1998
DOI: 10.1590/s1415-47571998000400016
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Abstract: A recent locus duplication hypothesis for sMDH-B* was proposed to explain the complex electrophoretic pattern of six bands detected for the soluble form of malate dehydrogenase (MDH, EC 1.1.1.37) in 84% of the Geophagus brasiliensis (Cichlidae, Perciformes) analyzed (AB1B2 individuals). Klebe's serial dilutions were carried out in skeletal muscle extracts. B1 and B2 subunits had the same visual end-points, reflecting a nondivergent pattern for these B-duplicated genes. Since there is no evidence of polyploidy … Show more

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Cited by 2 publications
(5 citation statements)
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“…Muscle extracts from 41 G. brasiliensis specimens confirmed both electrophoretic patterns for sMDH obtained previously by Monteiro et al (1991Monteiro et al ( , 1998 and Aquino-Silva et al (1998) (Figure 1). Assuming HardyWeinberg equilibrium, the χ 2 value for allele frequencies (178.6; 1d.f.…”
Section: Resultssupporting
confidence: 87%
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“…Muscle extracts from 41 G. brasiliensis specimens confirmed both electrophoretic patterns for sMDH obtained previously by Monteiro et al (1991Monteiro et al ( , 1998 and Aquino-Silva et al (1998) (Figure 1). Assuming HardyWeinberg equilibrium, the χ 2 value for allele frequencies (178.6; 1d.f.…”
Section: Resultssupporting
confidence: 87%
“…Consequently, the presence of a null allele proposed by Monteiro et al (1991Monteiro et al ( , 1998 is not probable. Considering the hypothesis of overdominance proposed by the same authors, the coefficient of selection and the segregational load (0.73 and 0.42, respectively according to Aquino-Silva et al 1998) obtained for this allele also makes this hypotesis improbable. In addition to this, allele frequencies indicated that these samples are not in equilibrium for this locus.…”
Section: Discussionmentioning
confidence: 88%
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“…(f = 0.041) Est-D3 2 allele. This atypically high Est-D3 0 silent null allele frequency for the 2n = 60 S. rhombeus population is about 2.5 times higher than the 0.40 described by Aquino-Silva et al (1998) for a null allele detected at a soluble malate dehydrogenase (sMDH-B2*) locus in Geophagus brasiliensis (Cichlidae, Perciformes) and far higher as compared with the low frequencies (under 5%) of null alleles at allozyme loci in natural Drosophila melanogaster populations (Voelker et al, 1980;Langley et al, 1981). Despite the excess of Est-D3 22 homozygotes and a corresponding deficiency of predictable Est-D3 20 heterozygotes on the Est-D3 locus, the observed number of the Est-D3 00 null genotype for the 2n = 60 cytotype showed good agreement with the statistical expectation, discarding the possibility of the Est-D3 0 silent null allele being interpreted as a technical artifact (Table 1).…”
mentioning
confidence: 61%
“…Despite the excess of Est-D3 22 homozygotes and a corresponding deficiency of predictable Est-D3 20 heterozygotes on the Est-D3 locus, the observed number of the Est-D3 00 null genotype for the 2n = 60 cytotype showed good agreement with the statistical expectation, discarding the possibility of the Est-D3 0 silent null allele being interpreted as a technical artifact (Table 1). Although there are some examples in the literature associating the presence of null alleles with possible mildly deleterious effects to its carriers (see Aquino-Silva et al,1998), this kind of association involving the silent Est-D3 0 allele in the 2n = 60 cytotype could only be effectively tested for by crossing experiments with Est-D3 22 and Est-D3 00 homozygotes.…”
mentioning
confidence: 99%