Karyotypes in four species of the family cottidae

“…Ida and Yunokawa, (1980) examined 5 species in the family Platycephalidae and also found the new arm number to be 48. Ida et al (1982Ida et al ( , 1989 later examined 8 species of Sebastes (Scorpaenidae) and 4 species in the family Cottidae, finding the new arm number to be 48 in all the species. Thus most species in the order Scorpaeniformes have a new arm number of 48.…”

Section: Discussionmentioning

confidence: 99%

Karyotypes of three species of the family Cottidae (Scorpaeniformes)

Terashima¹,

Ida²

1991

Jap. Jour. Ich.

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Karyotypes and cellular DNA contents of three species of the family Cottidae viz. Icelus cataphractus, Gymnocanthus intermedius and Alcichthys alcicornis were analyzed. Structural modifications within the family were supposedly by Robertsonian translocations. The diploid chromosome numbers were determined to be 48 in Alcichthys alcicornis, 44 in Gymnocanthus intermedius and 40 in Icelus cataphractus. The DNA contents ranged from 1.46 to 1.50pg/cell in the three species. The karyotype of Icelus cataphractus is unique in having the smallest chromosome number (2n=40) and 14 large-sized chromosomes. From the chromosome number and the existence of some large chromosome pairs, Robertsonian translocations seem to have occurred frequently in Icelus cataphractus and Gymnocanthus intermedius.

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“…fasciatus and R . kazika have a diploid chromosome number of 40, whereas the other cottid species have 48 or 52 chromosomes (Abe, 1976; Chen et al, 1984; Goto et al, 2020; Ida et al, 1989). These karyotypic changes may have played an important role in the evolution and speciation of the catadromous T .…”

Section: Introductionmentioning

confidence: 99%

“…Karyotype evolution has been thought to be a major driver of speciation and differentiation of clades within teleosts (Auvinet et al, 2020), mice (Britton-Davidian et al, 2000), reptile (King, 1984) and angiosperm (Baltisberger & Hörandl, 2016). Both T. fasciatus and R. kazika have a diploid chromosome number of 40, whereas the other cottid species have 48 or 52 chromosomes (Abe, 1976;Chen et al, 1984;Goto et al, 2020;Ida et al, 1989). These karyotypic changes may have played an important role in the evolution and speciation of the catadromous T. fasciatus and R. kazika (Auvinet et al, 2020;Damas et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

A high‐quality chromosome‐level genome of the endangered roughskin sculpin provides insights into its evolution and adaptation

Xue

Xing

Liu

2022

Molecular Ecology Resources

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The cottids (Cottidae) are a taxonomically diverse and ecologically important component of many marine and freshwater ecosystems. Despite recent breakthroughs in long-read sequencing, high quality genomic resources are still limited for studies of ecological and evolutionary processes in cottids. Here, we generated a high-quality, chromosome-scale genome assembly (521.26 Mb) of the catadromous roughskin sculpin (Trachidermus fasciatus Heckel) with a contig N50 of 2.93 Mb and a scaffold N50 of 24.06 Mb. Approximately 21.97% of the genome was composed of repetitive elements. A total of 21,872 protein-coding genes were predicted, of which 19,900 genes (90.98%) were functionally annotated. Phylogenetic analysis supported the validity of Scorpaenoidei and Cottioidei as two suborders of the Perciformes. Chromosomescale collinearity analyses identified four chromosome fusions leading to the reduction of chromosome number in T. fasciatus. Gene families related to cell apoptosis and cell death were expanded and those related to immune system were contracted, suggesting that these gene families might be relevant to a host of phenotypic differences between T. fasciatus and other teleosts. Gene families associated with osmoregulation were also expanded, which might be associated with its catadromous life history. A total of 50 aging-associated genes were found to be under positive selection, which might be associated with the short lifespan of T. fasciatus. The high-quality genome assembly and annotation will promote researches into the evolution of catadromous life history and short lifespan for T. fasciatus and facilitate comparative genomic studies of cottids in the near future.

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Karyotypes in four species of the family cottidae

Cited by 6 publications

References 3 publications

Fish Karyotypes

Fish Karyotypes

Karyotypes of three species of the family Cottidae (Scorpaeniformes)

A high‐quality chromosome‐level genome of the endangered roughskin sculpin provides insights into its evolution and adaptation

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