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• W1979793615 endingPage "e1003888" @default.
• W1979793615 startingPage "e1003888" @default.
• W1979793615 abstract "We describe a new syndrome of young onset diabetes, short stature and microcephaly with intellectual disability in a large consanguineous family with three affected children. Linkage analysis and whole exome sequencing were used to identify the causal nonsense mutation, which changed an arginine codon into a stop at position 127 of the tRNA methyltransferase homolog gene TRMT10A (also called RG9MTD2). TRMT10A mRNA and protein were absent in lymphoblasts from the affected siblings. TRMT10A is ubiquitously expressed but enriched in brain and pancreatic islets, consistent with the tissues affected in this syndrome. In situ hybridization studies showed that TRMT10A is expressed in human embryonic and fetal brain. TRMT10A is the mammalian ortholog of S. cerevisiae TRM10, previously shown to catalyze the methylation of guanine 9 (m(1)G9) in several tRNAs. Consistent with this putative function, in silico topology prediction indicated that TRMT10A has predominant nuclear localization, which we experimentally confirmed by immunofluorescence and confocal microscopy. TRMT10A localizes to the nucleolus of β- and non-β-cells, where tRNA modifications occur. TRMT10A silencing induces rat and human β-cell apoptosis. Taken together, we propose that TRMT10A deficiency negatively affects β-cell mass and the pool of neurons in the developing brain. This is the first study describing the impact of TRMT10A deficiency in mammals, highlighting a role in the pathogenesis of microcephaly and early onset diabetes. In light of the recent report that the type 2 diabetes candidate gene CDKAL1 is a tRNA methylthiotransferase, the findings in this family suggest broader relevance of tRNA methyltransferases in the pathogenesis of type 2 diabetes." @default.
• W1979793615 created "2016-06-24" @default.
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• W1979793615 date "2013-10-31" @default.
• W1979793615 modified "2023-10-14" @default.
• W1979793615 title "tRNA Methyltransferase Homolog Gene TRMT10A Mutation in Young Onset Diabetes and Primary Microcephaly in Humans" @default.
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• W1979793615 doi "https://doi.org/10.1371/journal.pgen.1003888" @default.
• W1979793615 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3814312" @default.
• W1979793615 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24204302" @default.
• W1979793615 hasPublicationYear "2013" @default.
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