Banca de DEFESA: KARLLA DANIELLE JORGE AMORIM

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : KARLLA DANIELLE JORGE AMORIM
DATE: 13/03/2020
TIME: 09:00
LOCAL: Sala de Reuniões do Centro de Biociências
TITLE:

Cytogenomic diversification in Serranidae (Perciformes), a model of karyotype stasis: Evolutionary and applied aspects


KEY WORDS:

Groupers, karyotype evolution, interspecific hybridization, repetitive DNA, karyotype stasis


PAGES: 99
BIG AREA: Ciências Biológicas
AREA: Genética
SUBÁREA: Genética Animal
SUMMARY:

The Serranidae family, whose representatives are known as groupers, is one of the most diverse groups of fish in reef environments. They are efficient predators that can occupy everywhere from tide pools to deep reefs. Some species can reach considerable size and, in general, significant economic value. With a circunglobal distribution, the group consists of 577 species, distributed in 75 genera, of which Epinephelus is the most representative. Despite the growing set of genetic information, less than 10% of species have known cytogenetic aspects. Cytogenetic approaches to the family are dissociated in terms of their phylogenetic, geographical and taxonomic aspects, limiting the understanding of their evolutionary aspects and applied to management. Thus, aiming at a broader estimate of the chromosomal evolution of this family and obtaining data applied to management, conventional cytogenetic analyzes and fluorescent in situ hybridization mapping of the DNAr 18S, DNAr 5S sequences, transposable elements Tol2 and Rex3, microsatellites (CA) were performed 15, (GA) 15, (CAA) 10 and (CGG) 10, and telomeric sequences (TTAGGG) n, in the species Epinephelus coioides, E. sexfasciatus, E. erythrurus, E. tauvina, E. coeruleopunctatus, E. adscensionis, E. itajara, E. striatus, Cephalopholis formosa, C. fulva and Rypticus saponaceus. All species presented 2n = 48, of which only three have karyotypes not composed exclusively of acrocentric elements. Karyotypical conservatism, only disturbed by pericentric inversions, extends to the organization of repetitive DNA, where DNAr 18S and 5S sites reflect a low evolutionary dynamism, combined with arrangements of other essentially similar repetitive sequences. The cytogenetic and genomic divergence between species due to common ancestry that occurred in periods from 15 to 11 M.a apparently provides a reduced level of post-zygotic reproductive block, with valuable implications for the hybridization induced in aquaculture. From a biogeographic and phylogenetic perspective, the most basal groups in the Atlantic demonstrate 2n = 48a as the ancestral pattern for the family, indicating that speciation in the group was not followed by significant karyotype changes and despite a relative frequency of divergent karyotypes, this group of fish is adapted to an evolutionary pattern of karyotype stasis.


BANKING MEMBERS:
Externo à Instituição - CLÓVIS COUTINHO DA MOTTA NETO - SGB
Externo à Instituição - LUIZ ANTONIO CARLOS BERTOLLO - UFSCAR
Externo à Instituição - MARCELO DE BELLO CIOFFI - UFSCAR
Externo à Instituição - PAULO AUGUSTO DE LIMA FILHO - IFRN
Presidente - 1199139 - WAGNER FRANCO MOLINA
Notícia cadastrada em: 27/02/2020 12:54
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