EsturgeonV1, PubMed, Curation, bibRecord, 000690

Length variation, heteroplasmy and sequence divergence in the mitochondrial DNA of four species of sturgeon (Acipenser).

Identifieur interne : 000690 ( PubMed/Curation ); précédent : 000689; suivant : 000691

Length variation, heteroplasmy and sequence divergence in the mitochondrial DNA of four species of sturgeon (Acipenser).

Auteurs : J R Brown [Canada] ; K. Beckenbach ; A T Beckenbach ; M J Smith

Source :

Genetics [ 0016-6731 ] ; 1996.

RBID : pubmed:8852850

English descriptors

KwdEn :
- Animals, Base Sequence, DNA Primers, DNA, Mitochondrial, Fishes (genetics), Genetic Variation, Molecular Sequence Data, Nucleic Acid Conformation, Phylogeny, RNA, Transfer, Repetitive Sequences, Nucleic Acid, Restriction Mapping, Sequence Homology, Nucleic Acid.
MESH :
- chemical : DNA Primers, DNA, Mitochondrial, RNA, Transfer.
- genetics : Fishes.
- Animals, Base Sequence, Genetic Variation, Molecular Sequence Data, Nucleic Acid Conformation, Phylogeny, Repetitive Sequences, Nucleic Acid, Restriction Mapping, Sequence Homology, Nucleic Acid.

Abstract

The extent of mtDNA length variation and heteroplasmy as well as DNA sequences of the control region and two tRNA genes were determined for four North American sturgeon species: Acipenser transmontanus, A. medirostris, A. fulvescens and A. oxyrhnychus. Across the Continental Divide, a division in the occurrence of length variation and heteroplasmy was observed that was concordant with species biogeography as well as with phylogenies inferred from restriction fragment length polymorphisms (RFLP) of whole mtDNA and pairwise comparisons of unique sequences of the control region. In all species, mtDNA length variation was due to repeated arrays of 78-82-bp sequences each containing a D-loop strand synthesis termination associated sequence (TAS). Individual repeats showed greater sequence conservation within individuals and species rather than between species, which is suggestive of concerted evolution. Differences in the frequencies of multiple copy genomes and heteroplasmy among the four species may be ascribed to differences in the rates of recurrent mutation. A mechanism that may offset the high rate of mutation for increased copy number is suggested on the basis that an increase in the number of functional TAS motifs might reduce the frequency of successfully initiated H-strand replications.

PubMed: 8852850

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Le document en format XML

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<author><name sortKey="Brown, J R" sort="Brown, J R" uniqKey="Brown J" first="J R" last="Brown">J R Brown</name>
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<author><name sortKey="Beckenbach, A T" sort="Beckenbach, A T" uniqKey="Beckenbach A" first="A T" last="Beckenbach">A T Beckenbach</name>
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<front><div type="abstract" xml:lang="en">The extent of mtDNA length variation and heteroplasmy as well as DNA sequences of the control region and two tRNA genes were determined for four North American sturgeon species: Acipenser transmontanus, A. medirostris, A. fulvescens and A. oxyrhnychus. Across the Continental Divide, a division in the occurrence of length variation and heteroplasmy was observed that was concordant with species biogeography as well as with phylogenies inferred from restriction fragment length polymorphisms (RFLP) of whole mtDNA and pairwise comparisons of unique sequences of the control region. In all species, mtDNA length variation was due to repeated arrays of 78-82-bp sequences each containing a D-loop strand synthesis termination associated sequence (TAS). Individual repeats showed greater sequence conservation within individuals and species rather than between species, which is suggestive of concerted evolution. Differences in the frequencies of multiple copy genomes and heteroplasmy among the four species may be ascribed to differences in the rates of recurrent mutation. A mechanism that may offset the high rate of mutation for increased copy number is suggested on the basis that an increase in the number of functional TAS motifs might reduce the frequency of successfully initiated H-strand replications.</div>
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Length variation, heteroplasmy and sequence divergence in the mitochondrial DNA of four species of sturgeon (Acipenser).

Length variation, heteroplasmy and sequence divergence in the mitochondrial DNA of four species of sturgeon (Acipenser).

Source :

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

Pour générer des pages wiki