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A cDNA library prepared from human placenta has been screened for sequences coding for factor XIIIa, the enzymatically active subunit of the factor XIII complex that stabilizes blood clots through crosslinking of fibrin molecules. Two oligonucleotides, based on the amino acid sequences of tryptic peptides of factor XIIIa, were used as hybridization probes. Of 0.36 X 10(6) independent recombinants, 1 clone was identified that hybridized to both probes. The insert of 1704 base pairs coded for the amino-terminal 541 amino acid residues of the mature factor XIIIa molecule. Blot-hybridization analysis using this cDNA as a probe showed that the factor XIIIa mRNA from placenta has a size of approximately 4000 bases. The insert was used to rescreen cDNA libraries and to identify further factor XIIIa-specific sequences. The total length of the isolated factor XIIIa cDNA is 3905 bases, and it codes for a protein of 732 amino acids. In spite of the presence of factor XIII in blood plasma, we could not identify a leader sequence typical for secreted proteins.

Characterization of cDNA coding for human factor XIIIa.