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Familial pulmonary Mycobacterium avium complex disease
E Tanaka1, T Kimoto, H Matsumoto
1Departments of Infectious Diseases and Respiratory Medicine, Kyoto University Hospital, Kyoto, Japan.
Summary
Genetic defects may predispose individuals to pulmonary Mycobacterium avium complex (MAC) disease. However, mutations in the NRAMP1 gene were not found to be the cause in these Japanese families.
Area of Science:
- Genetics
- Immunology
- Infectious Diseases
Background:
- Pulmonary Mycobacterium avium complex (MAC) disease can affect families.
- Investigating genetic factors for MAC susceptibility is crucial.
Observation:
- Two Japanese families with familial pulmonary MAC disease were studied.
- Patients presented with peripheral nodules and bronchiectasis on CT scans.
- MAC strains isolated were not epidemiologically related.
Findings:
- A nonconservative missense mutation in the NRAMP1 gene was identified in one patient, but it was heterozygous and not present in their affected sibling.
- No NRAMP1 variations similar to those in MAC-susceptible mice were found.
- The study suggests a genetic defect in host defense, but not in the NRAMP1 coding region, underlies MAC susceptibility.
Implications:
- The findings suggest a genetic basis for pulmonary MAC disease susceptibility.
- Alterations in the NRAMP1 gene coding region do not explain the observed susceptibility.
- Further research is needed to identify the specific genetic factors involved in MAC disease pathogenesis.