Background A homozygous founder mutation in MTPAP/TENT6, encoding mitochondrial poly(A) polymerase (MTPAP), was first reported in six individuals of Old Order Amish descent demonstrating an early-onset, progressive spastic ataxia with optic atrophy and learning difficulties. MTPAP contributes to the regulation ofmitochondrial gene expression through the polyadenylation of mitochondrially encoded mRNAs. Mitochondrial mRNAs with severely truncated poly(A) tails were observed in affected individuals, and mitochondrial protein expression was altered. Objective To determine the genetic basis of a perinatal encephalopathy associated with stereotyped neuroimagingandinfantile death in three patients fromtwounrelated families. Methods Whole-exome sequencing was performed in two unrelated patients and the unaffected parents of one of these individuals. Variants and familial segregation were confirmed by Sanger sequencing. Polyadenylation of mitochondrial transcripts and de novo synthesis of mitochondrial proteins were assessed in patient’s fibroblasts.
Biallelic mutations in MTPAP associated with a lethal encephalopathy
Francesco Bruni;
2020-01-01
Abstract
Background A homozygous founder mutation in MTPAP/TENT6, encoding mitochondrial poly(A) polymerase (MTPAP), was first reported in six individuals of Old Order Amish descent demonstrating an early-onset, progressive spastic ataxia with optic atrophy and learning difficulties. MTPAP contributes to the regulation ofmitochondrial gene expression through the polyadenylation of mitochondrially encoded mRNAs. Mitochondrial mRNAs with severely truncated poly(A) tails were observed in affected individuals, and mitochondrial protein expression was altered. Objective To determine the genetic basis of a perinatal encephalopathy associated with stereotyped neuroimagingandinfantile death in three patients fromtwounrelated families. Methods Whole-exome sequencing was performed in two unrelated patients and the unaffected parents of one of these individuals. Variants and familial segregation were confirmed by Sanger sequencing. Polyadenylation of mitochondrial transcripts and de novo synthesis of mitochondrial proteins were assessed in patient’s fibroblasts.File | Dimensione | Formato | |
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MTPAP_NP_2019.pdf
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neuped-08-2019-2320-OA.R1_Proof_hi.pdf
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