medicine , botany , pathology
Deleterious variants in the same gene present in two or more families with overlapping clinical features provide convincing evidence of a disease–gene association; this can be a challenge in the study of ultrarare diseases. To facilitate the identification of additional families, several groups have created “matching” platforms. We describe four individuals from three unrelated families “matched” by GeneMatcher and MatchMakerExchange. Individuals had microcephaly, developmental delay, epilepsy, and recessive mutations in TRIT1 . A single homozygous mutation in TRIT1 associated with similar features had previously been reported in one family. The identification of these individuals provides additional evidence to support TRIT1 as the disease‐causing gene and interprets the variants as “pathogenic.” TRIT1 functions to modify mitochondrial tRNAs and is necessary for protein translation. We show that dysfunctional TRIT1 results in decreased levels of select mitochondrial proteins. Our findings confirm the TRIT1 disease association and advance the phenotypic and molecular understanding of this disorder.