Karyotypic Heterogeneity in South American Annual Killifishes of the Genu Cynolebias (Pisces, Cyprinodontiformes Rivulidae).

García, Graciela; Scvortzoff, E.; Hernández, Axel

doi:10.1508/cytologia.60.103

Cited by 19 publications

(28 citation statements)

References 12 publications

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“…5a–d). This type of chromosome rearrangement and its fixation in a homozygous state has already been described in several species of Cynolebias (García et al. 1995, 2001).…”

Section: Discussionsupporting

confidence: 57%

Multiple simultaneous speciation in killifishes of the Cynolebias adloffi species complex (Cyprinodontiformes, Rivulidae) from phylogeography and chromosome data

García

2006

J Zoological System

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The annual killifishes of the genus Cynolebias Steindachner, 1876, include one of the well-supported clades composed of the Cynolebias adloffi species complex of the Ban˜ados del Este Biosphere Reserve Site, from the Atlantic coastal wetlands in Uruguay. One member of this clade, Cynolebias charrua, has been considered as an intergradation complex of populations between C. adloffi and C. viarius by showing high levels of morphological variability. Systematic affinities between both taxa have been historically discussed. In the present study, a phylogeographic approach based on mitochondrial cytochrome b haplotype analysis and chromosome data are presented. According to the present data a scenario of a multiple simultaneous speciation process and perhaps reticulation events is possible in the C. adloffi species complex, followed by divergence associated with Quaternary marine transgressions in this region. This hypothetic scenario could explain the remarkable genetic diversity and the lack of phylogenetic resolution among clades in C. charrua, as well as the disconcordance in the phylogenetic relationships among Cynolebias from different data sets. Several parameters of DNA polymorphism and chromosome data have also suggested that populations of C. charrua from southern Laguna Merin, in eastern Uruguay and southern Brazil, could represent a relictual group from a widespread ancestral population. Chromosome rearrangements like pericentric inversions in isolated populations could have triggered cladogenetic events from this highly polymorphic population. Present analysis suggests that the metapopulation could represent the management units in these endangered killifishes and that the populations of C. charrua from the Laguna Merin basin could be included in a high-priority conservation programme.

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“…5a–d). This type of chromosome rearrangement and its fixation in a homozygous state has already been described in several species of Cynolebias (García et al. 1995, 2001).…”

Section: Discussionsupporting

confidence: 57%

Multiple simultaneous speciation in killifishes of the Cynolebias adloffi species complex (Cyprinodontiformes, Rivulidae) from phylogeography and chromosome data

García

2006

J Zoological System

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“…The origin of biarmed chromosomes from acrocentric ones could be related to some types of chromosome rearrangements such as pericentric inversions and/or heterochromatin addition. These chromosome rearrangements were previously reported in other Cyprinodontiformes fishes (García et al 1995), in reef fishes from the genus Centropyge (Affonso and Galetti Jr. 2005), in the genus Hypostomus (Artoni and Bertollo 1999) and in "bitterlings" of the family Cyprinidae (Ueda et al 2001). The partial or whole heteropycnotic biarmed chromosomes found in our analyses were also heterochromatic by means of C-banding.…”

Section: Discussionsupporting

confidence: 75%

Inheritance of a Dominant Spotted Melanic Mutation in the Livebearing Fish Phalloceros caudimaculatus var. reticulata from "Banados del Este" Reserve of Biosphere Site in Uruguay

Gutiérrez

García

2007

CYTOLOGIA

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Summary An alternative chromatic variation to the wild-type phenotype of the livebearing fish Phalloceros caudimaculatus (Phalloceros caudimaculatus var. reticulata) was detected in a single female from "Bañados del Este" Reserve of Biosphere Site, in Uruguay. The founder mutant female, which presented a melanic spotted pattern overlapping the wild-type pigmentation, produced laboratory breed strains. Four phenotypes showing different degrees of spotted patterns were obtained. In order to determine the inheritance of this chromatic mutation, experimental crosses and cytogenetic analyses of these laboratory strains were carried out. The breeding experiments among the spotted phenotypic classes and backcrosses suggest the dominant and non-sex linked inheritance of this mutation. Statistical tests demonstrated that the inheritance mechanism of this mutation does not correspond to a 2-gene independent segregation hypothesis as it was proposed in Poecilia sphenops, or to a single dominant gene hypothesis. Additionally, cytogenetic analyses detected a partially heterochromatic biarmed chromosome associated to the inheritance of the pigmentation pattern in laboratory breed strains.

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“…Since annual life cycle occurs in highly heterogeneous environments and seasonal habitats, several parameters may be considered in such life style as age-dependent mortality, non-overlapping generations and inbreeding in a full-sib group. In such context deterministic and stochastic factors could shape the population structure and chromosomal rearrangements reaching fixation in the homozygous state as was found in different species of Austrolebias (García et al 1993(García et al , 1995(García et al , 2001.…”

Section: Genome Repeat Expansion and Speciation In Austrolebiasmentioning

confidence: 96%

“…In fact, extensive karyotype divergence within and among species of Austrolebias by means of Robertsonian (centric fusion events) and nonRobertsonian (pericentric inversions) chromosomal rearrangement has been previously described, encompassing cladogenetic events in this genus (García et al 1993(García et al , 1995(García et al , 2001. The higher proportion of Babar and Ty3/Gypsy retroelements as well as Tc1-like transposons found in A. charrua could be associated with high rate of chromosomes changes by means of pericentric inversions occurring at intra and interpopulation levels in this taxon, as was previously reported (García 2006).…”

Section: Genome Repeat Expansion and Speciation In Austrolebiasmentioning

confidence: 99%

Next-generation sequencing detects repetitive elements expansion in giant genomes of annual killifish genus Austrolebias (Cyprinodontiformes, Rivulidae)

2015

Self Cite

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Among Neotropical fish fauna, the South American killifish genus Austrolebias (Cyprinodontiformes: Rivulidae) constitutes an excellent model to study the genomic evolutionary processes underlying speciation events. Recently, unusually large genome size has been described in 16 species of this genus, with an average DNA content of about 5.95 ± 0.45 pg per diploid cell (mean C-value of about 2.98 pg). In the present paper we explore the possible origin of this unparallel genomic increase by means of comparative analysis of the repetitive components using NGS (454-Roche) technology in the lowest and highest Rivulidae genomes. Here, we provide the first annotated Rivulidae-repeated sequences composition and their relative repetitive fraction in both genomes. Remarkably, the genomic proportion of the moderately repetitive DNA in Austrolebias charrua genome represents approximately twice (45%) of the repetitive components of the highly related rivulinae taxon Cynopoecilus melanotaenia (25%). Present work provides evidence about the impact of the repeat families that could be distinctly proliferated among sublineages within Rivulidae fish group, explaining the great genome size differences encompassing the differentiation and speciation events in this family.

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Karyotypic Heterogeneity in South American Annual Killifishes of the Genu Cynolebias (Pisces, Cyprinodontiformes Rivulidae).

Cited by 19 publications

References 12 publications

Multiple simultaneous speciation in killifishes of the Cynolebias adloffi species complex (Cyprinodontiformes, Rivulidae) from phylogeography and chromosome data

Multiple simultaneous speciation in killifishes of the Cynolebias adloffi species complex (Cyprinodontiformes, Rivulidae) from phylogeography and chromosome data

Inheritance of a Dominant Spotted Melanic Mutation in the Livebearing Fish Phalloceros caudimaculatus var. reticulata from "Banados del Este" Reserve of Biosphere Site in Uruguay

Next-generation sequencing detects repetitive elements expansion in giant genomes of annual killifish genus Austrolebias (Cyprinodontiformes, Rivulidae)

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