Multiple sex-chromosome system and other karyological characterizations of Pterotrachea hippocampus (Mollusca: Mesogastropoda)

Vitturi, R.; Catalano, E.; Colombera, D.; Ávila, Alejandra; Fucà, A.

doi:10.1007/bf00349365

Cited by 14 publications

(7 citation statements)

References 23 publications

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“…These chromosomes could be sex chromosomes. Similarly, difference in karyotypes between sexes and evidence for sex chromosomes have been observed in other marine invertebrates [34-36]. These findings support the existence of chromosomal sex-determining systems in different lineages.…”

Section: Chromosomes and Genome Sizes Of Echinodermssupporting

confidence: 75%

Current Status of Echinoderm Genome Analysis - What do we Know?

Kondo

Akasaka

2012

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Echinoderms have long served as model organisms for a variety of biological research, especially in the field of developmental biology. Although the genome of the purple sea urchin Strongylocentrotus purpuratus has been sequenced, it is the only echinoderm whose whole genome sequence has been reported. Nevertheless, data is rapidly accumulating on the chromosomes and genomic sequences of all five classes of echinoderms, including the mitochondrial genomes and Hox genes. This blossoming new data will be essential for estimating the phylogenetic relationships among echinoderms, and also to examine the underlying mechanisms by which the diverse morphologies of echinoderms have arisen.

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Section: Chromosomes and Genome Sizes Of Echinodermssupporting

confidence: 75%

Current Status of Echinoderm Genome Analysis - What do we Know?

Kondo

Akasaka

2012

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“…Namely, mechanisms of the XO and XY types were described in the mesogastropod Littorina neritoides (Mollusca: Prosobranchia) and in the schyphomedusa Pelagia noctiluca (Coelenterata) (Vitturi et al 1994), respectively, while a multiple-chromosome sex system of the X1X2Yc~/X1X1X2X29 type was described in the heteropod Pterotrachea hippocampus (Mollusca: Mesogastropoda) (Vitturi et al 1993a). These data indicate the presence of heteromorphic sex chromosomes in different animal taxons which presumably originated independently.…”

Section: Discussionmentioning

confidence: 99%

Karyotype analysis of the sea urchinParacentrotus lividus (Echinodermata): evidence for a heteromorphic chromosome sex mechanism

et al. 1996

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A consistent diploid number of 2n = 36 was determined for the sea urchin Paracentrotus lividus from the Gulf of Palermo by analysis of mitotic chromosomes of both early developing embryos and male gonads. The haploid number n = 18 was determined by counts of spermatocyte bivalents at diakinesis. A heteromorphic chromosome sex mechanism of the XY type is likely present in this species. This is indicated by the occurrence of a chromosomal pair, pair No. 2, which is heteromorphic in both morphology and size in about 50% of the mitotic figures (metaphases and anaphases) of embryos. In addition, heteromorphism of the same pair of chromosomes occurred during spermatogonial metaphases in the five male specimens investigated here. The detection of a low chromosome number (2n--36) compared to other echinoids (2n = 42 to 44), a heteromorphic chromosome sex system and the involvement of three chromosome pairs in nucleolar organization (NORs) provide evidence of the specialization of the P. lividus karyotype.

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“…A multiple-chromosome sex mechanism of the X1X2Yo~/XIXIX2X2~ type has recently been described in the mollusc heteropod Pterotrachea hyppocampus (Vitturi et al, 1993). Three important points make this mechanism similar to those observed in Blaps: i) the occurrence of two types of spermatocyte metaphase-II spreads, one type including the Y and the other all the Xs; ii) the loss of one homologous chromosome in each X pair in the males; and iii) the presence of terminal Ag signals in all the components of the sex complex at spermatocyte metaphase-I.…”

Section: Blaps Gibbamentioning

confidence: 99%

Multiple-chromosome sex systems in the darkling beetles Blaps gigas and Blaps gibba (Coleoptera, Tenebrionidae)

et al. 1996

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We have studied mitotic and meiotic chromosomes in the males of two species of Blaps: B. gigas and B. gibba.Karyological characteristics such as the occurrence of a multivalent configuration at diakinesis and two types of metaphase-II spreads support the notion that multiple-chromosome sex systems involving five chromosomes in B.gigas and eight chromosomes in B. gibba have developed in these species. Results obtained by means of silver staining and C-banding techniques suggest that the complex sex systems occurring in B. gigas and B. gibba may have originated from exchanges of terminal ribosomal genes among the Y chromosome and some autosomes.

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Multiple sex-chromosome system and other karyological characterizations of Pterotrachea hippocampus (Mollusca: Mesogastropoda)

Cited by 14 publications

References 23 publications

Current Status of Echinoderm Genome Analysis - What do we Know?

Current Status of Echinoderm Genome Analysis - What do we Know?

Karyotype analysis of the sea urchinParacentrotus lividus (Echinodermata): evidence for a heteromorphic chromosome sex mechanism

Multiple-chromosome sex systems in the darkling beetles Blaps gigas and Blaps gibba (Coleoptera, Tenebrionidae)

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