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. 2005 Nov 24:6:40.
doi: 10.1186/1471-2350-6-40.

Genetic, household and spatial clustering of leprosy on an island in Indonesia: a population-based study

Mirjam I Bakker  1 , Linda May, Mochammad Hatta, Agnes Kwenang, Paul R Klatser, Linda Oskam, Jeanine J Houwing-Duistermaat
Affiliations

Genetic, household and spatial clustering of leprosy on an island in Indonesia: a population-based study

Mirjam I Bakker et al. BMC Med Genet. .

Abstract

Background: It is generally accepted that genetic factors play a role in susceptibility to both leprosy per se and leprosy type, but only few studies have tempted to quantify this. Estimating the contribution of genetic factors to clustering of leprosy within families is difficult since these persons often share the same environment. The first aim of this study was to test which correlation structure (genetic, household or spatial) gives the best explanation for the distribution of leprosy patients and seropositive persons and second to quantify the role of genetic factors in the occurrence of leprosy and seropositivity.

Methods: The three correlation structures were proposed for population data (n = 560), collected on a geographically isolated island highly endemic for leprosy, to explain the distribution of leprosy per se, leprosy type and persons harbouring Mycobacterium leprae-specific antibodies. Heritability estimates and risk ratios for siblings were calculated to quantify the genetic effect. Leprosy was clinically diagnosed and specific anti-M. leprae antibodies were measured using ELISA.

Results: For leprosy per se in the total population the genetic correlation structure fitted best. In the population with relative stable household status (persons under 21 years and above 39 years) all structures were significant. For multibacillary leprosy (MB) genetic factors seemed more important than for paucibacillary leprosy. Seropositivity could be explained best by the spatial model, but the genetic model was also significant. Heritability was 57% for leprosy per se and 31% for seropositivity.

Conclusion: Genetic factors seem to play an important role in the clustering of patients with a more advanced form of leprosy, and they could explain more than half of the total phenotypic variance.

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Figures

Figure 1
Figure 1
Map of Kembanglemari Island showing the new patients per house. formula image = 0, ● = 1, formula image = 2, + = 3 new patients. Not all houses without patients are shown.
Figure 2
Figure 2
Map of Kembanglemari Island showing the seropositive persons per house. formula image = 0, ● = 1, formula image = 2, + = 3 seropositive persons. Not all houses without seropositive persons are shown.
Figure 3
Figure 3
Part of the extended pedigree of family one, showing family relations between leprosy patients.
See this image and copyright information in PMC

References

    1. World Health Organization Leprosy – Global situation. Wkly Epidemiol Rec. 2002;1:1–8.
    1. Britton WJ, Lockwood DNJ. Leprosy. Lancet. 2004;363:1209–1219. doi: 10.1016/S0140-6736(04)15952-7. - DOI - PubMed
    1. Bagshawe A, Burgh de S, Fung SC, Chuah J, Berry G. The epidemiology of leprosy in a high prevalence village in Papua New Guinea. Trans R Soc Trop Med Hyg. 1989;89:121–127. doi: 10.1016/0035-9203(89)90735-9. - DOI - PubMed
    1. Fine PE, Sterne JA, Ponnighaus JM, Bliss L, Saui J, Chihana A, Munthali M, Warndorff DK. Household and dwelling contact as risk factors for leprosy in Northern Malawi. Am J Epidemiol. 1997;146:91–102. - PubMed
    1. Van Beers SM, Hatta M, Klatser PR. Patient contact is the major determinant in incident leprosy: implication for future control. Int J Lepr Other Mycobact Dis. 1999;67:119–128. - PubMed

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