Evolutionary trends of LDH isozymes in fishes
Identifieur interne : 001409 ( Main/Exploration ); précédent : 001408; suivant : 001410Evolutionary trends of LDH isozymes in fishes
Auteurs : Vera Maria Fonseca De Almeida-Val [Brésil] ; Adalberto Luís Val [Brésil]Source :
- Comparative Biochemistry and Physiology -- Part B: Biochemistry and Molecular Biology [ 0305-0491 ] ; 1992.
Abstract
1.1. LDH characteristics (loci numbers, number of isozymes constituted by A and B subunits, and tissue specificity of LDH-C4) were reviewed for 245 fish species.2.2. The occurrence of different isozyme numbers among species of a single family (e.g. 3, 4 and 5 banded patterns), plus the existence of alleles generating 4 or 5 banded patterns in a single population indicate that the number of LDH isozymes constituted by A and B subunits might not be a character under selective pressure.3.3. The regulatory pattern of LDH-C∗ gene, i.e. its occurrence in several tissues of primitive fishes plus its highly restricted tissue distribution in advanced teleost, and even its absence in some intermediate groups (e.g. Characiformes and Siluriformes) suggest a possible selective pressure upon an ancient gene.4.4. Four evolutionary trends are suggested considering isozyme tissue distribution as well as LDH physiological role: (i) convergence of B to A subunit as in good anaerobes; (ii) restriction of B subunits in advanced teleost, resulting in the same pattern as in (i); (iii) non-divergence between A and B subunit as occurs in some Amazon fishes which are obligatory aerobes and (iv) the restriction of C subunit to specific tissues in advanced teleost reaching a high specialization degree, which physiological meaning is not explained yet.
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DOI: 10.1016/0305-0491(93)90164-Z
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LDH characteristics (loci numbers, number of isozymes constituted by A and B subunits, and tissue specificity of LDH-C4) were reviewed for 245 fish species.2.2. The occurrence of different isozyme numbers among species of a single family (e.g. 3, 4 and 5 banded patterns), plus the existence of alleles generating 4 or 5 banded patterns in a single population indicate that the number of LDH isozymes constituted by A and B subunits might not be a character under selective pressure.3.3. The regulatory pattern of LDH-C∗ gene, i.e. its occurrence in several tissues of primitive fishes plus its highly restricted tissue distribution in advanced teleost, and even its absence in some intermediate groups (e.g. Characiformes and Siluriformes) suggest a possible selective pressure upon an ancient gene.4.4. Four evolutionary trends are suggested considering isozyme tissue distribution as well as LDH physiological role: (i) convergence of B to A subunit as in good anaerobes; (ii) restriction of B subunits in advanced teleost, resulting in the same pattern as in (i); (iii) non-divergence between A and B subunit as occurs in some Amazon fishes which are obligatory aerobes and (iv) the restriction of C subunit to specific tissues in advanced teleost reaching a high specialization degree, which physiological meaning is not explained yet.</div></front></TEI><affiliations><list><country><li>Brésil</li></country><region><li>Amazonas (Brésil)</li></region></list><tree><country name="Brésil"><region name="Amazonas (Brésil)"><name sortKey="Fonseca De Almeida Val, Vera Maria" sort="Fonseca De Almeida Val, Vera Maria" uniqKey="Fonseca De Almeida Val V" first="Vera Maria" last="Fonseca De Almeida-Val">Vera Maria Fonseca De Almeida-Val</name></region><name sortKey="Val, Adalberto Luis" sort="Val, Adalberto Luis" uniqKey="Val A" first="Adalberto Luís" last="Val">Adalberto Luís Val</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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