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2006 | 53 | 1 | 157-168
Article title

Differential stability of mitochondrial mRNA in HeLa cells

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EN
Abstracts
EN
The physiological significance and metabolism of oligoadenylated and polyadenylated human mitochondrial mRNAs are not known to date. After study of eight mitochondrial transcripts (ND1, ND2, ND3, ND5, CO1, CO2, ATP6/8 and Cyt. b) we found a direct correlation between the half-lives of mitochondrial mRNAs and their steady-state levels. Investigation of the mt-mRNA decay after thiamphenicol treatment indicated that three transcripts (ND2, ND3 and Cyt. b) are significantly stabilized after inhibition of mitochondrial translation. Careful analysis one of them, ND3, showed that inaccurate processing of the H-strand RNA precursor may occasionally occur between the ND3 and tRNAArg locus leading to synthesis of ND3 mRNAs lacking the STOP codon. However, analysis of the oligo(A) fraction observed in case of the ND3 indicates that partially polyadenylated mRNAs are linked rather to the transcription process than to the translation-dependent deadenylation. Analysis of ND3 mRNA turnover in cells with siRNA-mediated knock-down of the mitochondrial poly(A) polymerase shows that strongly decreased polyadenylation does not markedly affect the decay of this transcript. We present a model where oligoadenylated mitochondrial transcripts are precursors of molecules containing full length poly(A) tails.
Publisher

Year
Volume
53
Issue
1
Pages
157-168
Physical description
Dates
published
2006
received
2005-08-30
revised
2005-10-17
accepted
2005-10-19
(unknown)
2005-12-21
Contributors
  • Department of Genetics, Warsaw University, Warszawa, Poland
  • Department of Genetics, Warsaw University, Warszawa, Poland
  • Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warszawa, Poland
  • Department of Genetics, Warsaw University, Warszawa, Poland
  • Department of Genetics, Warsaw University, Warszawa, Poland
author
  • Department of Genetics, Warsaw University, Warszawa, Poland
  • Department of Genetics, Warsaw University, Warszawa, Poland
  • Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warszawa, Poland
author
  • Department of Genetics, Warsaw University, Warszawa, Poland
References
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-abpv53p157kz
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