Inversions and Recombinations in Mitochondrial DNA of the (SG-1) Cytoplasmic Mutant in Two Neurospora Species

Overview

Journal Curr Genet

Specialty Genetics

Date 1986 Jan 1

PMID 2832078

Citations 6

Authors

A Infanger

H Bertrand

Affiliations

Soon will be listed here.

Abstract

The mitochondrial DNAs of [SG-1] cytoplasmically-mutant and wild-type strains of Neurospora crassa and Neurospora sitophila were examined by comparative restriction endonuclease analyses. The mtDNA of N. sitophila wild type of Whitehouse differs from type II mtDNA of N. crassa by insertions of 3.3 kb in EcoRI-9, and 1.2 kb in EcoRI-3, and a deletion of 1.1 kb in EcoRI-5. These DNA heteromorphisms provided convenient markers for tracing N. crassa [SG-1] mtDNA during and after its transfer into N. sitophila. The [SG-1] cytoplasmic mutant in both N. crassa and N. sitophila has a distinctive inversion that connects the fragment EcoRI-4 with HindIII-10a. The [SG-1] mtDNA from N. crassa remained essentially intact after it was transferred by crosses into N. sitophila. In each species, a unique second inversion occurred in the [SG-1] mtDNA after the transfer was made. In N. sitophila, polar recombination in heteroplasmons between [SG-1] and wild-type preferentially yields strains with mtDNAs that contain the maximum possible number of insertions in the cob and co-1 loci of the EcoRI-3 region of the mitochondrial chromosome.

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