ZZ/ZW sex chromosome system in the endangered fish Lignobrycon myersi Miranda-Ribeiro, 1956 (Teleostei, Characiformes, Triportheidae)
| Autor: | Claudio Oliveira, Débora Diniz, Aline Souza Medrado, Paulo Roberto Antunes de Mello Affonso, Alexandre dos Santos Rodrigues |
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| Přispěvatelé: | Dep. Ciências Biológicas, Universidade Estadual de Santa Cruz (UESC), Universidade Estadual Paulista (UNESP) |
| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
0301 basic medicine CharaciformesAnimalia Heterochromatin Evolution Triportheus sex determination Zoology rDNA Plant Science Characiformes 010603 evolutionary biology 01 natural sciences Female heterogamety Lignobrycon myersiAnimalia 03 medical and health sciences RDNA Genetics Animalia Triportheidae Chordata Research Articles Synapomorphy Teleostei Z chromosome female heterogamety biology Actinopterygii Chromosome Karyotype Lignobrycon Sex determination biology.organism_classification W chromosome 030104 developmental biology Animal Science and Zoology Biotechnology |
| Zdroj: | Comparative Cytogenetics 10(2): 245-254 Comparative Cytogenetics Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| Popis: | Made available in DSpace on 2022-04-28T19:05:28Z (GMT). No. of bitstreams: 0 Previous issue date: 2016-01-01 Lignobrycon myersi is an endemic fish species from a few coastal rivers in northeastern Brazil. Based on molecular evidence, L. myersi and genera Triportheus Cope, 1872, Agoniates Müller & Troschel, 1845, Clupeacharax Pearson, 1924 and Engraulisoma Castro, 1981 were placed in the family Triportheidae. In the present work, we report the first cytogenetic data for L. myersi to test the hypothesis that Lignobrycon and Triportheus are closely related. Studied specimens presented 2n=52 with 28 metacentric (m), 18 submetacentric (sm) and six subtelocentric (st) chromosomes for males and 27 m, 19 sm and 6 st for females, characterizing a ZZ/ZW sex chromosome system. The Z chromosome corresponds to the largest chromosome in karyotype while the W is about 50% smaller than the Z and largely heterochromatic. Terminal nucleolus organizer regions, GC-rich sites and 18S rDNA signals were detected on pair 14. However, additional 18S rDNA sites were observed in the W chromosome. The 5S rDNA was mainly detected on long arms of pair 7. The apparent synapomorphic chromosomal traits of Triportheus and L. myersi reinforce their close phylogenetic relationship, suggesting that the ZZ/ZW chromosome system in both genera has arisen before cladogenic events. Universidade Estadual do Sudoeste da Bahia (UESB) Dep. Ciências Biológicas, Av. José Moreira Sobrinho, s/n Universidade Estadual de Santa Cruz (UESC) Campus Soane Nazaré de Andrade, Rodovia Jorge Amado, Km 16 Universidade Estadual Paulista Instituto de Biociências Dep. Morfologia Universidade Estadual Paulista Instituto de Biociências Dep. Morfologia |
| Databáze: | OpenAIRE |
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