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Radioactive cDNA was synthesized from a bovine liver mRNA preparation enriched for fibrinogen mRNA activity. This cDNA was used in a solution hybridization assay to screen a collection of recombinant plasmids carrying bovine cDNA inserts. A number of plasmids containing cDNAs for fibrinogen were identified.  The nucleotide sequence of the insert of one plasmid, designated pBIβ1, has been determined. It contains 1372 base pairs and codes for the C-terminal 424 amino acids of the β chain of bovine fibrinogen. This and other previous-ly reported partial sequences enabled the construction of the complete amino acid sequence of the bovine β chain. Comparison of this sequence with that of the human β chain shows a high degree of homology. The positions of all the cystine and tryptophan residues are identical.  The nucleotide sequence of the insert of another plasmid, designated pBIα1, has also been determined. This plasmid contains 965 base pairs and codes for the C-terminal 203 amino acids of the bovine a chain. This region shows only 46% homology with the corresponding region in the human α chain. A hypervariable region, consisting of 53 amino acids, is present in the bovine a chain. This region shows little homology with the corresponding region in the human α chain. Furthermore, it is 26 amino acids shorter than the corresponding region in the human a chain.  The cDNAs to the bovine fibrinogen chains will provide good probes for the study of human fibrinogen and the organization and structure of its genomic DNA.

Characterization Of Cdna Clones Coding For The α And β Chains Of Bovine Fibrinogen