Objective: Monocyte Chemoattractant Protein-1 (MCP-1/CCL2), a key player in immune-mediated responses against Mycobacterium tuberculosis, is encoded by a polymorphic gene. Functionally relevant polymorphic variations in the MCP-1 gene have been associated with both susceptibility to and protection against tuberculosis-related disorders. Here, we investigated the potential impact of some of these polymorphisms on Pott's disease risk in a patient cohort from Algeria.
Methods: DNA from 132 Algerian patients with exclusive Pott's disease and 204 healthy controls, included under a case-control design, were analyzed for the MCP1 -2518A/G (rs1024611), -362G/C (rs2857656) and int1del554-567 (rs3917887) polymorphisms. PHASE software was used for haplotype reconstruction. Genetic associations were examined using chi-square tests.
Results: We found that the rs1024611 -2518 GG, rs2857656 -362 CC and rs3917887 int1del554-567 del/del homozygous genotypes each were significantly more prevalent in patients than in controls (respective corrected p value [Pc]=0.01, 0.04 and 0.04) Haplotype distribution profile further confirmed this, as the homozygous combination of GCdel haplotype was also found with raised susceptibility to Pott's disease (Pc=0.03).
Conclusion: Our findings confirm and replicate the recent data from China (which dealt essentially with rs1024611 and rs2857656) and also reinforce them by providing trans-ethnic evidence and extending the genetic association to the rs3917887.
Keywords: MCP-1; Polymorphism; Pott’s disease; Spinal tuberculosis.
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