Association of a PD-L2 Gene Polymorphism with Chronic Lymphatic Filariasis in a South Indian Cohort

Gopinath Venugopal Centre for Infection Medicine, Institute of Immunology, Freie Universität Berlin, Berlin, Germany;

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Noëlle L. O’Regan Centre for Infection Medicine, Institute of Immunology, Freie Universität Berlin, Berlin, Germany;

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Subash Babu National Institutes of Health, National Institute of Research in Tuberculosis (NIRT), International Centre for Excellence in Research, Chennai, India;

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Ralf R. Schumann Institute for Microbiology and Hygiene, Charité–Universitätsmedizin Berlin, Berlin, Germany;

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Aparna Srikantam Blue Peter Public Health and Research Centre, LEPRA Society, Hyderabad, India;

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Roswitha Merle Department of Veterinary Medicine, Institute for Veterinary Epidemiology and Biostatistics, Freie Universität Berlin, Berlin, Germany;

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Susanne Hartmann Centre for Infection Medicine, Institute of Immunology, Freie Universität Berlin, Berlin, Germany;

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Svenja Steinfelder Centre for Infection Medicine, Institute of Immunology, Freie Universität Berlin, Berlin, Germany;
Department of Neural Circuits and Behavior, Max Delbrück Center for Molecular Medicine, Berlin, Germany

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Lymphatic filariasis (LF) is a parasitic infection, caused by three closely related nematodes, namely Wuchereria bancrofti, Brugia malayi, and Brugia timori. Previously, we have shown that lysate from B. malayi microfilariae induces the expression of interleukin (IL)-10 and programmed death-ligand (PD-L) 1 on monocytes, which lead to inhibition of CD4+ T-cell responses. In this study, we investigated associations of IL-10 and programmed cell death (PD)-1 pathway gene polymorphisms with clinical manifestation in LF. We evaluated the frequency of alleles and genotypes of IL-10 (rs3024496, rs1800872), IL-10RA (rs3135932), IL-10RB (rs2834167), PD-1 (rs2227982, rs10204525), PD-L1 (rs4143815), PD-L2 (rs7854413), and single-nucleotide polymorphisms (SNPs) in 103 patients with chronic pathology (CP), such as elephantiasis or hydrocele and 106 endemic normal (EN) individuals from a South Indian population living in an area endemic for LF. Deviations from the Hardy–Weinberg equilibrium were tested, and we found a significant difference between the frequency of polymorphisms in PD-L2 (rs7854413; P < 0.001) and IL-10RB (rs2834167; P = 0.012) between the CP and the EN group, whereas there were no significant differences found among IL-10, IL-10RA, PD-1, and PD-L1 SNPs. A multivariate analysis showed that the existence of a CC genotype in PD-L2 SNP rs7854413 is associated with a higher risk of developing CP (OR: 2.942; 95% confidence interval [CI]: 0.957–9.046; P = 0.06). Altogether, these data indicate that a genetically determined individual difference in a non-synonymous missense SNP of PD-L2 might influence the susceptibility to CP.

Author Notes

Address correspondence to Svenja Steinfelder, Department of Neural Circuits and Behavior, Max Delbrück Center for Molecular Medicine, NWFZ, Charitéplatz 1, Berlin 10117, Germany. E-mail: svenja.steinfelder@mdc-berlin.de

Authors’ addresses: Gopinath Venugopal, Noëlle L. O’Regan, and Susanne Hartmann, Centre for Infection Medicine, Institute of Immunology, Freie Universität Berlin, Berlin, Germany, E-mails: gopinath.v@fu-berlin.de, noelleoregan@gmail.com, and susanne.hartmann@fu-berlin.de. Subash Babu, National Institutes of Health, National Institute of Research in Tuberculosis (NIRT), International Center for Excellence in Research, Chennai, India, E-mail: sbabu@mail.nih.gov. Ralf R. Schumann, Institut für Mikrobiologie, Charité–Universitätsmedizin, Berlin, Germany, E-mail: ralf.schumann@charite.de. Aparna Srikantam, Blue Peter Public Health and Research Center, LEPRA Society, Hyderabad, India, E-mail: aparna@leprahealthinaction.in. Roswitha Merle, Department of Veterinary Medicine, Institute of Veterinary Epidemiology and Biometry, Epidemiology Group, Freie Universität Berlin, Berlin, Germany, E-mail: roswitha.merle@fu-berlin.de. Svenja Steinfelder, Department of Neural Circuits and Behavior, Max Delbrück Center for Molecular Medicine, Berlin, Germany, E-mail: svenja.steinfelder@mdc-berlin.de.

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