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Ataxia telangiectasia heterozygotes and patients display increased fluidity and decrease in contents of sulfhydryl
M Rybczyńska1, A L Pawlak, E Sikorska
1Department of Clinical Chemistry, K. Marcinkowski University of Medical Sciences, Poznań, Poland.
Biochimica Et Biophysica Acta
|August 16, 1996
Summary
Red blood cell membranes show increased fluidity in individuals with ataxia telangiectasia mutated (ATM) gene mutations. This suggests the ATM gene impacts red blood cell precursors, with lasting effects on circulating cells.
Area of Science:
- Biochemistry
- Cell Biology
- Genetics
Background:
- Ataxia telangiectasia mutated (ATM) is a gene linked to various cellular functions.
- Red blood cell membrane properties can reflect underlying genetic conditions.
Purpose of the Study:
- To investigate the effects of ATM gene mutations on red blood cell membrane characteristics.
- To determine if ATM gene deficiency impacts red blood cell fluidity and microviscosity.
Main Methods:
- Analysis of corrected fluorescence anisotropy and anisotropy parameter in red blood cell membranes.
- Quantification of SH-groups, malondialdehyde (MDA), and glutathione (GSH) content.
Main Results:
- Decreased anisotropy values indicating increased red blood cell membrane fluidity and decreased microviscosity.
- Elevated malondialdehyde (MDA) levels and reduced SH-groups in both ATM homozygotes and heterozygotes.
- Reduced glutathione (GSH) content observed exclusively in ATM homozygotes.
Conclusions:
- ATM gene deficiency leads to significant alterations in red blood cell membrane fluidity.
- These membrane changes, particularly increased fluidity, are proportional to ATM gene mutation severity (homozygotes vs. heterozygotes).
- The ATM gene likely influences red blood cell precursors, causing persistent changes in mature circulating cells.