Artículos de revistas
Targeted Nucleotide Exchange in Bovine Myostatin Gene
Fecha
2009-01-01Registro en:
Animal Biotechnology. Philadelphia: Taylor & Francis Inc, v. 20, n. 1, p. 15-27, 2009.
1049-5398
10.1080/10495390802594693
WOS:000262638300002
1892359871207408
9991374083045897
Autor
Universidade Estadual Paulista (Unesp)
Univ Delaware
Universidade Federal da Grande Dourados (UFGD)
Institución
Resumen
The myostatin gene, known as Growth Differentiation Factor 8 (GDF8), located at chromosome 2 (BTA2) in cattle, is specifically expressed during embryo development and in the adult skeletal muscle. Molecular analysis of this gene reveals the presence of three exons and two introns. Several cattle breeds, such as Piedmontese, Belgian Blue, Blond'Aquitaine, among others, show polymorphisms in this gene, which are directly related to double muscling phenotype. Piedmontese cattle shows a nucleotide transition GA (G938A) at exon 3, resulting in the substitution of cysteine to tyrosine, leading to a protein structure change, which determines myostatin inactivation and consequent muscular hypertrophy. The objective of this work was to implant the polymorphism G938A, naturally existent in Piedmontese breed, into in vitro propagated foetal myoblasts, from Nellore cattle. Single strand DNA (ssDNA) oligonucleotides were used to direct the same nucleotidic transition (G938A) to exon 3. Two transfection protocols (cationic lipid solution and electroporation) were tested and, 48 hours after transfection, RNA and DNA were extracted from myoblasts. Reverse transcription and polymerase chain reaction (PCR) were performed, using primers flanking the mutation region. The PCR products were cloned and analyzed by DNA sequencing, and it was possible to detect the nucleotidic CT transition at position 938, in the electroporated myoblasts. The existence of a positive signal in the transfection indicates that ssDNA oligonucleotides can be used to introduce this point mutation in specific functional gene sites.