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Rodrigues Ados S, Medrado AS, Diniz D, et al. ZZ/ZW sex chromosome system in the endangered fish Lignobrycon myersi Miranda-Ribeiro, 1956 (Teleostei, Characiformes, Triportheidae). Comp Cytogenet. 2016;10(2):245-54doi: 10.3897/CompCytogen.v10i2.8435.
Rodrigues, A. d. o. s. . S., Medrado, A. S., Diniz, D., Oliveira, C., & Affonso, P. R. (2016). ZZ/ZW sex chromosome system in the endangered fish Lignobrycon myersi Miranda-Ribeiro, 1956 (Teleostei, Characiformes, Triportheidae). Comparative cytogenetics, 10(2), 245-54. https://doi.org/10.3897/CompCytogen.v10i2.8435
Rodrigues, Alexandre Dos Santos, et al. "ZZ/ZW sex chromosome system in the endangered fish Lignobrycon myersi Miranda-Ribeiro, 1956 (Teleostei, Characiformes, Triportheidae)." Comparative cytogenetics vol. 10,2 (2016): 245-54. doi: https://doi.org/10.3897/CompCytogen.v10i2.8435
Rodrigues Ados S, Medrado AS, Diniz D, Oliveira C, Affonso PR. ZZ/ZW sex chromosome system in the endangered fish Lignobrycon myersi Miranda-Ribeiro, 1956 (Teleostei, Characiformes, Triportheidae). Comp Cytogenet. 2016 May 18;10(2):245-54. doi: 10.3897/CompCytogen.v10i2.8435. eCollection 2016. PMID: 27551346; PMCID: PMC4977800.
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Comp Cytogenet. 2016 May 18;10(2):245-54. doi: 10.3897/CompCytogen.v10i2.8435. eCollection 2016.

ZZ/ZW sex chromosome system in the endangered fish Lignobrycon myersi Miranda-Ribeiro, 1956 (Teleostei, Characiformes, Triportheidae).

Comparative cytogenetics

Alexandre Dos Santos Rodrigues, Aline Souza Medrado, Débora Diniz, Claudio Oliveira, Paulo Roberto Antunes de Mello Affonso

Affiliations

  1. Universidade Estadual do Sudoeste da Bahia (UESB), Dep. Ciências Biológicas, Av. José Moreira Sobrinho, s/n, 45206-190 Jequié, BA, Brazil.
  2. Universidade Estadual de Santa Cruz (UESC), Campus Soane Nazaré de Andrade, Rodovia Jorge Amado, Km 16, 45662-900 Ilhéus, BA, Brazil.
  3. Universidade Estadual Paulista, Instituto de Biociências, Dep. Morfologia, 18618-000 Botucatu, SP, Brazil.

PMID: 27551346 PMCID: PMC4977800 DOI: 10.3897/CompCytogen.v10i2.8435

Abstract

Lignobrycon myersi is an endemic fish species from a few coastal rivers in northeastern Brazil. Based on molecular evidence, Lignobrycon 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 Lignobrycon 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 Lignobrycon myersi reinforce their close phylogenetic relationship, suggesting that the ZZ/ZW chromosome system in both genera has arisen before cladogenic events.

Keywords: Evolution; Triportheus; female heterogamety; rDNA; sex determination

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