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1.
J Anim Sci ; 73(5): 1282-8, 1995 May.
Artigo em Inglês | MEDLINE | ID: mdl-7665359

RESUMO

PIT1, a member of the POU-domain family of genes, is a positive regulatory factor of growth hormone, prolactin, and thyrotroph-stimulating hormone beta in several mammals. Therefore, PIT1 was chosen as a candidate gene to investigate its association with growth and carcass traits in pigs. The five Iowa State University reference/resource three-generation families consisting of crosses of Meishan x Duroc, Meishan x Hampshire, Meishan x Landrace, Minzhu x Hampshire, and Minzhu x Landrace were used. The three PIT1 polymorphisms were based on two RFLP using a PIT1 POU-domain cDNA probe and the restriction enzymes BamHI and MspI and a PCR/RFLP using RsaI. Birth, 21-d, and 42-d weights, average daily gain, several backfat measurements, longissimus muscle area, muscle color, marbling, and firmness scores were evaluated for their association with the three PIT1 polymorphisms. Mixed-animal-model analyses were used with the informative family data in which the PIT1 polymorphisms were segregating. Results from mixed-model analyses revealed that pigs with the MspI CC genotype (P < .01) were associated with heavier birth weight (.12 kg) than DD genotype pigs. The MspI CC genotype pigs were also significantly associated with greater average backfat (.41 cm, P < .01), greater first-rib backfat (.45 cm, P < .01), greater last-rib backfat (.32 cm, P < .07), and greater last lumbar backfat (.46 cm, P < .10) than the DD genotype pigs. The CC genotype represents primarily Chinese alleles and may be useful for future genetic improvement in synthetic lines involving Chinese and American pigs.(ABSTRACT TRUNCATED AT 250 WORDS)


Assuntos
Proteínas de Ligação a DNA/genética , Carne/normas , Polimorfismo Genético , Suínos/crescimento & desenvolvimento , Fatores de Transcrição/genética , Alelos , Animais , Cruzamento , Cruzamentos Genéticos , Feminino , Frequência do Gene , Variação Genética , Genótipo , Masculino , Suínos/genética , Fator de Transcrição Pit-1
7.
Anim Genet ; 25(4): 229-33, 1994 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-7985839

RESUMO

The swine PIT-1 POU domain cDNA was used to study PIT-1 expression and to clone the PIT-1 genomic region to identify additional PIT-1 polymorphisms. PIT-1 was expressed only in the pituitary, confirming the swine cDNA identity. To study the PIT-1 genomic region, a clone containing 13.7 kb DNA was isolated. EcoRI fragments hybridizing to PIT-1 were sequenced, and the 3' portion of PIT-1 gene identified. Primers for polymerase chain reaction (PCR)-restriction fragment length polymorphism (RFLP) analysis were then designed. Restriction analysis of PCR products identified a RsaI RFLP. In contrast to other PIT-1 RFLPs, the RsaI PCR-RFLP was widely distributed in American breeds. Thus, the RsaI RFLP and the previously reported PIT-1 RFLPs allow detection of PIT-1 alleles in most, if not all, breeds currently used in the US and European reference/resource pig mapping families.


Assuntos
Proteínas de Ligação a DNA/genética , Polimorfismo de Fragmento de Restrição , Suínos/genética , Fatores de Transcrição/genética , Animais , Sequência de Bases , Clonagem Molecular , Primers do DNA , Desoxirribonucleases de Sítio Específico do Tipo II , Feminino , Expressão Gênica , Masculino , Dados de Sequência Molecular , Linhagem , Reação em Cadeia da Polimerase , RNA Mensageiro/genética , Mapeamento por Restrição , Fator de Transcrição Pit-1
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