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We have generated complete complementary DNA (cDNA) sequences for the porcine steroidogenic acute regulatory protein (StAR) gene, using a combination of genomic PCR amplification and reverse transcription-PCR amplification of pig ovarian cDNA. Porcine StAR cDNA consists of 855 bp and shares 90.2%, 87.3%, 84.3%, and 83.9% homologies with bovine, human, mouse, and rat StAR cDNA at the nucleotide level, and 89.1%, 88.8%, 86.7%, and 86.3% homologies with bovine, human, mouse, and rat StAR protein at the deduced amino acid level. Northern analysis of porcine StAR showed that it is expressed in adult and fetal steroidogenic tissues, including adult testes and ovaries and adult adrenal glands as well as steroidogenic tissues of pregnancy, including developing fetal testes, corpus luteum, and pregnancy, but not the fetal ovary. Major hybridizing bands of 1.8 and 1.1 kilobases were demonstrated. In contrast to human StAR, porcine StAR was not expressed in adult or fetal kidneys. Expression of porcine StAR by the pig placenta is in contrast to human StAR, which is not expressed by the human placenta. Northern analysis of bovine cotyledons using a homologous probe for bovine StAR showed that StAR is also expressed by the placenta in the bovine animal. With respect to placental expression of StAR, variations may exist among mammalian species.

Porcine and Bovine Steroidogenic Acute Regulatory Protein (StAR) Gene Expression during Gestation1

Porcine and Bovine Steroidogenic Acute Regulatory Protein (StAR) Gene Expression during Gestation¹