Title

Matchmaking facilitates the diagnosis of an autosomal-recessive mitochondrial disease caused by biallelic mutation of the tRNA isopentenyltransferase (TRIT1) gene.

Document Type

Article

Publication Date

5-2017

Identifier

https://doi.org/10.1002/humu.23196

Abstract

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.

Journal Title

Human mutation

Volume

38

Issue

5

First Page

511

Last Page

516

MeSH Keywords

Adolescent; Alkyl and Aryl Transferases; Alleles; Brain; Child; Child, Preschool; Facies; Female; Genes, Recessive; Genetic Testing; Homozygote; Humans; Magnetic Resonance Imaging; Male; Mitochondrial Diseases; Mutation; Phenotype

Keywords

brain anomalies; developmental disorders; epilepsy; intellectual disability; tRNA

Comments

Grant support

Contract grant sponsors: Marion Merrell Dow Foundation; Children's Mercy ‐ Kansas City, Patton Trust; W.T. Kemper Foundation; Pat & Gil Clements Foundation; Claire Giannini Foundation; Black & Veatch; Genome Canada; Canadian Institutes of Health Research; Ontario Genomics Institute; Ontario Research Fund; Genome Quebec; Children's Hospital of Eastern Ontario Foundation.

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