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. 1983 Jul;80(13):3953–3957. doi: 10.1073/pnas.80.13.3953

Partial mRNA sequences for human A alpha, B beta, and gamma fibrinogen chains: evolutionary and functional implications.

J A Kant, S T Lord, G R Crabtree
PMCID: PMC394177  PMID: 6575389

Abstract

Using rat cDNA and genomic probes to screen a human liver cDNA library, we have isolated clone of 2,274, 855, and 736 base pairs (bp) coding for the A alpha, B beta and gamma chains of human fibrinogen. Sequence analysis reveals a hitherto unrecognized extension of 15 amino acids at the carboxyl terminus of the A alpha chain, the terminal residue of which is proline. This brings the known length of the human A alpha chain to 625 amino acids. The 13-amino-acid repeated region in the midportion of the A alpha chain clearly has arisen through an 8-fold duplication of a 39-bp genetic element, which itself appears to have been constructed from smaller 6-bp repeating units. Greater than 50% sequence homology between B beta- and gamma-chain coding regions confirms postulates that these genes have arisen by duplication and subsequent divergence of an ancestral gene. A comparison of human and rat gamma-chain cDNAs shows more than 88% sequence homology over the carboxyl-terminal 162 amino acids, implying strong selective pressures on these portions of the gamma-chain gene.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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