Recombinant mitochondrial DNA molecules suggest a template switching ability for group-II-intron reverse transcriptase.

Abstract:

:Degenerative processes in the filamentous fungus Podospora anserina are strongly correlated with the instability of the mitochondrial genome. Among the sources of instability is the mobile group-II intron COX1-i1, also called intron alpha, which encodes a protein with a reverse transcriptase activity. In this paper we characterize, through PCR experiments, mitochondrial recombinant DNA molecules joining the 5' end of intron alpha to the 3' end of tRNA sequences including the CCA motif. The structure of these junctions led us to propose that they were most probably initiated by a RNA template switching of the reverse transcriptase encoded in COX1-i1. This activity might be involved in a number of mitochondrial rearrangements occurring in degenerative syndromes and in some long-lived mutants.

journal_name

Curr Genet

journal_title

Current genetics

authors

Sellem CH,Begel O,Sainsard-Chanet A

doi

10.1007/s002940050003

subject

Has Abstract

pub_date

2000-01-01 00:00:00

pages

24-8

issue

1

eissn

0172-8083

issn

1432-0983

journal_volume

37

pub_type

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