Differential stability of mitochondrial mRNA in HeLa cells

• Autorzy: Piechota J. , Tomecki R. , Gewartowski K. , Szczesny R. , Dmochowska A. , Kudla M. , Dybczynska L. , Stepien P.P. , Bartnik E.
• Języki publikacji: EN

Abstrakty

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.

Słowa kluczowe

EN

mRNA turnover; metabolism; mitochondrion; man; polyadenylation; HeLa cell; mRNA

• Wydawca: -
• Czasopismo: Acta Biochimica Polonica
• Rocznik: 2006
• Tom: 53
• Numer: 1
• Opis fizyczny: p.157-167,fig.,ref.

Twórcy

autor

Piechota J.

• Warsaw University, Warsaw, Poland

autor

Tomecki R.

autor

Gewartowski K.

autor

Szczesny R.

autor

Dmochowska A.

autor

Kudla M.

autor

Dybczynska L.

autor

Stepien P.P.

autor

Bartnik E.

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