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Cloning and DNA sequence analysis of the cDNA for the precursor of ovine follicle stimulating hormone beta-subunit.

Clones coding for the 1-subunit of ovine follicle stimulating hormone (FSH) were selected from an ovine lamb pituitary A-gtIO cDNA library using two synthetic oligonucleotide probes. Both probes were synthetised on the basis of published amino acid sequence for the FSH ,B-subunit [1]. The complete DNA sequence for the ovine 1- FSH clone 6.14, determined by dideoxy sequence analysis [2] and exonuclease III digestion [3], is presented in Figure 1. The clone is 1589 base pairs in length and includes the entire coding region for a 129 amino acid FSH P-subunit prehormone. The signal peptide is 19 amino acids in length. When the predicted amino acid sequence is com-pared with that previously established by amino acid sequencing [1], four conservative substitutions and a single C-terminal amino acid exclusion were noted. The predicted amino acid sequence was confirmed by DNA sequencing of two independent cDNA clones. Comparison of the ovine nucleotide coding region sequence with the corresponding bovine sequence [4] gives an overali homology of 95%. Comparison of the entire ovine P-FSH cDNA clone 6.14, which includes a 149 bp 3' non-coding region inclusion, gives an overall homology of 85%. Subsequent sequence analysis of an additional 1-FSH cDNA clone has revealed an additional 3' extension of approximately 300 bp not seen in clone 6.14. The extension appears closely homologous to the equivalent pub- lished bovine nucleotide sequence.