RESUMO
Chromosome mapping and studies of the genomic organization of repetitive DNA sequences provide valuable insights that enhance our evolutionary and structural understanding of these sequences, as well as identifying chromosomal rearrangements and sex determination. This study investigated the occurrence and organization of repetitive DNA sequences in Leporinus elongatus using restriction enzyme digestion and the mapping of sequences by chromosomal fluorescence in situ hybridization (FISH). A 378-bp fragment with a 54.2% GC content was isolated after digestion with the SmaI restriction enzyme. BLASTN search found no similarity with previously described sequences, so this repetitive sequence was named LeSmaI. FISH experiments were conducted using L. elongatus and other Anostomidae species, i.e. L. macrocephalus, L. obtusidens, L. striatus, L. lacustris, L. friderici, Schizodon borellii, S. isognathus, and Abramites hypselonotus which detected signals that were unique to male and female L. elongatus individuals. Double-FISH using LeSmaI and 18S rDNA showed that LeSmaI was located in a nucleolus organizer region (NOR) in the male and female metaphases of L. elongatus. This report also discusses the role of repetitive DNA associated with NORs in the diversification of Anostomidae species karyotypes.
Assuntos
Caraciformes/genética , Genoma , Região Organizadora do Nucléolo/genética , Sequências Repetitivas de Ácido Nucleico/genética , Animais , Sequência de Bases , Southern Blotting , Mapeamento Cromossômico , Feminino , Hibridização in Situ Fluorescente , Masculino , Dados de Sequência Molecular , RNA Ribossômico 18S/genética , Análise de Sequência de DNA , Homologia de Sequência do Ácido NucleicoRESUMO
The Authors report their experience in the surgical management of 282 inguinal hernias classified according to Gilbert's classification. The different techniques used were compared analysing the results obtained in 104 patients operated with the Bassini hernioplasty, while in 120 cases the Lichteinstein tension-free repair and in 58 cases the Shouldice hernioplasty were performed. In the patients operated according to the Lichteinstein tension-free technique an Autosuture mesh was used. The Authors conclude that the Lichteinstein tension-free repair is preferable, not simply for the incidence, although low in this series, of recurrence observed with the Bassini hernioplasty, but particularly for the reduced postoperative pain, the fast return to full activities, the low cost, and the possibility to be performed in Day-Hospital.