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Presence of additional Plasmodium vivax malaria in Duffy negative individuals from Southwestern Nigeria

Abstract

Background

Malaria in sub-Saharan Africa (sSA) is thought to be mostly caused by Plasmodium falciparum. Recently, growing reports of cases due to Plasmodium ovale, Plasmodium malariae, and Plasmodium vivax have been increasingly observed to play a role in malaria epidemiology in sSA. This in fact is due to the usage of very sensitive diagnostic tools (e.g. PCR), which have highlighted the underestimation of non-falciparum malaria in this sub-region. Plasmodium vivax was historically thought to be absent in sSA due to the high prevalence of the Duffy negativity in individuals residing in this sub-continent. Recent studies reporting detection of vivax malaria in Duffy-negative individuals from Mali, Mauritania, Cameroon challenge this notion.

Methods

Following previous report of P. vivax in Duffy-negative individuals in Nigeria, samples were further collected and assessed RDT and/or microscopy. Thereafter, malaria positive samples were subjected to conventional PCR method and DNA sequencing to confirm both single/mixed infections as well as the Duffy status of the individuals.

Results

Amplification of Plasmodium gDNA was successful in 59.9% (145/242) of the evaluated isolates and as expected P. falciparum was the most predominant (91.7%) species identified. Interestingly, four P. vivax isolates were identified either as single (3) or mixed (one P. falciparum/P. vivax) infection. Sequencing results confirmed all vivax isolates as truly vivax malaria and the patient were of Duffy-negative genotype.

Conclusion

Identification of additional vivax isolates among Duffy-negative individuals from Nigeria, substantiate the expanding body of evidence on the ability of P. vivax to infect RBCs that do not express the DARC gene. Hence, such genetic-epidemiological study should be conducted at the country level in order to evaluate the true burden of P. vivax in Nigeria.

Background

Malaria is a critical infectious disease of public health importance that provokes considerable mortality in all endemic countries. The tremendous gains seen in cases and mortality reduction is as a result of deliberate intervention strategies [1]. However, the observed benefits have seen a plateau in the last 2 years especially in Africa, where, the greatest burden of disease is mostly impacted. In sub-Saharan Africa (sSA), the majority (99%) of the malaria infections is thought to be due to Plasmodium falciparum and, rarely by Plasmodium ovale, Plasmodium malariae, while Plasmodium vivax is not even considered as one of the players [1] in shaping malaria epidemiology in sSA. With the availability of tools that are more sensitive, the detection of non-falciparum and even vivax human malaria parasites has gained more attention in sSA [2,3,4,5,6].

Historically, P. vivax prevails in Asia, [7, 8], South America [9, 10] and has some scanty presence in the Horns of Africa, such as in Djibouti [11], Eritrea [12], Somalia [13, 14], Ethiopia [15,16,17,18] and Sudan [19, 20]. Thus, P. vivax has a much wider geographical distribution outside of Africa unlike falciparum malaria. Hence, the former notion that P. vivax originates from Asia and South America, then gradually finds its way into Africa through the trade-route corridor is being opposed by current evidences. These recent proofs support the hypothesis that, P. vivax could have originally evolved from a vivax-like strain detected in non-human primates in Africa [21, 22] and, from there dispersed to other continents during the period of human migration. Although, both hypotheses (whether from Africa to Asia or, Asia to Africa) require further validation. Notwithstanding that, it seems likely that there might be an interplay of both hypotheses, in which case, simultaneous occurrence and selective adaptation of the Duffy negative allele in sSA might have resulted in the absence of vivax malaria in the region. Nonetheless, later re-introduction of P. vivax into sSA might have happened when individuals expressing the Duffy null allele travels between continents and countries where P. vivax is endemic.

The Duffy (gp-FY; CD234) gene is the fourth red blood cell (RBC) gene after thalassemia, sickle cell anaemia and glucose-6-phosphate dehydrogenase (G6PD) associated with resistance to Plasmodium species [23] albeit with particular protection against vivax malaria. Also known as the Duffy antigen receptor for chemokines (DARC), it is a variable receptor usually expressed on the surface of the red blood cell (RBC) and employed by P. vivax merozoites in gaining access in the RBCs and establishing its erythrocytic infection [24]. DARC which is located on chromosome 1 has two exons and a single nucleotide substitution from a thymine (T) to a cytosine (C) upstream of the promoter region that nullifies the expression on RBCs ultimately resulting in the FYO* allele [25]. This FYO* null allele predominates amongst sSA inhabitants as with African-Americans but, has a very sparse representation in individuals of other ancestry [26]. Thus, the FYO* null allele has been validated to confer protection against P. vivax infection [23] in this sub-region. Nevertheless, 11 countries in this region (Oboh et al. unpublished) have reported the occurrence of P. vivax making it more real that vivax malaria might be gradually finding its way into sSA, and it can, therefore, be postulated that hidden transmission is occurring in this region. In some of these studies, such as in those conducted in Angola, Cameroon, Kenya, Madagascar, Mali and Mauritania, the Duffy status of the infected individuals was characterized and they were found to be mostly Duffy negative [3, 4, 27,28,29,30]. In others, however, the investigators were concerned with the identification of P. vivax without stating the Duffy status of the infected individuals [5, 31,32,33]. Interestingly, all studies were carried out amongst indigenous individuals with little or no travel history to other vivax endemic areas. Therefore, the possibility of imported infection can be ruled out.

In Nigeria, P. falciparum is responsible for > 95% of malaria infection, with P. malariae and P. ovale contributing a meagre < 5% of infection [1, 34]. Data implicating P. vivax infection in Nigeria include its detection in a visiting pregnant female [35] and, two cases detected by microscopy [36, 37], both of which were not confirmed by any molecular technique. Nevertheless, evidence from previous data molecularly (by PCR) confirmed [6] five Duffy negative individuals to be infected with P. vivax isolates from Nigeria. Interestingly, all the vivax malaria cases had been subsequently confirmed by capillary sequencing. Thus, as a follow-up to our previous study, samples were collected from two sites—Oredo and Kosofe in Edo and Lagos state and evaluated with the classical PCR method. In order to confirm these additional P. vivax isolates (both single and mixed infection), sequencing by Big Dye Terminator was done. In addition, the Duffy status of the individuals was determined. The importance of such genomic epidemiological studies cannot be underestimated in this era of malaria elimination, as attention also needs to be given to non-falciparum infection, if the ambitious, albeit achievable 2030 elimination goal is to be reached.

Methods

Ethical approval for this study was obtained from the Institutional review board of the Nigerian Institute of Medical Research and only consenting individuals were enrolled in the study.

Blood samples were purposefully collected from all symptomatic patients attending two hospitals in Lagos (Gbagada) and Edo (Central) states within the study duration (December 2016–January 2017). Patients were recruited if they are ≥ 2 years and, do not have any severe medical conditions, while pregnant women and nursing mothers were excluded from the study. Samples were quickly subjected to malaria rapid diagnostic test kit, employing the manufacturer’s instruction (Pf-HRPII- Care Start®, Access Bio Inc, Batch number M014L04-M014M10) followed by microscopy by a World Health Organization (WHO) expert microscopist. Two dried blood-spots (DBS) per patient per filter paper (242 in total), irrespective of their status (positive or negative by any of the techniques above) were made on Whatmann® (GE Healthcare, Life Sciences) filter paper. All DBS were brought to the ICMR-National Institute of Research in Tribal Health (ICMR-NIRTH), Jabalpur, India, where all molecular including DNA sequencing work have been conducted.

Employing the Qiagen® Mini kit (the QIAamp DNA Blood Mini Kit; Hilden, Germany), genomic DNA was isolated from all 242 samples and subsequently subjected to nested PCR diagnostic protocol targeting the 18S rRNA to identify all four Plasmodium infecting species using primer pairs as designed earlier [38]. For each PCR run, a negative control (nuclease free water) and positive controls (sequenced confirmed Plasmodium species-for all four species) were added. In addition, a part of the promoter region of Duffy gene (for isolates that are P. vivax positive) was PCR amplified and sequenced in order to determine their Duffy status using protocols and primer sequence detailed in our previous work [6]. Representative isolates of Plasmodium species (P. falciparum, P. vivax, P. malariae and P. ovale) were purified (using FastAP alkaline phosphatase and exonuclease I) and processed for sequencing by Sanger method (an in-house facility of ICMR-NIRTH, Jabalpur) in both direction (2X coverage). Sequencing was performed on the purified PCR products in a volume of 10 µl with 0.5 µl of Terminator ready reaction mix (TRR), 1.6 pmol of gene specific primer and 5X reaction buffer with a cycling condition of 96 °C denaturation for 10 s (25 cycles), annealing at 50 °C for 5 s and an extension of 60 °C for 4 minutes. Base calling of nucleotide and chromatogram visualization was achieved using the sequence analysis software accompanying the DNA analyser (Sequence analyser™), while sequence alignment was carried out with BioEdit sequence alignment editor v.7.0.5.3. Contiguous sequences were aligned with their respective reference strains (P. vivax-SAL-1 accession number U03079.1; P. falciparum-3D7 accession umber XR_002273095.1; P. ovale-accession number L48987.1; P. malariae-accession number NG_011626.30 and, the Duffy gene; accession number NG_011626.30). In addition, the positive predictive value, negative predictive value and Kappa’s test statistics were determined for each diagnostic tool in order to evaluate their performance.

Results

Between December 2016 and January 2017, a total of two hundred and forty-two samples were collected from both study areas, with majority of the samples (171) being from Oredo in Edo State. The mean age group from both localities are almost the same, 25 years in Kosofe and 26 years in Oredo. As with the mean age, the ratio of male to female is almost same (1:1.2) (Table 1). All 242 samples were subjected to the three diagnostic tools (RDT, microscopy and PCR) and the outcome were widely different. While RDT (187) and PCR (145) gave the highest positive results, that of microscopy was abysmally poor detecting only 53 positive isolates. Thus, using PCR as the gold standard RDT gave a higher sensitivity (84.8%), although with a low specificity (34%). On the other hand, the specificity of microscopy was remarkably higher (82.5%) than what was obtained by RDT.

Table 1 Background information of the study participants

A converse pattern was noticed with regards to the likelihood of a positive or negative sample being correctly identified as such. For RDT, the chances of a positive samples turning out positive by PCR-positive predictive value (PPV) was lower (65.8%) than what was observed with microscopy (67.9%) while the chances of it being picked as truly negative; negative predictive value (NPV) was high (60%)(Table 2).

Table 2 Diagnostic performance of the different tools

As expected, P. falciparum was the most abundant malaria species detected in both localities (106 in Oredo and 27 in Kosofe). The occurrence of other species in both states were rare either in single (one P. malariae, one P. ovale, three P. vivax) or mixed infections (six P. ovale/P. falciparum, one P. falciparum/P. vivax –1) (Fig. 1). The gDNA of the identified P. vivax isolates were re-extracted and amplified twice following a protocol described earlier [6] in order to be sure of their status. Gel documentation of all newly identified isolates is presented in Fig. 2.

Fig. 1
figure1

Proportional dynamics of Plasmodium species in both study locations

Fig. 2
figure2

Gel documentation of various Plasmodium species. a First well—DNA base pair ladder (100 bp), well 2: NC- negative control template (distill water), well 3- PC-P. falciparum positive control, well 4-9- isolates of P. falciparum, well 10- DNA base pair ladder, wells 11 and 12- negative and positive controls of P. vivax, wells 13-16- P. vivax samples, well 17- DNA base pair ladder (100 bp), 18 and 19- negative and positive controls of P. malariae, well 20- the only additional P. malariae detected. b well 1- DNA base pair ladder (100 bp), wells 2 and 3- negative and positive controls of P. ovale, wells 4-7- P. ovale isolates

Surprisingly, all P. vivax isolates sequences showed perfect homology (100% similarity) with their references (Fig. 3 for P. vivax).

Fig. 3
figure3

Multiple sequence alignment of P. vivax isolates after clean-up and trimming with its Sal -1 reference sequence

In order to discern the Duffy status of those P. vivax infected patients, a portion of the DARC gene (precisely the promoter region covering the T33C point mutation) was amplified and sequenced following previous protocol [39]. Unanticipatedly, all four patients infected with P. vivax carried a single cytosine (C) peak at the 33rd nucleotide position upstream (Fig. 4), confirming that none of them expressed the Duffy gene on their RBCs and as such are Duffy negative.

Fig. 4
figure4

Multiple sequence alignment of the Duffy gene of the vivax samples displaying the—T33C nucleotide change which validates their Duffy negative status

Discussion

Plasmodium genomic DNA was amplifiable in more than half of the isolates. Non-amplification of other samples including those positive by microscopy could be due to a number of reasons from low parasite concentration, mutation in the annealing sites of the target gene to PCR technical inhibition. The identification of more P. vivax isolates among these Duffy-negative individuals from Nigeria substantiate the expanding body of evidence of the ability of P. vivax to infect RBCs that do not express the DARC gene. Although, a very recent finding points to another domain on the reticulocyte-transferring receptor 1 as a specific P. vivax receptor [40] on the reticulocyte. This is being proposed to be an alternate route of entry by P. vivax into the RBCs, however, there is need for further verification. The above hypothesis is one of the proposition being made to support the observation of P. vivax in sSA [41]. Another which relies on the first conjecture (assuming it is agreed that P. vivax at least possesses alternative invasion pathway), is that the Duffy positive carriers in northern part of Africa and the Afro-Asiatic populations of Sudan, Somalia [20, 42] and Ethiopia [43, 44] serve as reservoir to effect transmission to Duffy negative individuals in those areas as well as other countries (in sSA) through migration. Albeit, this particular hypothesis at play here is yet to be determined. One thing is clear here, the true epidemiological situation of P. vivax in sSA in particular and Africa in general is yet to be ascertained.

The detection of additional vivax malaria is not unexpected as cases of P. vivax have been identified in many countries in sSA [3,4,5, 29, 33, 45,46,47,48] including Nigeria [6], where, it was thought to be absent due to the non-expression of the DARC gene on the RBC of majority of the population. Thus, this is adding to the growing evidence of the proposed gradual incursion of P. vivax into sSA sub-region.

Although this study is limited in its samples size and location, the results give support on the need to re-evaluate the spread of P. vivax in sSA. Therefore, it is pertinent to carry out more genetic-epidemiological studies in other areas (for example this study covers only two states out of the thirty-six in Nigeria) of the country as with other sSA countries. This will aid in placing appropriate control strategies to combat the menace of malaria infection in this most affected population and may prevent further spread of P. vivax in Africa.

Availability of data and materials

The datasets supporting the conclusion of this article is available in Genbank (MT515456-MT515459 and MT550678-MT550681). All other data can be made available on request to the authors

Abbreviations

sSA:

sub-Saharan Africa

PCR:

Polymerase Chain Reaction

DARC:

Duffy Antigen Receptor for Chemokines

RBC:

Red blood cell

G6PD:

Glucose-6-Phosphate Dehydrogenase Deficiency

TRR:

Terminator ready reaction mix

RDT:

Rapid diagnostic test

PPV:

Positive predictive value

NPV:

Negative predictive value

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Acknowledgements

We thank all the study participants for consenting to donate blood samples for this study. Thanks are also due to the Rector of the Université Cheikh Anta Diop de Dakar, Senegal and Director of ICMR-National Institute of Research in Tribal Health (NIRTH) for providing instrumental facilities. We thank Mrs. Ayanlere, Central Hospital, Nigeria, and Mr. Agbayewa, Ikate Primary Health Care, Nigeria for helping in the collection of samples and Mr. Sri Krishna and Ms. Priyanka Patel, ICMR-NIRTH, India for assistance in the laboratory.

Funding

This work was graciously funded by the Department of Science and Technology, and Ministry of External Affairs (MEA), Government of India (GoI), and the Federation of Indian Chambers of Commerce and Industry (FICCI) for awarding the Visiting Fellowship under the CV Raman Fellowship scheme.

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Authors

Contributions

MAO and AD conceptualised and designed the study. MAO, NZ and PKB carried out laboratory analysis. MAO analysed data. MAO and AD wrote manuscript with inputs from the other authors. All authors read and approved the final manuscript.

Corresponding authors

Correspondence to Mary Aigbiremo Oboh or Aparup Das.

Ethics declarations

Ethical approval and consent for participate

Approval (IRB/16/347) for this study was obtained from the Institutional Review Board of the Nigerian Institute of Medical research.

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

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Oboh, M.A., Singh, U.S., Ndiaye, D. et al. Presence of additional Plasmodium vivax malaria in Duffy negative individuals from Southwestern Nigeria. Malar J 19, 229 (2020). https://doi.org/10.1186/s12936-020-03301-w

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Keywords

  • Sub-Saharan Africa
  • Duffy Antigen Receptor for Chemokines
  • Plasmodium vivax
  • Mix-infection
  • Genetic-epidemiology