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Genetic control of red cell osmotic fragility
The Journal of Heredity
|January 1, 1985
Summary
Genetic variation in mice reveals at least two genes control red blood cell osmotic fragility. These genes influence cell membrane properties, impacting susceptibility to lysis and ion transport.
Area of Science:
- Genetics
- Cell Biology
- Physiology
Background:
- Natural genetic variation in mouse strains provides models for studying cell membrane structure and function.
- Erythrocyte (red blood cell) osmotic fragility differs between C57BL/6J and DBA/2J mouse strains.
Purpose of the Study:
- To investigate the genetic basis of erythrocyte osmotic fragility differences between C57BL/6 and DBA/2 mice.
- To identify specific genes and loci influencing red blood cell membrane properties.
Main Methods:
- Analysis of serial backcross progeny and recombinant inbred (ri) strains (BXD).
- Examination of congenic C57BL/6 strains with allelic differences at Hbb (hemoglobin beta chain) or Fv-2 loci.
- Measurement of 51Cr uptake in erythrocytes from different mouse strains.
Main Results:
- Erythrocyte osmotic fragility differences are attributed to allelic variations at a minimum of two segregating loci.
- One locus may be linked to, but distinct from, the Hbb gene.
- Allelic differences at Fv-2 and Hba (hemoglobin alpha chain) genes do not significantly influence red cell osmotic fragility.
- Red cells from BXD-31 RI strain exhibit greater resistance than the DBA/2 parent, indicating complex gene interactions.
- Differences in 51Cr uptake between C57BL/6 and DBA/2 erythrocytes suggest roles for ion metabolism or membrane transport.
Conclusions:
- Erythrocyte osmotic fragility is a polygenic trait influenced by multiple genes with additive or opposing effects.
- Ion metabolism and membrane transport mechanisms may contribute to observed differences in red cell osmotic fragility.
- Further research into specific ion channels and transporters is warranted to elucidate red cell membrane regulation.
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