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Hypomorphic mutations in TRNT1 cause retinitis pigmentosa with erythrocytic microcytosis
Journal article   Open access   Peer reviewed

Hypomorphic mutations in TRNT1 cause retinitis pigmentosa with erythrocytic microcytosis

Adam P DeLuca, S Scott Whitmore, Jenna Barnes, Tasneem P Sharma, Trudi A Westfall, C Anthony Scott, Matthew C Weed, Jill S Wiley, Luke A Wiley, Rebecca M Johnston, …
Human molecular genetics, Vol.25(1), pp.44-56
01/01/2016
DOI: 10.1093/hmg/ddv446
PMCID: PMC4690490
PMID: 26494905
url
https://doi.org/10.1093/hmg/ddv446View
Published (Version of record) Open Access

Abstract

Retinitis pigmentosa (RP) is a highly heterogeneous group of disorders characterized by degeneration of the retinal photoreceptor cells and progressive loss of vision. While hundreds of mutations in more than 100 genes have been reported to cause RP, discovering the causative mutations in many patients remains a significant challenge. Exome sequencing in an individual affected with non-syndromic RP revealed two plausibly disease-causing variants in TRNT1, a gene encoding a nucleotidyltransferase critical for tRNA processing. A total of 727 additional unrelated individuals with molecularly uncharacterized RP were completely screened for TRNT1 coding sequence variants, and a second family was identified with two members who exhibited a phenotype that was remarkably similar to the index patient. Inactivating mutations in TRNT1 have been previously shown to cause a severe congenital syndrome of sideroblastic anemia, B-cell immunodeficiency, recurrent fevers and developmental delay (SIFD). Complete blood counts of all three of our patients revealed red blood cell microcytosis and anisocytosis with only mild anemia. Characterization of TRNT1 in patient-derived cell lines revealed reduced but detectable TRNT1 protein, consistent with partial function. Suppression of trnt1 expression in zebrafish recapitulated several features of the human SIFD syndrome, including anemia and sensory organ defects. When levels of trnt1 were titrated, visual dysfunction was found in the absence of other phenotypes. The visual defects in the trnt1-knockdown zebrafish were ameliorated by the addition of exogenous human TRNT1 RNA. Our findings indicate that hypomorphic TRNT1 mutations can cause a recessive disease that is almost entirely limited to the retina.
 Gene Expression Mutation Humans Cells, Cultured Retinitis Pigmentosa - genetics Male Zebrafish Nucleotides - metabolism Sequence Analysis, DNA Exome Young Adult RNA Splicing Animals Phosphoproteins Adolescent Nucleotidyltransferases - genetics Carrier Proteins Perilipin-1

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