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Ethnic-specific genetic associations with pulmonary tuberculosis
Julio C Delgado1, Andres Baena, Sok Thim
1Center for Blood Research and Departments of Pathology, Brigham and Women's Hospital, Boston, Massachusetts 02115, USA.
The Journal of Infectious Diseases
|October 31, 2002
Summary
Genetic factors influence tuberculosis (TB) progression. Specific variations in the Interleukin-10 (IL-10) and Natural Resistance-Associated Macrophage Protein 1 (NRAMP1) genes were linked to TB susceptibility and resistance in a Cambodian population.
Area of Science:
- Immunogenetics
- Infectious Disease Epidemiology
- Human Genetics
Background:
- Genetic polymorphisms are investigated for their role in differential susceptibility to tuberculosis (TB) disease progression.
- Understanding host genetic factors is crucial for explaining varying TB outcomes across populations.
Purpose of the Study:
- To evaluate specific genetic polymorphisms in Cambodian individuals for their association with pulmonary tuberculosis (TB) susceptibility and resistance.
- To identify ethnic-specific genetic factors influencing TB disease progression.
Main Methods:
- Genotyping of polymorphisms in the Natural Resistance-Associated Macrophage Protein 1 (NRAMP1), vitamin D receptor, tumor necrosis factor-alpha, Interleukin-1 (IL-1), and IL-10 genes.
- Case-control study involving 358 Cambodian pulmonary TB patients and 106 tuberculin-positive controls.
Main Results:
- Heterozygosity for the IL-10 promoter -1082 polymorphism was associated with increased TB susceptibility.
- Heterozygosity for linked NRAMP1 variants (D543N and 3' untranslated region) was associated with TB resistance.
- Other evaluated polymorphisms did not show significant associations with TB susceptibility or resistance in this cohort.
Conclusions:
- The study identified a unique pattern of genetic associations with TB susceptibility and resistance in the Cambodian population.
- These findings suggest that unique environmental and selective factors contribute to ethnic-specific host genetic factors influencing TB worldwide.