- Research article
- Open Access
Polymorphisms in the gene encoding bovine interleukin-10 receptor alpha are associated with Mycobacterium avium ssp. paratuberculosis infection status
© Verschoor et al; licensee BioMed Central Ltd. 2010
Received: 21 October 2009
Accepted: 15 April 2010
Published: 15 April 2010
Johne's disease is a chronic inflammatory bowel disease (IBD) of ruminants caused by Mycobacterium avium ssp. paratuberculosis (MAP). Since this pathogen has been implicated in the pathogenesis of human IBDs, the goal of this study was to assess whether single nucleotide polymorphism (SNPs) in several well-known candidate genes for human IBD are associated with susceptibility to MAP infection in dairy cattle.
The bovine candidate genes, interleukin-10 (IL10), IL10 receptor alpha/beta (IL10RA/B), transforming growth factor beta 1 (TGFB1), TGFB receptor class I/II (TGFBR1/2), and natural resistance-associated macrophage protein 1 (SLC11A1) were sequenced for SNP discovery using pooled DNA samples, and the identified SNPs were genotyped in a case-control association study comprised of 242 MAP negative and 204 MAP positive Holstein dairy cattle. Logistic regression was used to determine the association of SNPs and reconstructed haplotypes with MAP infection status.
A total of 13 SNPs were identified. Four SNPs in IL10RA (984G > A, 1098C > T, 1269T > C, and 1302A > G) were tightly linked, and showed a strong additive and dominance relationship with MAP infection status. Haplotypes AGC and AAT, containing the SNPs IL10RA 633C > A, 984G > A and 1185C > T, were associated with an elevated and reduced likelihood of positive diagnosis by serum ELISA, respectively.
SNPs in IL10RA are associated with MAP infection status in dairy cattle. The functional significance of these SNPs warrants further investigation.
In ruminant livestock and some wild-life species, Mycobacterium avium ssp. paratuberculosis (MAP) causes Johne's disease, a chronic inflammatory bowel disorder (IBD) that parallels human Crohn's disease in many respects. Since MAP is a slow-growing intracellular pathogen, infected cattle typically remain asymptomatic for 2 to 10 years making it difficult to control Johne's disease in dairy herds . During this asymptomatic period, the pathogen can be horizontally transmitted to other herd members via contaminated feces, and vertically transmitted to calves via contaminated milk and colostrum .
Although it is debatable, the presence of MAP in milk poses a potential zoonotic risk to humans . This may be particularly relevant for individuals that are genetically predisposed to IBD, since MAP has been implicated as one of several potential pathogens associated with Crohn's disease . A meta-analysis of studies examining the presence of MAP in patients with Crohn's disease or ulcerative colitis for example, showed that there was a greater likelihood of detecting MAP in diseased versus healthy individuals . Additionally, clinical studies have also shown that anti-mycobacterial treatment of some patients with Crohn's disease can lead to pathological remission .
Variability in the susceptibility of cattle to MAP infection is evident. In a typical commercial dairy herd where there is a consistent prevalence of MAP infection for example, it is common to find animals that appear resistant to infection, even after several years of exposure. Additionally, there is evidence that susceptibility to MAP infection, and the development of clinical symptoms associated with Johne's disease is inherited; heritability estimates in dairy cattle have been estimated to range from 0.010 to 0.183, depending on the criteria used to diagnose MAP infection or Johne's disease [6–8]. Given this, it may be possible to use selective breeding strategies to enhance resistance to MAP infection thereby reducing the incidence of Johne's disease in dairy cattle and the risk of human exposure to MAP.
Since resistance to MAP infection is likely polygenic in nature, it is essential that multiple genes be investigated for their contribution to disease resistance. Therefore, the focus of this study was to identify single nucleotide polymorphisms (SNPs) in several immune-related genes and investigate their association with MAP infection status in dairy cattle. Interleukin-10 (IL10) and its receptor (subunits IL10RA and IL10RB), transforming growth factor beta 1 (TGFB1) and two of its receptors (TGFBR1 and TGFBR2), and natural resistance-associated macrophage protein 1 (SLC11A1) were investigated in this study based on their previous associations with various types of human IBD [9–12]. Interleukin-10 and TGFB1 collectively act to control the host inflammatory response to microbial antigens; IL10 primarily operates as a feedback inhibitor of T cell responses, and TGFB1's major function is to maintain T cell tolerance to self and commensal antigens by influencing the differentiation and homeostasis of effector and regulatory T cells . Natural resistance-associated macrophage protein 1, also known as solute carrier family 11 member 1, is an iron transporter that exhibits pleiotropic effects on the early innate macrophage response to intracellular bacteria . Of the 13 SNPs identified, four in IL10RA (984G > A, 1098C > T, 1269T > C, and 1302A > G) were tightly linked, and showed a strong additive and dominance relationship with MAP infection status.
Six commercial Holstein operations in Southwestern and Eastern Ontario were selected for sample collection based on a previous history of a high prevalence of MAP infection. Blood was collected between the months of July and September 2007 via the coccygeal (tail) vein from dry and lactating cows ranging in age, breed, stage of lactation, infection status, and history of MAP screening. The protocol for collection was approved by the University of Guelph animal care committee. Current infection status was determined by identifying the presence of MAP-specific plasma antibodies using the commercially available HerdChek M. pt. Antibody ELISA Test Kit (IDEXX Laboratories, Westbrook, ME, USA) according to manufacturer's instructions. A total of 380 cows were sampled, on average 63 ± 31 from each herd. Of which, at least 4% from each herd tested positive (S/P > 0.25) or suspect (0.10 < S/P < 0.25) of MAP-infection as diagnosed by serum ELISA. Suspect animals were not included in either cohort. Infection-free animals making up the healthy (negative) control cohort (n = 242) included animals that were older than 4.5 years of age and had tested negative for MAP infection in previous years (n = 197), and those that were older than 5.5 years of age without previous screening (n = 45). The mean age of this cohort was 6.4 years (range, 4.5 to 12.7 years). The infected (positive) cohort (n = 204) was made up of animals that were considered to be infected based on the presence of MAP-specific plasma antibodies (n = 16), and a second group of animals considered to be infected based on milk MAP-specific antibodies screening carried out by Canwest DHI (Guelph, ON, CAN) (n = 188); these milk samples were generously provided between July 2006 and November 2007, and due to client anonymity, information such as age, pedigree and herd location was not available. Genomic DNA was extracted from the buffy coat of blood samples using the DNeasy blood and tissue kit (Qiagen, Santa Clara, CA, USA), and from milk according to methods previously described .
All SNPs were identified by sequencing PCR amplicons from each candidate gene using a DNA pool constructed with DNA from 40 Holstein bulls according to methods described in previous studies [16, 17]. Briefly, for each bull, genomic DNA was extracted from semen and adjusted to a concentration of 5 ng/μl after several rounds of quantification using the Quant-iT PicoGreen dsDNA reagent (Invitrogen, Carlsbad, CA, USA) followed by dilution. The resultant DNA pool was amplified using the Repli-g Ultrafast mini kit (Qiagen, Santa Clara, CA, USA), and was then used as a template for PCR amplification of the 5' region and coding exons of each candidate gene. Primers were designed using Primer3 . PCR amplicons were sequenced in both 5' and 3' orientation using an ABI Prism 3730 DNA sequencer (Applied Biosystems, Foster City CA, USA), and SNPs were identified by visual inspection of the electropherograms. Seven genes were selected for SNP discovery, IL10 [GeneId#, 281246], IL10RA  and IL10RB , TGFB 1 , TGFBR1  and TGFBR2 , and SLC11A1 . Sequences were compared against GLEAN models using the Apollo Genome Annotation and Curation Tool to confirm correct gene structure (Version 1.6.5) . In the event of a disagreement between respective GLEAN and NCBI gene models, as was the case for IL10RA, the GLEAN model was chosen.
Genotyping and haplotype reconstruction
Characteristics of SNPs discovered in IL10, IL10RA/B, TGFB1, and SLC11A1.
Primer set (5'-3')
-30A > C
-285T > C
633C > A
984G > Aa
1098C > Ta
1185C > T
1269T > Ca
1302A > Ga
503C > Tb
569A > Gb
258C > T
650C > T
1066C > G
where: η = number of cows genotyped; ρAB = frequency of haplotype AB; ρA, ρa = frequency of alleles A and a, respectively; ρB, ρb = frequency of alleles B and b, respectively.
where: y ij = MAP infection status (1 = infected, 0 = healthy) for the j- th cow; μ = overall mean; s = number of SNPs on the particular chromosome considered; a i = additive effect for the i- th SNP; w i = genotype of the i- th SNP recoded as number of alleles (0, 1 and 2); d i = dominance effect for the i- th SNP; v i = genotype of the i- th SNP recoded as homozygote or heterozygote (0 and 1); a k = additive effect for the k-th null SNP; m k = genotype of k-th null SNP recoded as number of alleles (0, 1 and 2); and e ij = random residual effect for the j-th cow. Four null SNPs were included as covariates in each logistic regression model as a means to correct for bias that may arise due to stratification between the negative and positive cohorts . These SNPs are unlinked with respect to one another and to all candidate SNPs considered, are not expected to be associated with any traits related to MAP-infection, and are polymorphic within the Canadian Holstein population (minor allele frequency (MAF) > 35%) (unpublished results).
Haplotype analysis was performed in SAS using a similar model, only is replaced by ; where: β i = linear regression coefficient (haplotype effect) for the i-th haplotype; Hap ij = the probability for the i-th haplotype for the j-th cow, where h is the number of observed haplotypes.
Experimental-wise significance levels for all tests were determined by Bonferroni correction. Regression results are presented as odds ratios (OR) and their respective 95% confidence intervals (CI).
where: λmax, λmin = the largest and smallest eigenvalue for the variables considered, respectively. Akaike's information criterion (AIC) was used to select the final regression model when multicollinearity was shown to be unacceptable.
In total, thirteen SNPs were identified: two in IL10 [-285T > C (dbSNP ssID# ss104807640) and -30A > C (ss104807641)]; six in IL10RA [633C > A (ss104807642), 984G > A (ss104807643), 1098C > T (ss104807644), 1185C > T (ss104807645), 1269T > C (ss104807646), and 1302A > G (ss104807647)]; two in IL10RB [503C > T (ss104807648), and 569A > G (ss104807649)], one in TGFB1 [258C > T (ss104807650)], and two in SLC11A1 [650C > T (ss104807654) and 1066C > G (ss104807655)]. All SNPs were submitted to NCBI dbSNP (Build 130).
Due to nearly matching genotype distributions (Pearson's r ≥ 99%) it was assumed that four SNPs in IL10RA (984G > A, 1098C > T, 1269T > C and 1302A > G), and both SNPs in IL10RB (503C > T and 569A > G) were tightly linked. Hence, all but one SNP from each of these genes was dropped from analysis in order to minimize redundancy. Pair-wise linkage disequilibrium (r2) estimates for the remaining SNPs in IL10RA were 0.07 and 0.41, between SNPs IL10RA 633C > A and 1185C > T, and 984G > A and 1185C > T, respectively, and significant at p < 0.001; similar results were previously reported in Canadian Holstein bulls . As such, it was a concern that there would be a high degree of correlation (multi-collinearity) between them in the present dataset, thereby inflating standard error of parameter estimates and thus, reducing the significance of resultant associations . Principal component analysis (PCA), followed by calculation of the condition index, suggested that these three SNPs were in a state of strong multi-collinearity (K > 140), whereas the removal of any one SNP returned the condition index to an acceptable range (7.7 < K < 10.5) . Model selection based on AIC subsequently determined that IL10RA 1185C > T was the most appropriate SNP to remove from the final multiple regression model.
Genotypic frequencies and associations of SNPs in IL10, IL10RA/B, TGFB1, and SLC11A1 with MAP-infection status.
MAP infection status
Effect ± SE
-285T > C
α: -0.29 ± 0.28
δ: 0.45 ± 0.37
633C > A
α: -0.62 ± 0.32*
δ: -0.54 ± 0.36
984G > A
α: -0.67 ± 0.22**
δ: 0.82 ± 0.25**
1185C > T
503C > T
α: 0.27 ± 0.17
δ: 0.07 ± 0.22
258C > T
α: 0.08 ± 0.16
δ: 0.04 ± 0.22
1066C > G
α: -0.27 ± 0.37
δ: 0.45 ± 0.41
Haplotype frequencies in the 3' coding region of IL10RA and their association with MAP-infection status.
MAP infection status
633C > A
984G > A
1185C > T
Negative (n = 235)
Positive (n = 180)
β ± SE
OR (95% CI)
Contrast ± SE
0.35 ± 0.15 *
-0.37 ± 0.17 *
-0.45 ± 0.18 **
-0.09 ± 0.18
-0.23 ± 0.19
-0.25 ± 0.74
-0.47 ± 0.74
In the following cohort study, two significant associations with MAP infection status were observed for the IL10RA gene. First, a strong association between the tightly linked bovine SNPs IL10RA 984G > A, 1098C > T, 1269T > C and 1302A > G and MAP infection status was detected. For these SNPs, the allele GCTA is dominant over the ATCG allele, and is associated with a higher probability of being positive for MAP. Second, when haplotype analysis was performed on SNPs IL10RA 633C > A, 984G > A and 1185C > T, equally strong, inverse associations for the haplotypes AGC and AAT with MAP infection status were observed. Considering the strong individual relationship of IL10RA 984G, 1098C, 1269T and 1302A, with MAP infection status, it is not unreasonable to assume that these SNPs are the primary contributor to these associations. Furthermore, removing 633C > A from the haplotype reconstruction resulted in haplotype frequencies and associations that were negligibly different from those reported above (unpublished results). Contrasts indicated a strong, significant effect in reducing the proportion of infected animals when replacing the most frequent haplotype, AGC, with AAT. This would suggest that it may be possible to lower the overall frequency of MAP infection as diagnosed by serum ELISA by increasing the frequency of the AAT haplotype through selective breeding. However, since the impact of such a breeding decision on the prevalence of other diseases is currently unknown, such a strategy should be approached with caution.
Interleukin-10 has emerged as an essential immunoregulatory cytokine during bacterial infections. In the context of Mycobacterium spp. for example, IL10 helps to control excessive T helper 1 and CD8+ T cell responses that contribute to the immunopathology associated with infection; it also prevents the overproduction of IL4, IL5, and IL13, which can lead to severe fibrosis during the T helper 2 response . This may be particularly relevant at mucosal surfaces, since human studies have implicated functional SNPs in the IL10 gene as risk factors for IBD  and tuberculosis . In cattle, IL10 is up-regulated during subclinical and clinical MAP infections [29, 30], and its neutralization has been shown to promote the activation of MAP-infected bovine macrophages and subsequent killing of the organism . Similar findings have also been demonstrated with human infection studies performed in vitro using Mycobacterium tuberculosis[32, 33].
Although the present study found no association between variants in the bovine IL10 gene and MAP infection, it did provide evidence that variants in the IL10RA gene, which encodes the ligand-binding subunit of the IL10R and is a major determinant of IL10 responsiveness [34, 35], may contribute to susceptibility to MAP infection. We are unaware of previous studies indicating that variants in the IL10R gene influence the susceptibility to mycobacterium infection. However, previous work has shown that antibody-mediated neutralization of the IL10R complex reduces the susceptibility of mice to Mycobacterium avium and increase the efficacy of anti-mycobacterial therapy . In support of this, associations have been reported between SNPs in the human IL10RA and IL10RB genes and the level of IL10 expression in mucosal tissues . Our group has also recently identified associations in Holstein dairy bulls between the presently studied IL10RA haplotype and estimated breeding values for somatic cell score, a trait highly correlated to the incidence of the inflammatory disease mastitis . Furthermore, based on alignment with the murine homologue, all of the SNPs identified within IL10RA, with exception to 633C > A, appear to code for a region of the cytoplasmic domain that defines cellular responsiveness to IL10 and mediates cellular proliferation . It is important to note, however, that before any definite conclusions can be made concerning the magnitude of IL10RA's contribution to susceptibility/resistance to MAP infection, it will be necessary to functionally characterize the IL10RA haplotype, since the SNPs it represents are all synonymous mutations that may be linked to a nearby gene on BTA15 that confers susceptibility/resistance to MAP infection. Traditionally, synonymous SNPs are viewed as "silent" and thus may not warrant functional validation, however, several studies addressing the role of codon usage bias, as well as mRNA folding, have reported otherwise [39–41].
Two limitations related to the design of the present study warrant that the reported associations be approached with caution. First, the cows in the negative cohort were categorized as such using the serum ELISA, and in some cases, the milk ELISA as well. These tests, while known to be very specific, have relatively low sensitivities; 25-94% and 29-61%, for the serum and milk ELISA, respectively . Therefore, it is likely a proportion of negative animals are in fact MAP infected, but have yet to produce a strong enough antibody-response required for positive diagnosis. A major implication is that such bias could skew allelic frequencies for certain SNPs, leading to an under- or over-estimation of the true effect. In the present study, the control cohort consisted of cows older than 4.5 years of age (mean = 6.4 years) that had been diagnosed negative by serum ELISA, the majority of which with previous screening by milk ELISA. Given that it is generally accepted that cattle become MAP-infected as calves , we believe that a cohort consisting of older cows will likely contain a sufficiently low number of false negatives, thereby minimizing any related bias. This is supported by a number of studies reporting a positive correlation between seroprevalence and age [44–46].
The second limitation of the present study was the absence of information about the family structure of a substantial number of the genotyped cows; this prevented us from classifying population stratification and substructure, which can bias genetic association studies . To address this issue, we included null markers as covariates in the logistic regression SNP association analysis. This approach has be shown to be very effective for controlling bias due to stratification in candidate gene association studies , and whole genome association approaches . While these SNPs are suitable for inclusion as null markers since they are unlinked to one another and to the candidate SNPs considered, and are polymorphic within the Canadian Holstein population (MAF > 35%), they have not been validated for their ability to identify stratification within said population. Thus, it is essential that the results presented in this study are validated in a larger and more diverse cohort study in order to ensure that the associations drawn from the present study are not skewed by biasing effects such as family structure.
In summary, several SNPs were identified in the bovine genes encoding IL10, IL10RA, IL10RB, TGFB1, and SLC11A1. A strong association between a group of tightly linked synonymous SNPs in the 3' coding region of IL10RA, 984G > A, 1098C > T, 1269T > C and 1302A > G, and MAP infection status Canadian dairy cattle was established. Haplotype reconstruction of the SNPs in IL10RA also revealed a strong association with MAP infection status. These results provide initial evidence that variants in IL10RA may contribute to susceptibility to MAP infection in dairy cattle.
This work was generously funded by the Natural Sciences and Engineering Research Council of Canada (NSERC) and The Dairy Cattle Genetics Research and Development (DairyGen) Council. Many thanks to Richard Cantin, Canwest DHI, for providing milk samples, Jeremy Mount and Graham Biggar for sample collection, and the operators of the commercial dairy herds who allowed sampling of their animals.
- McKenna SL, Keefe GP, Tiwari A, VanLeeuwen J, Barkema HW: Johne's disease in Canada part II: disease impacts, risk factors, and control programs for dairy producers. Can Vet J. 2006, 47: 1089-1099.PubMed CentralPubMedGoogle Scholar
- Waddell LA, Rajic A, Sargeant J, Harris J, Amezcua R, Downey L, et al: The zoonotic potential of Mycobacterium avium spp. paratuberculosis: a systematic review. Can J Public Health. 2008, 99: 145-155.PubMedGoogle Scholar
- Glasser AL, Darfeuille-Michaud A: Abnormalities in the handling of intracellular bacteria in Crohn's disease: a link between infectious etiology and host genetic susceptibility. Arch Immunol Ther Exp (Warsz). 2008, 56: 237-244. 10.1007/s00005-008-0026-1.View ArticleGoogle Scholar
- Feller M, Huwiler K, Stephan R, Altpeter E, Shang A, Furrer H, et al: Mycobacterium avium subspecies paratuberculosis and Crohn's disease: a systematic review and meta-analysis. Lancet Infect Dis. 2007, 7: 607-613. 10.1016/S1473-3099(07)70211-6.View ArticlePubMedGoogle Scholar
- Chamberlin W, Ghobrial G, Chehtane M, Naser SA: Successful treatment of a Crohn's disease patient infected with bacteremic Mycobacterium paratuberculosis. Am J Gastroenterol. 2007, 102: 689-691. 10.1111/j.1572-0241.2007.01040_7.x.View ArticlePubMedGoogle Scholar
- Koets AP, Adugna G, Janss LL, van Weering HJ, Kalis CH, Wentink GH, et al: Genetic variation of susceptibility to Mycobacterium avium subsp. paratuberculosis infection in dairy cattle. J Dairy Sci. 2000, 83: 2702-2708. 10.3168/jds.S0022-0302(00)75164-2.View ArticlePubMedGoogle Scholar
- Gonda MG, Chang YM, Shook GE, Collins MT, Kirkpatrick BW: Genetic variation of Mycobacterium avium ssp. paratuberculosis infection in US Holsteins. J Dairy Sci. 2006, 89: 1804-1812. 10.3168/jds.S0022-0302(06)72249-4.View ArticlePubMedGoogle Scholar
- Mortensen H, Nielsen SS, Berg P: Genetic variation and heritability of the antibody response to Mycobacterium avium subspecies paratuberculosis in Danish Holstein cows. J Dairy Sci. 2004, 87: 2108-2113. 10.3168/jds.S0022-0302(04)70029-6.View ArticlePubMedGoogle Scholar
- Tamizifar B, Lankarani KB, Naeimi S, Rismankar ZM, Taghavi A, Ghaderi A: Promoter polymorphism of transforming growth factor-beta1 gene and ulcerative colitis. World J Gastroenterol. 2008, 14: 243-247. 10.3748/wjg.14.243.PubMed CentralView ArticlePubMedGoogle Scholar
- Tedde A, Laura PA, Bagnoli S, Congregati C, Milla M, Sorbi S, et al: Interleukin-10 promoter polymorphisms influence susceptibility to ulcerative colitis in a gender-specific manner. Scand J Gastroenterol. 2008, 43: 712-718. 10.1080/00365520701885507.View ArticlePubMedGoogle Scholar
- Sechi LA, Rosu V, Pacifico A, Fadda G, Ahmed N, Zanetti S: Humoral immune responses of type 1 diabetes patients to Mycobacterium avium subsp. paratuberculosis lend support to the infectious trigger hypothesis. Clin Vaccine Immunol. 2008, 15: 320-326. 10.1128/CVI.00381-07.PubMed CentralView ArticlePubMedGoogle Scholar
- Zaahl MG, Winter TA, Warnich L, Kotze MJ: The -237C-->T promoter polymorphism of the SLC11A1 gene is associated with a protective effect in relation to inflammatory bowel disease in the South African population. Int J Colorectal Dis. 2006, 21: 402-408. 10.1007/s00384-005-0019-z.View ArticlePubMedGoogle Scholar
- Li MO, Flavell RA: Contextual regulation of inflammation: a duet by transforming growth factor-beta and interleukin-10. Immunity. 2008, 28: 468-476. 10.1016/j.immuni.2008.03.003.View ArticlePubMedGoogle Scholar
- McDermid JM, Prentice AM: Iron and infection: effects of host iron status and the iron-regulatory genes haptoglobin and NRAMP1 (SLC11A1) on host-pathogen interactions in tuberculosis and HIV. Clin Sci (Lond). 2006, 110: 503-524. 10.1042/CS20050273.View ArticleGoogle Scholar
- Murphy MA, Shariflou MR, Moran C: High quality genomic DNA extraction from large milk samples. J Dairy Res. 2002, 69: 645-649. 10.1017/S0022029902005848.View ArticlePubMedGoogle Scholar
- Pant SD, Schenkel FS, Leyva-Baca I, Sharma BS, Karrow NA: Identification of single nucleotide polymorphisms in bovine CARD15 and their associations with health and production traits in Canadian Holsteins. BMC Genomics. 2007, 8: 421-10.1186/1471-2164-8-421.PubMed CentralView ArticlePubMedGoogle Scholar
- Sharma BS, Leyva I, Schenkel F, Karrow NA: Association of toll-like receptor 4 polymorphisms with somatic cell score and lactation persistency in Holstein bulls. J Dairy Sci. 2006, 89: 3626-3635. 10.3168/jds.S0022-0302(06)72402-X.View ArticlePubMedGoogle Scholar
- Rozen S, Skaletsky H: Primer3 on the WWW for general users and for biologist programmers. Methods Mol Biol. 2000, 132: 365-386.PubMedGoogle Scholar
- Lewis SE, Searle SM, Harris N, Gibson M, Lyer V, Richter J, et al: Apollo: a sequence annotation editor. Genome Biol. 2002, 3: RESEARCH0082-10.1186/gb-2002-3-12-research0082.PubMed CentralView ArticlePubMedGoogle Scholar
- Stephens M, Donnelly P: A comparison of bayesian methods for haplotype reconstruction from population genotype data. Am J Hum Genet. 2003, 73: 1162-1169. 10.1086/379378.PubMed CentralView ArticlePubMedGoogle Scholar
- Krawetz SA, Womble DD: Introduction to Bioinformatics: A Theoretical and Practical Approach. 2003, Totowa, NJ, Humana PressView ArticleGoogle Scholar
- Wang Y, Localio R, Rebbeck TR: Bias correction with a single null marker for population stratification in candidate gene association studies. Hum Hered. 2005, 59: 165-175. 10.1159/000085940.View ArticlePubMedGoogle Scholar
- Belsley DA: Conditioning Diagnostics: Collinearity and Weak Data in Regression. 1991, NY, USA: Wiley-Interscience, 1Google Scholar
- Verschoor CP, Pant SD, Schenkel FS, Sharma BS, Karrow NA: SNPs in the bovine IL10 receptor are associated with somatic cell score in Canadian dairy bulls. Mamm Genome. 2009, 20: 447-454. 10.1007/s00335-009-9198-1.View ArticlePubMedGoogle Scholar
- Slinker BK, Glantz SA: Multiple regression for physiological data analysis: the problem of multicollinearity. Am J Physiol. 1985, 249:Google Scholar
- Meloun M, Militky J, Hill M, Brereton RG: Crucial problems in regression modelling and their solutions. Analyst. 2002, 127: 433-450. 10.1039/b110779h.View ArticlePubMedGoogle Scholar
- Couper KN, Blount DG, Riley EM: IL10: the master regulator of immunity to infection. J Immunol. 2008, 180: 5771-5777.View ArticlePubMedGoogle Scholar
- Ates O, Musellim B, Ongen G, Topal-Sarikaya A: Interleukin-10 and tumor necrosis factor-alpha gene polymorphisms in tuberculosis. J Clin Immunol. 2008, 28: 232-236. 10.1007/s10875-007-9155-2.View ArticlePubMedGoogle Scholar
- Karcher EL, Beitz DC, Stabel JR: Modulation of cytokine gene expression and secretion during the periparturient period in dairy cows naturally infected with Mycobacterium avium subsp. paratuberculosis. Vet Immunol Immunopathol. 2008, 123: 277-288. 10.1016/j.vetimm.2008.02.006.View ArticlePubMedGoogle Scholar
- Khalifeh MS, Stabel JR: Upregulation of transforming growth factor-beta and interleukin-10 in cows with clinical Johne's disease. Vet Immunol Immunopathol. 2004, 99: 39-46. 10.1016/j.vetimm.2004.01.009.View ArticlePubMedGoogle Scholar
- Weiss DJ, Evanson OA, de SC, Abrahamsen MS: A critical role of interleukin-10 in the response of bovine macrophages to infection by Mycobacterium avium subsp paratuberculosis. Am J Vet Res. 2005, 66: 721-726. 10.2460/ajvr.2005.66.721.View ArticlePubMedGoogle Scholar
- Fietta A, Meloni F, Francioli C, Morosini M, Bulgheroni A, Casali L, et al: Virulence of Mycobacterium tuberculosis affects interleukin-8, monocyte chemoattractant protein-1 and interleukin-10 production by human mononuclear phagocytes. Int J Tissue React. 2001, 23: 113-125.PubMedGoogle Scholar
- Al-Attiyah R, Mustafa AS: Characterization of human cellular immune responses to novel Mycobacterium tuberculosis antigens encoded by genomic regions absent in Mycobacterium bovis BCG. Infect Immun. 2008, 76: 4190-4198. 10.1128/IAI.00199-08.PubMed CentralView ArticlePubMedGoogle Scholar
- Ding Y, Qin L, Zamarin D, Kotenko SV, Pestka S, Moore KW, et al: Differential IL10R1 expression plays a critical role in IL10-mediated immune regulation. J Immunol. 2001, 167: 6884-6892.View ArticlePubMedGoogle Scholar
- Tamassia N, Calzetti F, Menestrina N, Rossato M, Bazzoni F, Gottin L, et al: Circulating neutrophils of septic patients constitutively express IL10R1 and are promptly responsive to IL10. Int Immunol. 2008, 20: 535-541. 10.1093/intimm/dxn015.View ArticlePubMedGoogle Scholar
- Roque S, Nobrega C, Appelberg R, Correia-Neves M: IL10 underlies distinct susceptibility of BALB/c and C57BL/6 mice to Mycobacterium avium infection and influences efficacy of antibiotic therapy. J Immunol. 2007, 178: 8028-8035.View ArticlePubMedGoogle Scholar
- Simhan HN, Ryckman KK, Williams SM, Krohn MA: Genetic regulation of cervical antiinflammatory cytokine concentrations during pregnancy. Am J Obstet Gynecol. 2008, 199: 163-PubMedGoogle Scholar
- Ho AS, Wei SH, Mui AL, Miyajima A, Moore KW: Functional regions of the mouse interleukin-10 receptor cytoplasmic domain. Mol Cell Biol. 1995, 15: 5043-5053.PubMed CentralView ArticlePubMedGoogle Scholar
- Duan J, Wainwright MS, Comeron JM, Saitou N, Sanders AR, Gelernter J, et al: Synonymous mutations in the human dopamine receptor D2 (DRD2) affect mRNA stability and synthesis of the receptor. Hum Mol Genet. 2003, 12: 205-216. 10.1093/hmg/ddg055.View ArticlePubMedGoogle Scholar
- Chamary JV, Hurst LD: Evidence for selection on synonymous mutations affecting stability of mRNA secondary structure in mammals. Genome Biol. 2005, 6: R75-10.1186/gb-2005-6-9-r75.PubMed CentralView ArticlePubMedGoogle Scholar
- Salomons GS, Bok LA, Struys EA, Pope LL, Darmin PS, Mills PB, et al: An intriguing "silent" mutation and a founder effect in antiquitin (ALDH7A1). Ann Neurol. 2007, 62: 414-418. 10.1002/ana.21206.View ArticlePubMedGoogle Scholar
- Nielsen SS, Toft N: Ante mortem diagnosis of paratuberculosis: a review of accuracies of ELISA, interferon-gamma assay and faecal culture techniques. Vet Microbiol. 2008, 129: 217-235. 10.1016/j.vetmic.2007.12.011.View ArticlePubMedGoogle Scholar
- Windsor PA, Whittington RJ: Evidence for age susceptibility of cattle to Johne's disease. Vet J. 2009, 184 (1): 37-44. 10.1016/j.tvjl.2009.01.007.View ArticlePubMedGoogle Scholar
- Geisbauer E, Khol JL, Wassertheurer M, Damoser J, Osterreicher E, Dunser M, et al: Longterm investigation in an Austrian dairy herd with low prevalence of paratuberculosis detection of antibodies in blood and milk. Vet Q. 2007, 29: 138-148.View ArticlePubMedGoogle Scholar
- Nielsen SS, Toft N: Age-specific characteristics of ELISA and fecal culture for purpose-specific testing for paratuberculosis. J Dairy Sci. 2006, 89: 569-579. 10.3168/jds.S0022-0302(06)72120-8.View ArticlePubMedGoogle Scholar
- Woodbine KA, Schukken YH, Green LE, Ramirez-Villaescusa A, Mason S, Moore SJ, et al: Seroprevalence and epidemiological characteristics of Mycobacterium avium subsp. paratuberculosis on 114 cattle farms in south west England. Prev Vet Med. 2009, 89: 102-109. 10.1016/j.prevetmed.2009.02.005.View ArticlePubMedGoogle Scholar
- Rodriguez-Murillo L, Greenberg DA: Genetic association analysis: a primer on how it works, its strengths and its weaknesses. Int J Androl. 2008, 31: 546-556. 10.1111/j.1365-2605.2008.00896.x.View ArticlePubMedGoogle Scholar
- Setakis E, Stirnadel H, Balding DJ: Logistic regression protects against population structure in genetic association studies. Genome Res. 2006, 16: 290-296. 10.1101/gr.4346306.PubMed CentralView ArticlePubMedGoogle Scholar
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