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Evidence that rat platelet fibrinogen molecules lack the gamma' chain variant found in plasma fibrinogen molecules
Thrombosis Research
|July 15, 1985
Abstract:
Heterogeneity of rat plasma fibrinogen gamma chains (gamma A, gamma') is due to differential splicing of the primary mRNA transcript. Human gamma' chains, which amount to 7% of the total gamma chain population of plasma (hepatic) fibrinogen, are not detectable in fibrinogen isolated from platelets. In this investigation, we extended our studies to rats and found that gamma' chains, representing 30% of the rat plasma gamma chain population, are not detectable in their platelet fibrinogen.
Insights
Rat plasma fibrinogen exhibits gamma chain heterogeneity due to differential splicing. Unlike humans, rat platelet fibrinogen lacks gamma
Area of Science:
- Biochemistry
- Molecular Biology
- Hematology
Background:
- Fibrinogen heterogeneity in plasma arises from differential mRNA splicing.
- Human plasma fibrinogen contains gamma' chains (7% of total), absent in platelet fibrinogen.
- Rat plasma fibrinogen also shows gamma chain heterogeneity.
Purpose of the Study:
- To investigate the presence of gamma' chains in rat platelet fibrinogen.
- To compare rat fibrinogen heterogeneity with that of humans.
Main Methods:
- Analysis of plasma and platelet fibrinogen from rats.
- Characterization of fibrinogen gamma chain composition.
Main Results:
- Rat plasma fibrinogen contains a significant proportion (30%) of gamma' chains.
- Gamma' chains were undetectable in rat platelet fibrinogen.
- This contrasts with human platelet fibrinogen, where gamma' chains are also absent.
Conclusions:
- Rat platelet fibrinogen lacks gamma' chains, similar to human platelet fibrinogen.
- Differential splicing affects fibrinogen composition in both plasma and platelet forms.
- These findings highlight species-specific variations in fibrinogen processing.