Laboratory investigations revealed a miliary pattern on chest radiography, and cerebrospinal fluid analysis showed an adenosine deaminase (ADA) level of 14.4 U/L, a total cell count of 110/mm3, glucose of 6 mg/dL, and protein of 228.4 mg/dL, supporting the diagnosis of TBM. The gene discussed is ADA; the disease is meningeal tuberculosis.