Heteromorphic Z and W sex chromosomes in Physalaemus ephippifer (Steindachner, 1864) (Anura, Leiuperidae)

Nascimento, Juliana Damieli; Quinderé, Yeda Rumi Serra Douglas; Recco‐Pimentel, Shirlei Maria; Lima, Janaina Reis Ferreira; Lourenço, Luciana Bolsoni

doi:10.1007/s10709-010-9501-9

Cited by 24 publications

(60 citation statements)

References 62 publications

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“…The diploid number of the five Engystomops species studied here was 2n = 20, the same 2n reported previously for E. pustulatus and E. puyango (Ron et al 2010 Silva et al 1999Silva et al , 2000Amaral et al 2000;Quinderé et al 2009;Tomatis et al 2009;Milani et al 2010;Nascimento et al 2010), which is considered to be the sister-group of Engystomops (Ron et al 2006;Nascimento et al 2005). Therefore, we conclude that the 2n reduction from 2n = 22 to 2n = 20 is a synapomorphy of Duovox clade of Engystomops.…”

Section: Discussionsupporting

confidence: 86%

“…Despite the high chromosomal variation, all the karyotypes described for E. petersi complex had 2n = 22, as did those found in E. freibergi (Lourenço et al 1999;Targueta et al 2010), in E. pustulosus (León 1970, and in the karyotyped species of Physalaemus (De Lucca et al 1974;Silva et al 1999Silva et al , 2000Amaral et al 2000;Quinderé et al 2009;Tomatis et al 2009;Milani et al 2010;Nascimento et al 2010), which is the sister-group of Engystomops (Ron et al 2006). On the other hand, E. puyango and E. pustulatus showed a karyotype composed of 2n = 20 (Ron et al 2010), raising a question about when the 2n reduction has occurred.…”

Section: Introductionmentioning

confidence: 73%

“…By comparing the 2n = 20 karyotypes of the species of the Duovox clade with the 2n = 22 karyotypes of E. freibergi, of E. petersi from Puyo (Targueta et al 2010) and of Physalaemus species (De Lucca et al 1974;Silva et al 1999Silva et al , 2000Amaral et al 2000;Quinderé et al 2009;Tomatis et al 2009;Milani et al 2010;Nascimento et al 2010), a great similarity can be identified for the seven first chromosome pairs. Despite that, the chromosomal data already available does not allow us to infer any chromosomal loss or rearrangement that might have resulted in the 2n reduction in the Duovox clade.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, this chromosome-10 heteromorphism may be related to the sex and may suggest the presence of heteromorphic sex chromosomes of the system ZZ/ZW in E. coloradorum. Although the NOR has been reported as a distinctive marker between sex chromosomes in some anuran species, Gastrotheca riobambae (Schmid et al 1983), Buergeria buergeri (Schmid et al 1993), Hyla femoralis , Wiley (2003), Engystomops petersi from Puyo (Targueta et al 2010), Physalaemus ephippifer (Nascimento et al 2010), it is the single cytogenetic characteristic that could be found to differentiate the sex chromosomes only in B. buergeri (Schmid et al 1993) and H. femoralis Wiley 2003). A possible role of ribosomal DNA in the first step of sex chromosome differentiation has been proposed by some authors (Reed and Phillips 1997;Cioffi et al 2010) and we could not discard the possibility that this repetitive DNA was also involved in the differentiation of the chromosomes of E. coloradorum.…”

Section: Discussionmentioning

confidence: 99%

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Karyotypic differentiation via 2n reduction and a finding of a case of triploidy in anurans of the genus Engystomops (Anura, Leiuperidae)

2011

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The genus Engystomops is divided into two groups, namely the Duovox clade and the Edentulus clade. The species of Edentulus clade have karyotypes with 2n = 22, while E. pustulatus and E. puyango, which belong to Duovox clade, have 2n = 20. To investigate if 2n = 20 is a synapomorphy of Duovox clade, we cytogenetically analyzed all the species of this group, except for E. puyango, in the present study. All of them had 2n = 20, differing from the species of Edentulus clade. Since the species already karyotyped of the genus Physalaemus, which is considered to be the sister group of Engystomops, also have 2n = 22, we conclude that the 2n reduction is a synapomorphy of Duovox clade. Despite the karyotypes of all the species of Duovox clade were very similar, they varied in the NOR pattern. In E. coloradorum, an additional NOR was found in one homologue of the chromosome pair 10 exclusively in all females, indicating that this could possibly be a sexual pair of the ZZ/ZW system. Also in this species, it was found the first case of natural polyploidy of the genus Engystomops.

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Section: Discussionsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 73%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Karyotypic differentiation via 2n reduction and a finding of a case of triploidy in anurans of the genus Engystomops (Anura, Leiuperidae)

2011

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“…Cytogenetic data are available for 29 of the 46 species of Physalaemus (Beçak, 1968;Beçak et al, 1970;Denaro, 1972;de Lucca et al, 1974;Silva et al, 1999Silva et al, , 2000Amaral et al, 2000;Lourenço et al, 2006;Ananias et al, 2007;Quinderé et al, 2009;Tomatis et al, 2009;Milani et al, 2010;Nascimento et al, 2010;Provete et al, 2012;Vittorazzi et al, 2014), and this set of data has already been explored by Tomatis et al (2009) and Vittorazzi et al (2014) in an attempt to evaluate the arrangement of the P. henselii and P. albifrons Groups as proposed by Nascimento et al (2005). Despite the notorious interspecific variation in the location of nucleolus organizer regions (NORs) in Physalaemus, the steps of karyotypic evolution in this genus and the recognition of chromosomal synapomorphies for species groups remain largely unknown (see comments in Tomatis et al, 2009 andVittorazzi et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Phylogeny of frogs from the genus Physalaemus (Anura, Leptodactylidae) inferred from mitochondrial and nuclear gene sequences

Lourenço

Targueta

Baldo

et al. 2015

Molecular Phylogenetics and Evolution

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130

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Although some species groups have been recognized in the leiuperine genus Physalaemus, no phylogenetic analysis has previously been performed. Here, we provide a phylogenetic study based on mitochondrial and nuclear DNA sequences from 41 of the 46 species of Physalaemus. We employed the parsimony criterion using the software TNT and POY and the Bayesian criterion using the software MrBayes. Two major clades were recovered inside the monophyletic Physalaemus: (i) the highly supported Physalaemus signifer Clade, which included P. nattereri and the species previously placed in the P. deimaticus and P. signifer Groups; and (ii) the Physalaemus cuvieri Clade, which included the remaining species of Physalaemus. Five species groups were recognized in the P. cuvieri Clade: the P. biligonigerus Group, the P. cuvieri Group, the P. henselii Group, the P. gracilis Group and the P. olfersii Group. The P. gracilis Species Group was the same as that previously proposed by Nascimento et al. (2005). The P. henselii Group includes P. fernandezae and P. henselii, and was the sister group of a clade that comprised the remaining species of the P. cuvieri Clade. The P. olfersii Group included P. olfersii, P. soaresi, P. maximus, P. feioi and P. lateristriga. The P. biligonigerus Species Group was composed of P. biligonigerus, P. marmoratus, P. santafecinus and P. riograndensis. The P. cuvieri Group inferred here differed from that recognized by Nascimento et al. (2005) only by the inclusion of P. albifrons and the exclusion of P. cicada. The paraphyly of P. cuvieri with respect to P. ephippifer was inferred in all the analyses. Distinct genetic lineages were recognized among individuals currently identified as P. cuvieri and they were congruent with cytogenetic differences reported previously, supporting the hypothesis of occurrence of formally unnamed species.

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Dynamics of vertebrate sex chromosome evolution: from equal size to giants and dwarfs

2015

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The Y and W chromosomes of mammals and birds are known to be small because most of their genetic content degenerated and were lost due to absence of recombination with the X or Z, respectively. Thus, a picture has emerged of ever-shrinking Ys and Ws that may finally even fade into disappearance. We review here the large amount of literature on sex chromosomes in vertebrate species and find by taking a closer look, particularly at the sex chromosomes of fishes, amphibians and reptiles where several groups have evolutionary younger chromosomes than those of mammals and birds, that the perception of sex chromosomes being doomed to size reduction is incomplete. Here, sex-determining mechanisms show a high turnover and new sex chromosomes appear repeatedly. In many species, Ys and Ws are larger than their X and Z counterparts. This brings up intriguing perspectives regarding the evolutionary dynamics of sex chromosomes. It can be concluded that, due to accumulation of repetitive DNA and transposons, the Y and W chromosomes can increase in size during the initial phase of their differentiation.

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Heteromorphic Z and W sex chromosomes in Physalaemus ephippifer (Steindachner, 1864) (Anura, Leiuperidae)

Cited by 24 publications

References 62 publications

Karyotypic differentiation via 2n reduction and a finding of a case of triploidy in anurans of the genus Engystomops (Anura, Leiuperidae)

Karyotypic differentiation via 2n reduction and a finding of a case of triploidy in anurans of the genus Engystomops (Anura, Leiuperidae)

Phylogeny of frogs from the genus Physalaemus (Anura, Leptodactylidae) inferred from mitochondrial and nuclear gene sequences

Dynamics of vertebrate sex chromosome evolution: from equal size to giants and dwarfs

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