Investigação das mutações responsáveis pela doença de acúmulo de glicogênio tipo II e pela miastenia hereditária em bovinos da raça Brahman no Brasil
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Data
2017-11-01
Autores
Trecenti, Anelize de Souza
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
A doença de acúmulo de glicogênio tipo II (GSD-II) e a síndrome miastênica congênita (CMS) são enfermidades autossômicas recessivas importantes no gado Brahman. Nenhum estudo avaliou previamente a prevalência de mutações responsáveis pelo GSD II (E7, c.1057_1058delTA e E13, c.1783C> T) ou CMS (CHRNE, c.470del20) nos bovinos Brahman brasileiro. O objetivo deste estudo foi investigar a presença dessas mutações em 276 amostras de bulbos pilosos de bovinos PO brasileiros e em 35 amostras de sêmen de touros da raça Brahman, rotineiramente utilizadas em programas de melhoramento genético no Brasil. Dos 276 bovinos Brahman testados, 7,3% foram identificados como heterozigotos para E7. Enquanto, todos os bovinos Brahman estudados eram wild-type para E13. Para as amostras de sêmen foi identificado 8,6% (3/35) heterozigotos para a E7 e para a E13 nenhum animal foi identificado. A mutação CHRNE, 0,73% das amostras de bulbo piloso são heterozigotos, enquanto para as amostras de sêmen, nenhum animal foi considerado heterozigoto. Este resultado indica que as mutações E7 e CHRNE estão presentes no rebanho Brahman brasileiro, e medidas de controle devem ser adotadas para evitar um aumento na incidência de GSD-II e CMS no gado Brahman no Brasil.
Glycogen storage disease type II (GSD-II) and congenital myasthenic syndrome (CMS) are important autosomal recessive disorders in Brahman cattle. No study has previously evaluated the prevalence of mutations responsible for GSD II (E7, c.1057_1058delTA; and E13, c.1783C>T) or CMS (CHRNE, c.470del20) in Brazilian Brahman cattle. The objective of this study was to investigate the presence of these mutations in 276 hair roots from purebred Brazilian Brahman cattle and in 35 semen samples from purebred Brahman bulls that were routinely used in breeding programmes in Brazil. Of the 276 Brahman cattle tested, 7.3% were identified as heterozygous for E7. All Brahman cattle studied were homozygous for the wild-type E13 allele. The E7 mutations was identified as heterozygous in 8.6% (3/35) of the commercial semen samples, whereas the E13 mutations was not identified. The CHRNE mutation was identified as heterozygous in 0.73% of the hair root samples, but this mutation was not present in any semen sample assessed. In summary, the E7 and CHRNE mutations are present in the Brazilian Brahman herd, and control measures should be adopted to prevent an increase in the incidence of GSD-II and CMS in Brahman cattle in Brazil.
Glycogen storage disease type II (GSD-II) and congenital myasthenic syndrome (CMS) are important autosomal recessive disorders in Brahman cattle. No study has previously evaluated the prevalence of mutations responsible for GSD II (E7, c.1057_1058delTA; and E13, c.1783C>T) or CMS (CHRNE, c.470del20) in Brazilian Brahman cattle. The objective of this study was to investigate the presence of these mutations in 276 hair roots from purebred Brazilian Brahman cattle and in 35 semen samples from purebred Brahman bulls that were routinely used in breeding programmes in Brazil. Of the 276 Brahman cattle tested, 7.3% were identified as heterozygous for E7. All Brahman cattle studied were homozygous for the wild-type E13 allele. The E7 mutations was identified as heterozygous in 8.6% (3/35) of the commercial semen samples, whereas the E13 mutations was not identified. The CHRNE mutation was identified as heterozygous in 0.73% of the hair root samples, but this mutation was not present in any semen sample assessed. In summary, the E7 and CHRNE mutations are present in the Brazilian Brahman herd, and control measures should be adopted to prevent an increase in the incidence of GSD-II and CMS in Brahman cattle in Brazil.
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Palavras-chave
Gado Brahman, síndrome miastênica congênita, Doença de Pompe, Brasil, Brahman cattle, Congenital myasthenic syndrome, Pompe Disease, Brazil