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Serum amyloid A and P protein genes in familial Mediterranean fever
M Shohat1, T Shohat, J I Rotter
1Department of Pediatrics, Cedars-Sinai Medical Center, Los Angeles, CA 90048.
Abstract:
Two recent studies have suggested the involvement of serum amyloid A (SAA) and P (APCS) genes in familial Mediterranean fever (MEF). To test the role of SAA and APCS in MEF and MEF-amyloidosis, we studied 17 informative families (15 Armenians, 2 non-Ashkenazi Jews) and 8 MEF patients with amyloidosis using a candidate gene approach. No evidence for any MEF-associated polymorphism was found in any of the 41 Armenian and Jewish MEF patients tested. Our family studies allowed us to rule out tight linkage between SAA and MEF (lod score = -2.16, theta less than or equal to 0.06). For APCS we found that the allele frequency in the MEF-amyloidosis patients was similar to that in 18 unrelated MEF patients without amyloidosis and their 33 healthy parents. Finally, we excluded close genetic linkage between APCS and MEF at 8.5 cM or less (lod score = -2.2).
Insights
This study investigated serum amyloid A (SAA) and P (APCS) genes in familial Mediterranean fever (MEF). Researchers found no evidence linking these genes to MEF or MEF-amyloidosis in Armenian and Jewish populations.
Area of Science:
- Genetics
- Immunology
- Rheumatology
Background:
- Familial Mediterranean fever (MEF) is a genetic autoinflammatory disorder.
- Previous studies suggested potential roles for serum amyloid A (SAA) and apolipoprotein C (APCS) genes in MEF pathogenesis.
- Amyloidosis is a common complication of MEF, leading to organ damage.
Purpose of the Study:
- To investigate the potential involvement of SAA and APCS genes in the development of MEF and MEF-associated amyloidosis.
- To analyze genetic variations and linkage in Armenian and Jewish populations with MEF.
Main Methods:
- Candidate gene approach was utilized.
- Genetic analysis was performed on 17 informative families and 8 MEF patients with amyloidosis.
- Linkage analysis and allele frequency comparisons were conducted for SAA and APCS genes.
Main Results:
- No MEF-associated polymorphisms were identified in SAA or APCS genes in 41 MEF patients.
- Tight linkage between SAA and MEF was ruled out (lod score = -2.16).
- APCS allele frequencies were similar in MEF-amyloidosis patients and controls, excluding close genetic linkage (lod score = -2.2).
Conclusions:
- The study provides no evidence for the involvement of SAA and APCS genes in MEF or MEF-amyloidosis in the studied populations.
- These findings suggest that SAA and APCS are unlikely to be major susceptibility genes for MEF.
- Further research may be needed to identify other genetic factors contributing to MEF and its complications.