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Genetic variations in genes involved in heparan sulphate biosynthesis are associated with Plasmodium falciparum parasitaemia: a familial study in Burkina Faso

Malaria Journal volume 11, Article number: 108 (2012) Cite this article

Abstract

Background

There is accumulating evidence that host heparan sulphate proteoglycans play an important role in the life cycle of Plasmodium through their heparan sulphate chains, suggesting that genetic variations in genes involved in heparan sulphate biosynthesis may influence parasitaemia. Interestingly, Hs3st3a1 and Hs3st3b1 encoding enzymes involved in the biosynthesis of heparan sulphate are located within a chromosomal region linked to Plasmodium chabaudi parasitaemia in mice. This suggests that HS3ST3A1 and HS3ST3B1 may influence P. falciparum parasitaemia in humans.

Methods

Polymorphisms within HS3ST3A1 and HS3ST3B1 were identified in 270 individuals belonging to 44 pedigrees and living in Burkina Faso. Linkage and association between parasitaemia and the polymorphisms were assessed with MERLIN and FBAT. A genetic interaction analysis was also conducted based on the PGMDR approach.

Results

Linkage between P. falciparum parasitaemia and the chromosomal region containing HS3ST3A1 and HS3ST3B1 was detected on the basis of the 20 SNPs identified. In addition, rs28470223 located within the promoter of HS3ST3A1 was associated with P. falciparum parasitaemia, whereas the PGMDR analysis revealed a genetic interaction between HS3ST3A1 and HS3ST3B1. Seventy-three significant multi-locus models were identified after correcting for multiple tests; 37 significant multi-locus models included rs28470223, whereas 38 multi-locus models contained at least one mis-sense mutation within HS3ST3B1.

Conclusion

Genetic variants of HS3ST3A1 and HS3ST3B1 are associated with P. falciparum parasitaemia. This suggests that those variants alter both the function of heparan sulphate proteoglycans and P. falciparum parasitaemia.

Background

Plasmodium falciparum malaria is transmitted to humans through the bite of infected female Anopheles mosquitoes. Sporozoites that have been injected into the skin migrate from the site of injection, and reach the liver, where they invade hepatocytes and change into merozoites; merozoites penetrate and replicate inside red blood cells. Heparan sulphate proteoglycans (HSPGs) may play an important role in the biology of Plasmodium through their carbohydrate chains (heparan sulphate) in both the mammalian host and the vector. Anopheles heparan sulphate has been shown to bind circumsporozoite protein (CSP), suggesting a role for the carbohydrate chains within Anopheles salivary glands for infection and transmission of the parasite [1]. CSP also interacts with the HSPGs on host liver cells, and this interaction has been shown to determine the choice between migrating through or invading the cell [2]. Highly sulphated HSPGs of hepatocytes activates the rodent malaria parasite Plasmodium berghei for invasion, whereas the parasite migrates through cells with low sulphated HSPGs in skin and endothelium [2]. In addition, a P. falciparum merozoite antigen (EBA-140) has been shown to bind to red blood cells in a heparan sulphate-manner, whereas soluble heparan sulphate and heparin inhibit the merozoite invasion into red blood cells [3, 4]. Finally, heparan sulphate is thought to be a receptor for PfEMP1 expressed on infected red blood cells (iRBC), and to mediate the binding of iRBC on endothelial cells or other red blood cells [4–6].

These observations suggest that the outcome of malaria infection may be influenced by variations in the biosynthesis of heparan sulphate, owing to genetic variations within genes encoding the enzymes involved. These include O-sulphotransferases, which catalyze 2-O, 6-O, or 3-O sulphation [7]. The O-sulphation steps are the last steps of the synthesis of heparan sulphate (HS); the sulphation level is a measure of the completion of this synthesis, and is thought to influence the binding properties and therefore the function of HSPGs [7]. The 3-O-sulphation is thought to be a rare event, whereas the 3-O sulphated HS has been shown to serve as an entry receptor of Herpes Simplex Virus 1 (HSV-1) [8]. Interestingly, whereas only one 2-O sulphotransferase, and one 6-O sulphotransferase are known, seven isoforms of 3-O sulphotransferases have been reported [7, 9]. The genes encoding the 3-O sulphotransferases are located in different chromosomal regions except for HS3ST3A1 and HS3ST3B1, and the only significant sequence homology between these proteins occurs in the sulphotransferase domains. Nevertheless, HS3ST3A1 and HS3ST3B1, which encode the 3-O sulphotransferases 3-OST-3A1 and 3-OST-3B1 respectively, are 700 kb apart in the same chromosomal region, and show a high sequence identity [10]. 3-OST-3B1, which has a sulphotransferase domain 99.2% identical to that of 3-OST-3A1, sulphates an identical disaccharide [11]. Recently, HS3ST3A1 that encodes 3-OST-3A1 has been associated with mother-to-child transmission of human immunodeficiency virus (HIV) through a genome-wide association study [12], whereas HSPGs promotes HIV penetration through endothelial cells in a heparan sulphate-manner [13]. This supports the hypothesis that genetic variations within the genes encoding 3-O-sulphotransferases may affect the susceptibility to infectious diseases, such as malaria.

There is a growing body of evidence for human genetic factors controlling the outcome of infection. Familial aggregation and segregation analyses showed the existence of a genetic component of phenotypes related to P. falciparum malaria resistance or susceptibility [14, 15]. Several candidate genes have been associated with resistance against severe malaria [16]. Linkage or association analyses mapped various loci controlling mild malaria and/or parasitaemia in humans [15, 17–19]. The first chromosomal regions that showed linkage to mild malaria and/or parasitaemia were 6p21.3 and 5q31-q33 [15, 17, 20, 21]. However, a limited number of confirmed alleles involved in human malaria have been identified [22, 23]. In crosses between genetically defined strains of mice, chromosomal regions responsible for the genetic variance of complex traits can be mapped as quantitative trait loci (QTL) in experimental populations available for precise study under defined conditions. Linkage analyses based on experimental crosses have been done in mice, leading to the mapping of loci controlling Plasmodium chabaudi parasitaemia (Char1-10) or cerebral malaria [22, 24, 25]. Notably, such analyses mapped two loci on chromosomes 17 (Char3) and 11 (Char8), which show extensive conservation of synteny with human chromosomes 6p21.3 and 5q31-q33, respectively [26, 27]. The 95% confidence interval of Char8 (chromosome 11 between D11Mit231 and D11Mit30) contained mostly genes, the orthologs of which are located in human chromosome 5q31-q33. Nevertheless, it also contained genes, the orthologs of which are located in human chromosome 17; these include Hs3st3a1 and Hs3st3b1, which encode 3-O sulphotransferases in mice [26, 27], suggesting that genetic variations within HS3ST3A1 and HS3ST3B1 may influence parasitaemia in humans. This hypothesis was further supported by a linkage study based on microsatellite markers in humans (P.Rihet, unpublished data). This prompted us to screen HS3ST3A1 and HS3ST3B1 in a population living in an endemic area in Burkina Faso to identify polymorphisms, to evaluate their linkage and association with parasitaemia, and gene-gene interactive effects by using the pedigree-based generalized multifactor dimensionality reduction (PGMDR) method [28].

Methods

Subjects

The study subjects live in a rural area, Logoforousso, a village to the south-west of Bobo-Dioulasso (Burkina Faso). The population and the area of parasite exposure have been extensively described [29]. Volunteer families were randomly selected from 3,500 inhabitants. Informed consent was then obtained individually from all participants or their parents. The protocol was approved by the national medical authorities of Burkina Faso. Four mosquito capture sites were chosen, and mosquitoes were collected outdoors 4 days each month (during two nights every 2 weeks). The inoculation rate was 230 infective bites per person per year. The study population comprised 270 subjects from 44 pedigrees corresponding to 71 nuclear families. Eighty-seven parents and 183 siblings were available for genotyping and retained for linkage analysis. The mean age of the siblings was 9.9 ± 4.4 (three to 25 years).

Phenotyping

Parasitaemia was measured as described [29]. During two years, each family in the rural area was visited 28 times. Blood samples were taken from all individuals present, and only asymptomatic P. falciparum parasitaemia measurements were considered in this study. The mean number of asymptomatic P. falciparum parasitaemia measurements per subject was 14.9 + 8.1 (range one to 28). The parasitaemia was defined as the number of parasitized erythrocytes observed per microlitre in thin blood films. The analysis was conducted on a logarithmic transformation of parasitaemia adjusted for seasonal transmission and for age that showed a significant effect on parasitaemia (P < 10-4). The standardized residual was the phenotype used for linkage and association analyses.

Genotyping

Each subject underwent a venipuncture, and DNA was extracted from mononuclear cells separated by Ficoll-Hypaque density gradient as described [15]. DNA concentration was assessed with a biophotometer (Eppendorf, Le Pecq, France). The DNA samples (n = 270) were subjected to prior whole-genome amplification with the Illustra GenomiPhi V2 DNA Amplification Kit from General Electric Healthcare (GE Healthcare Biosciences, Pittsburgh, PA, USA) before genotyping. To identify mutations in the promoter region, in all the coding regions and the intron-exon border, defined PCR products were sequenced. All primer pairs were designed with the PRIMER 3 program [30]. There is a strong homology between HS3ST3A1 coding sequence and that of HS3ST3B1, particularly between exon 2 sequences [10]. Therefore, a first set of primers corresponding to non-coding regions that display sequence variation were designed. PCR was performed with a first set of primers leading to a large product, whereas sequencing reaction was performed with additional internal primers (Additional file 1). Before starting the sequencing reaction, the PCR products were purified with the Qiagen QIAquick PCR purification kit (Qiagen, Hilden, Germany) and quantified by 2% agarose gel electrophoresis. Sequencing reaction was performed with the CEQ DTCS kit (Beckman Coulter, Fullerton, CA, USA) and a CEQ 8800 automated fluorescent sequencer (Beckman Coulter).

Allele frequencies, haplotype reconstruction and linkage disequilibrium analysis

The compatibility with Mendelian inheritance of marker alleles was checked with the FBAT and MERLIN programs [31, 32]. All genotypes passed a Mendelian check with the program FBAT. Using MERLIN, improbable recombination events from SNP maps were checked to detect genotyping errors.

Allele frequencies were calculated by gene counting and deviation from Hardy-Weinberg equilibrium was tested using a Chi-2-test with 1 degree of freedom. Haplotypes were generated based on family genotypic data with MERLIN. Pair-wise LD (Linkage Disequilibrium) was calculated with Haploview and graphical overview of linkage disequilibrium (GOLD) [33, 34]. LD between pairs of biallelic markers was tested by the r2 statistic, r2 = (p11p22-p12p21)2/p1p2q1q2, where p11, p22, p12, and p21 were two-locus haplotype frequencies, and p1, p2, q1, and q2 were allele frequencies. r2 is the standard c2 statistic divided by the number of chromosomes in the sample. It ranges from 0 to 1. When r2 is 1, SNPs are in complete LD.

Statistical analyses

Multipoint linkage analyses were performed for sibship and half-sibship data using the software package the MERLIN Package [31]. The regression-based procedure was used for quantitative trait linkage analysis [35]. Combined association and linkage analyses of quantitative traits were carried out using the FBAT program and the QTDT program [32, 36]. FBAT calculates a Z score and a two-side P value based on a normal approximation. Association in the presence of linkage was assessed using the orthogonal model released in the QTDT program [36]. P values were calculated using the likelihood-ratio criterion.

Genetic interactions were analysed by using the pedigree-based generalized multifactor dimensionality reduction method (PGMDR) [28]. The PGMDR is a score-based MDR method that uses the same data reduction strategy as does the original MDR method to detect non-linear genetic interactions [37]. Briefly, the informative siblings were randomly divided into nearly 10 nearly equal subsets, and the cross-validation was repeated 10 times. Each time, nine subsets were used as the training set to construct a binary model with high risk and low risk genotype combinations, while the last subset was considered the testing set. The odds ratio, the corresponding 95% confidence interval, and the P value were calculated for the training set. The testing set was used to estimate the prediction accuracy of the model, which is the ratio of correct classifications to the total number of instances classified. The non-parametric sign test was used to evaluate the significance of the prediction accuracy.

The false discovery rate (FDR) procedure was performed to account for the multiple tests performed [38]; an FDR of 5% and an FDR of 10% were applied. Multiple test corrections were carried out for all the linkage, association, and interaction analyses.

Results

Descriptive analyses

Twenty polymorphisms were identified in the promoter, the exons, the intron-exon junctions, and the 3' untranslated region of HS3ST3A1 and HS3ST3B1 (Table 1). Notably, some SNPs annotated both in HS3ST3A1 and HS3ST3B1 were found in either HS3ST3A1 or HS3ST3B1 (Figure 1). All SNPs passed a Mendelian check, and the detectable genotype errors were < 0.1% based on improbable recombination events from dense SNP maps. There was no deviation from the Hardy-Weinberg equilibrium. Figure 2 shows pair-wise linkage disequilibrium coefficients. There was a significant linkage disequilibrium between some SNPs within either HS3ST3A1 or HS3ST3B1, whereas no linkage disequilibrium was detected between HS3ST3A1 and HS3ST3B1. In particular, there was a highly significant linkage disequilibrium between rs3744337 and rs3744335 (r2 = 0.72; P < 0.0001) within HS3ST3A1; there was also a highly significant linkage disequilibrium between rs2072243 and rs2072242 (r2 = 0.64; P < 0.0001) within HS3ST3B1.

Table 1 Overview of the polymorphisms genotyped in the African population
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Figure 1
figure 1

(A) Diagram of the HS3ST3A1/HS3ST3B1 locus. (B) Location of the known SNPs in relation to the intron/exon structure of HS3ST3A1 and HS3ST3B1. The SNPs that were detected are in bold. The 5'- and 3'-UTRs are shown by white boxes and the coding exons are shown by hatched boxes. The regions that encode the sulphotransferase domain are shown.

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Figure 2
figure 2

Pair-wise linkage disequilibrium map within HS3ST3A1 and HS3ST3B1. Dark denotes highly significant linkage disequilibrium. R2 multiplied by 100 value is shown.

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Linkage and association analyses

A regression-based procedure was applied for multipoint linkage analysis using MERLIN. Based on the analysis of the 20 SNPs, parasitaemia was genetically linked to the region containing HS3ST3A1 and HS3ST3B1 after applying an FDR of 10% (Table 2), with a peak of linkage at rs61729712 (LOD score = 1.207, P = 0.009). A linkage was also detected based on the analysis of the 10 SNPs with the highest Minor Allele Frequency (MAF) after applying a FDR of 5% (Table 3); the peak of linkage was, nevertheless, at rs115229628 (LOD score = 1.409, P = 0.005).

Table 2 Multi-point linkage analyses of parasitaemia to HS3ST3A1 and HS3ST3B1 based on the 20 SNPs
Full size table
Table 3 Multi-point linkage analyses of parasitaemia to HS3ST3A1 and HS3ST3B1 based on the 10 SNPs having the highest MAF
Full size table

Combined linkage and association between each SNP and parasitaemia was further evaluated. FBAT showed evidence of linkage and association between rs28470223 and parasitaemia (P = 0.005), whereas the other SNPs were not associated with parasitaemia (P > 0.09). The allele C was negatively associated with parasitaemia (Z = -2.77; P = 0.005), whereas the allele T was positively associated with parasitaemia (Z = 2.77; P = 0.005). This result remained significant after applying an FDR of 5%, and confirmed the linkage signal detected with MERLIN. Furthermore, the linkage was taken into account to test the association between each SNP and parasitaemia by using QTDT; an association in the presence of linkage was detected for rs28470223 (P < 0.003) after applying an FDR of 5%.

Interaction analysis

The epistatic effect of HS3ST3A1 and HS3ST3B1 SNPs was investigated, based on the knowledge of the biological activity of HS3ST3A1 and HS3ST3B1. Two-, three-, four-, and five-locus models were evaluated. Additional file 2 shows the best models identified on the basis of the classification parameters with the training set (Odds Ratio and P v alue) and the cross-validation analysis with the testing set (prediction accuracy and sign test P value) after applying a FDR of 5%. The analysis revealed 73 significant multi-locus models, which could be consistently cross-validated (Additional file 2). In other words, the analysis of the training set yielded 73 binary models with high and low risk genotype combinations, which were significantly associated with parasitaemia, and which were validated based on the testing set. All the significant multi-locus models included SNPs located in both HS3ST3A1 and HS3ST3B1. The significant models included 19 of the 20 SNPs. These include: i) rs3744337, rs3744335, rs28470223, rs78863672, rs2072243, rs2072242, and rs115229628 that are located within the 5'UTR region of either HS3ST3A1 or HS3ST3B1: ii) rs3785655 and rs7379332 that are within the 3'UTR region of HS3ST3B1; iii) rs9906855, rs62057033, rs61732181, rs61744056, rs62636622 and rs55688668 that are synonymous mutations of either HS3ST3A1 or HS3ST3B1; and iv) rs62636623, rs62056073, rs61729712, and rs9906590 that are mis-sense mutations within HS3ST3B1. Interestingly, rs28470223 was in 37 of the 73 significant multi-locus models, and 38 multi-locus models contained at least one mis-sense mutation.

Discussion

This is apparently the first study to investigate the association between a phenotype related to malaria susceptibility and genes involved in HS biosynthesis. Two genes 700 kb apart, which encode 3-O sulphotransferases involved in the synthesis of HS (HS3ST3A1 and HS3ST3B1), were considered as candidate genes.

First, P. falciparum parasitaemia was found to be genetically linked to HS3ST3A1 and HS3ST3B1 polymorphisms based on a multipoint linkage analysis. This result is consistent with linkage studies based on microsatellite markers in mice [26, 27] and humans (P. Rihet, unpublished data). This suggests that polymorphisms within the chromosomal region may partly explain the variance of parasitaemia, and may affect resistance against malaria. In the same way, rs6503319, which is located in the human chromosomal region genetically linked to parasitaemia (P.Rihet, unpublished data), has been associated with severe malaria [39]. It should be stressed, however, that the location of the peak of linkage depends on the SNPs included in the analysis. This indicates either that the linkage analysis does not accurately locate the causal polymorphisms, or that several polymorphisms within the region may influence parasitaemia.

Second, linkage and association between parasitaemia and rs28470223 was detected. Thus, this one-locus analysis confirmed the linkage signal obtained with the multipoint analysis. Furthermore, rs28470223, which is located within the promoter of HS3ST3A1, was associated in the presence of linkage with parasitaemia. This supports the hypothesis that rs28470223 alters both the expression of HS3ST3A1 and parasitaemia. Functional studies will be required to evaluate whether rs28470223 affects the binding of a transcription factor, and the level of gene expression. However, it cannot be excluded that rs28470223 is in linkage disequilibrium with the causal polymorphism.

Third, given that HS3ST3A1 and HS3ST3B1 encode enzymes with a nearly identical activity, a gene-by-gene interaction analysis was conducted based on the PGMDR approach [28]. Two-, three-, four, and five- locus interactions were systematically evaluated. Seventy-three significant multi-locus models, which included SNPs found in both HS3ST3A1 and HS3ST3B1, were identified. This supports the hypothesis of epistatic interaction between HS3ST3A1 and HS3ST3B1. In addition, 37 out of the 73 significant multi-locus models included rs28470223 located in the promoter of HS3ST3A1, further supporting the hypothesis of a particular role for rs28470223. Other SNPs located in the promoter of either HS3ST3A1 or HS3ST3B1 and synonymous mutations, which may alter gene expression levels, were also included in several significant multi-locus models. Moreover, 38 multi-locus models contained at least one mis-sense mutation. This suggests a possible functional role of rs62636623, rs62056073, rs61729712, and rs9906590, which alter the sequence of amino acids. rs62056073, rs61729712, and rs9906590 are of major interest because they affect the sulphotransferase domain, suggesting that they may alter the enzymatic activity. Interestingly, site-directed mutagenesis experiments have demonstrated that several amino acid changes in the sulphotransferase domain dramatically reduce the enzymatic activity [40]. In addition, rs62056073, rs61729712, and rs9906590 are close to known mutations that result in the loss of the enzymatic activity [40].

In all, the results suggest that several SNPs within HS3ST3A1 and HS3ST3B1, the genes encoding 3-OST-3A1 and 3-OST-3B1, may cause variations in either gene expression levels or the enzymatic activity, and that this may result in variations in parasitaemia. Two mechanisms may explain how genetic variations in HS3ST3A1 and HS3ST3B1 may result in variations in parasitaemia. Genetic variations in HS3ST3A1 and HS3ST3B1 that alter the 3-O sulphation of HS may affect i) the binding of P. falciparum antigen on host cells and/or ii) the pro-inflammatory response.

Together with previous reports [2–4, 41], the results suggest that variations in the 3-O sulphation catalyzed by 3-OST-3A1 and 3-OST-3B1 may affect both the binding of P. falciparum antigen on host cells and the parasite invasion rate. Highly sulphated HS has been shown to promote a productive invasion of cells by P. berghei sporozoites, whereas sporozoites migrate through cells harbouring low sulphated HS [2]. Since the 3-O sulphation is the last step of HS synthesis and occurs after the 2-O and 6-0 sulphation steps, one might assume that highly sulphated HS involved in the sporozoite invasion is 3-O sulphated. This hypothesis is consistent with the data showing that 2-O, 3-O, and N sulphate moieties participate in sporozoite CSP binding [41]. Although the N-sulphation has been shown to be involved in rosette disruption [4–6], and although the O-sulphation has not been reported to influence either the binding of P. falciparum antigen on the human erythrocyte surface or the merozoite invasion rate [3], the results showing the inhibition of merozoite invasion by heparin and other highly sulphated glycoconjugates [42, 43], and those showing the influence of the O-sulphation on hepatocyte invasion by sporozoites makes this hypothesis relevant.

Genetic variations in HS3ST3A1 and HS3ST3B1 might also alter the immune response, and more specifically, the inflammatory response. Indeed, pro-inflammatory cytokine and chemokine binding to HS that depends on the sulphation profile of HS controls both the tissue targeting and the local accumulation of cytokines and chemokines [44, 45]. Interestingly, CCR5 (chemokine (C-C motif) receptor 5) up-regulation was associated with the up-regulation of HS3ST3A1 and HS3ST3B1 in humans infected by HIV; the authors suggested either that interaction between HS and CCR5 causes up-regulation, or that the promoters of CCR5, HS3ST3A1 and HS3ST3B1 share a cis-regulatory motif binding the same transcription factor [46]. Since CCR5 and HS3ST3A1 have been associated with HIV infection [12, 47], this suggests an interaction at the genetic level affecting resistance to HIV infection. By extension, this suggests that the interaction between immune genes and genes involved in HS biosynthesis may contribute to resistance against other infectious diseases, such as malaria. Additional investigations are needed to evaluate the role of such genetic interactions, and to elucidate how the sulphation profile of HS determines cytokine and chemokine binding.

Conclusions

This study shows that HS3ST3A1 and HS3ST3B1 are linked to P. falciparum parasitaemia, that rs28470223 within the promoter of HS3ST3A1 is associated with P. falciparum parasitaemia, and that interactions between HS3ST3A1 and HS3ST3B1 polymorphisms alter P. falciparum parasitaemia. The results also indicate that rs28470223 and four mis-sense mutations within HS3ST3B1 strongly contribute to genetic interactions. This study also suggests that other genes involved in HS biosynthesis may affect malaria resistance. In this way, NDST1 that plays a major role in HS biosynthesis is located within the chromosome 5q31-q33, which is linked to P. falciparum parasitaemia [15].

Abbreviations

CCR5:

Chemokine (C-C motif) receptor 5

CSP:

Circumsporozoite protein

GRCh37:

Genome Reference Consortium Human genome build 37

HIV:

Human immunodeficiency virus

HS:

Heparan sulphate

HSV-1:

Herpes simplex virus 1

HSPG:

Heparan sulphate proteoglycan

LD:

Linkage Disequilibrium

MAF:

Minor Allele Frequency

iRBC:

infected red blood cells

PGMDR:

Pedigree-based generalized multifactor dimensionality reduction

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Acknowledgements

We thank all volunteer families of Bobo Dioulasso. We also thank Charles Chapple for critical reading of the manuscript. Assistance from the IGS-CNRS UPR2589 laboratory was greatly appreciated for DNA sequencing, and we particularly thank Jean-Michel Claverie, Chantal Abergel, Sabine Chenivesse, and Stephane Audic for their help.

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Authors and Affiliations

  1. UMR928-TAGC, INSERM, 163 Av de Luminy, Marseille, F-13288, France

    Alexandre Atkinson, Séverine Garnier, Sarwat Afridi & Pascal Rihet

  2. UMR-MD3, 27 Boulevard Jean Moulin, Marseille, F-13385, France

    Francis Fumoux

  3. Aix-Marseille University, Marseille, F-13288, France

    Alexandre Atkinson, Séverine Garnier, Sarwat Afridi, Francis Fumoux & Pascal Rihet

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  1. Alexandre Atkinson
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  2. Séverine Garnier
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  3. Sarwat Afridi
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  4. Francis Fumoux
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  5. Pascal Rihet
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Correspondence to Pascal Rihet.

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The authors declare that they have no competing interests.

Authors' contributions

AA carried out the molecular genetic studies, participated in the sequence alignment and performed the statistical analysis. SG participated in the molecular genetic studies and sequence alignment. SA participated in the statistical analysis. FF participated in the design of the study, and revised the results and the manuscript. PR performed the design of the study, supervised the experiments and the statistical analyses, and wrote the manuscript. All authors read and approved the final manuscript.

Electronic supplementary material

Additional file 1: Primer pairs and annealing temperatures used to amplify HS3ST3A1 and HS3ST3B1. (DOC 32 KB)

12936_2012_2089_MOESM2_ESM.XLS

Additional file 2: The best multi-locus models identified with PGMDR. All the P values were significant after applying a FDR of 5%. (XLS 38 KB)

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Atkinson, A., Garnier, S., Afridi, S. et al. Genetic variations in genes involved in heparan sulphate biosynthesis are associated with Plasmodium falciparum parasitaemia: a familial study in Burkina Faso. Malar J 11, 108 (2012). https://doi.org/10.1186/1475-2875-11-108

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Keywords

Malaria Journal

ISSN: 1475-2875

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