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Inheritance of mixed cryoglobulinemia
American Journal of Human Genetics
|September 1, 1981
Summary
This study identifies an inherited form of essential mixed cryoglobulinemia within a three-generation family, suggesting a genetic basis for the condition. Clinical symptoms varied among affected members, highlighting the diverse presentation of inherited cryoglobulinemia.
Area of Science:
- Immunology
- Genetics
- Rheumatology
Background:
- Cryoglobulinemia is a condition characterized by the presence of cryoglobulins in the blood.
- Essential mixed cryoglobulinemia (EMC) is diagnosed when no underlying condition causes cryoglobulinemia.
- The genetic basis and inheritance patterns of EMC remain largely unknown.
Observation:
- A family spanning three generations exhibited IgM-IgG cryoglobulinemia.
- The affected individuals showed an autosomal dominant inheritance pattern.
- No secondary causes for cryoglobulinemia were identified in any family member.
Findings:
- The study found no linkage between cryoglobulinemia and HLA-A, HLA-B, blood group antigens, or immunoglobulin Gm allotypes.
- Rheumatoid factors in affected individuals reacted with some human IgG but were not antibodies to known Gm or Km allotypes.
- This family provides evidence for an inherited form of essential mixed cryoglobulinemia.
Implications:
- Essential mixed cryoglobulinemia can be inherited, challenging previous assumptions about its etiology.
- The clinical manifestations of inherited cryoglobulinemia can be heterogeneous among family members.
- Further research into the genetic factors underlying inherited cryoglobulinemia is warranted.