The key role of repeated DNAs in sex chromosome evolution in two fish species with ZW sex chromosome system

CIOFFI, Marcelo de Bello, Eduard KEJNOVSKÝ, Vinicius MARQUIONI, Juliana POLTRONIERI, Wagner Franco MOLINA, Debora DINIZ and Luiz Antonio Carlos BERTOLLO. The key role of repeated DNAs in sex chromosome evolution in two fish species with ZW sex chromosome system. MOLECULAR CYTOGENETICS. LONDON: BIOMED CENTRAL LTD, 2012, vol. 5, Jun, p. "nestránkováno", 7 pp. ISSN 1755-8166. Available from: https://dx.doi.org/10.1186/1755-8166-5-28.

Basic information

• Original name: The key role of repeated DNAs in sex chromosome evolution in two fish species with ZW sex chromosome system
• Authors: CIOFFI, Marcelo de Bello (76 Brazil), Eduard KEJNOVSKÝ (203 Czech Republic, guarantor, belonging to the institution), Vinicius MARQUIONI (76 Brazil), Juliana POLTRONIERI (76 Brazil), Wagner Franco MOLINA (76 Brazil), Debora DINIZ (76 Brazil) and Luiz Antonio Carlos BERTOLLO (76 Brazil).
• Edition: MOLECULAR CYTOGENETICS, LONDON, BIOMED CENTRAL LTD, 2012, 1755-8166.

Other information

• Original language: English
• Type of outcome: Article in a journal
• Field of Study: Genetics and molecular biology
• Country of publisher: United Kingdom of Great Britain and Northern Ireland
• Confidentiality degree: is not subject to a state or trade secret
• WWW: URL
• Impact factor: Impact factor: 2.360
• RIV identification code: RIV/00216224:14740/12:00058667
• Organization unit: Central European Institute of Technology
• Doi: http://dx.doi.org/10.1186/1755-8166-5-28
• UT WoS: 000309748100001
• Keywords in English: Microsatellites; Sex chromosome evolution; Heterochromatin; Fish; ZW systems
• Tags: ok, rivok
• Tags: International impact, Reviewed

Abstract

Despite substantial progress, there are still several gaps in our knowledge about the process of sex chromosome differentiation. The degeneration of sex-specific chromosome in some species is well documented, but it is not clear if all species follow the same evolutionary pathway. The accumulation of repetitive DNA sequences, however, is a common feature. To better understand this involvement, fish species emerge as excellent models because they exhibit a wide variety of sex chromosome and sex determining systems. Besides, they have much younger sex chromosomes compared to higher vertebrates, making it possible to follow early steps of differentiation. Here, we analyzed the arrangement of 9 repetitive DNA sequences in the W chromosomes of 2 fish species, namely Leporinus reinhardti and Triportheus auritus, which present well-differentiated ZZ/ZW sex system, but differ in respect to the size of the sex-specific chromosome. Both W chromosomes are almost fully heterochromatic, with accumulation of repeated DNAs in their heterochromatic regions. We found that microsatellites have strongly accumulated on the large W chromosome of L. reinhardti but not on the reduced-size W chromosome of T. auritus and are therefore important players of the W chromosome expansion. The present data highlight that the evolution of the sex chromosomes can diverge even in the same type of sex system, with and without the degeneration of the specific-sex chromosome, being more dynamic than traditionally appreciated.

Links

• ED1.1.00/02.0068, research and development project: Name: CEITEC - central european institute of technology
• GBP501/12/G090, research and development project: Name: Evoluce a funkce komplexních genomů rostlin