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Genome-wide association study of prevalent and persistent cervical high-risk human papillomavirus (HPV) infection

BMC Medical Genetics volume 21, Article number: 231 (2020) Cite this article

Abstract

Background

Genetic factors may influence the susceptibility to high-risk (hr) human papillomavirus (HPV) infection and persistence. We conducted the first genome-wide association study (GWAS) to identify variants associated with cervical hrHPV infection and persistence.

Methods

Participants were 517 Nigerian women evaluated at baseline and 6 months follow-up visits for HPV. HPV was characterized using SPF10/LiPA25. hrHPV infection was positive if at least one carcinogenic HPV genotype was detected in a sample provided at the baseline visit and persistent if at least one carcinogenic HPV genotype was detected in each of the samples provided at the baseline and follow-up visits. Genotyping was done using the Illumina Multi-Ethnic Genotyping Array (MEGA) and imputation was done using the African Genome Resources Haplotype Reference Panel. Association analysis was done for hrHPV infection (125 cases/392 controls) and for persistent hrHPV infection (51 cases/355 controls) under additive genetic models adjusted for age, HIV status and the first principal component (PC) of the genotypes.

Results

The mean (±SD) age of the study participants was 38 (±8) years, 48% were HIV negative, 24% were hrHPV positive and 10% had persistent hrHPV infections. No single variant reached genome-wide significance (p < 5 X 10− 8). The top three variants associated with hrHPV infections were intronic variants clustered in KLF12 (all OR: 7.06, p = 1.43 × 10− 6). The top variants associated with cervical hrHPV persistence were in DAP (OR: 6.86, p = 7.15 × 10− 8), NR5A2 (OR: 3.65, p = 2.03 × 10− 7) and MIR365–2 (OR: 7.71, p = 2.63 × 10− 7) gene regions.

Conclusions

This exploratory GWAS yielded suggestive candidate risk loci for cervical hrHPV infection and persistence. The identified loci have biological annotation and functional data supporting their role in hrHPV infection and persistence. Given our limited sample size, larger discovery and replication studies are warranted to further characterize the reported associations.

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Background

Human papillomavirus (HPV) is a highly conserved double-stranded DNA virus that has coevolved with human populations for millennia [1]. Over 150 types of HPV have been identified and about 40 types primarily infect stratified cutaneous or mucosal epithelia [2]. HPV infections are among the most common sexually transmitted infections globally [3]. While most infections are cleared naturally by the host’s immune system in ~ 2 years, the infection persists in about 10% of those affected [4]. Persistent infection by high-risk (hr) HPV is a risk factor for many epithelial cancers including head and neck, anal and cervical cancers. Susceptibility to cervical hrHPV infection, its persistence and progression to neoplastic disease are determined by epidemiologic and genetic factors. Many epidemiologic risk factors for cervical hrHPV infection including oral contraceptives, cigarette smoking, multiple sexual partners and co-infection with HIV are well documented [5,6,7,8], however little is known about the genetic risk factors.

Wang et. al evaluated a panel of 7140 candidate single nucleotide polymorphisms (SNP) in 305 candidate genes/regions selected based on a priori hypotheses of their association with HPV infection and cervical cancer, within the population-based Guanacaste cohort in Costa Rica. They reported that SNPs in Deoxyuridine Triphosphatase (DUT), General Transcription Factor IIH Subunit 4 (GTF2H4), 2′-5′-Oligoadenylate Synthetase 3 (OAS3) and Sulfatase 1 (SULF1) gene regions were associated with HPV persistence, while SNPs in the Transmembrane Channel Like (TMC) 6 and TMC8 gene regions were associated with progression to cervical intraepithelial neoplasia (CIN) 3 and cervical cancer [9]. In a subsequent study in the same cohort, the investigators examined 18,310 SNPs in 1113 genes and reported that SNPs in PRDX3 and RPS19 were associated with HPV persistence and progression from persistent HPV infection to CIN3+ [10]. We examined the association between the aforementioned SNPs and prevalent hrHPV infection in African women, and successfully replicated RPS19:rs2305809 and TYMS:rs2342700 [11].

While the previous candidate gene studies have provided insight into the genetic risk of HPV infection and persistence, agnostic approaches such as genome-wide association studies (GWAS), which interrogate the entire genome would be more useful to uncover novel susceptibility loci for cervical hrHPV infections. A GWAS of cervical hrHPV infection, can also identify novel biomarkers and potential therapeutic targets in cervical cancer, however, none have been conducted to date. We therefore conducted this GWAS of cervical hrHPV infections and tested previously reported associations between genes/regions and prevalent and persistent cervical hrHPV infections.

Methods

Study population

We studied 544 women participating in a cohort study of cervical HPV infection and cervical cancer at National Hospital, Abuja and University of Abuja Teaching Hospital, Nigeria, and enrolled between 2012 and 2014, as previously described [5, 12,13,14]. All the study participants were 18 years of age or older, had a history of vaginal sexual intercourse, were not currently pregnant and had no history of hysterectomy. We collected data on socio-demographic characteristics, sexual and reproductive history, and confirmed participants’ HIV status from hospital medical records at study entry. Participants were asked to return for follow-up visits after 6 months, at which time, the history, physical examinations and sample collections were repeated. We collected venous blood samples and performed pelvic examinations on all the study participants at each study visit. Elution swab system (Copan, Italy) was used to collect exfoliated cervical cells, which were inserted in 1 ml Amies’ transport media (Copan).

HPV detection by SPF10/LiPA25

We extracted DNA from the cervical exfoliated cells as previously described [11]. Samples were tested for HPV DNA by hybridization of SPF10 amplimers to a mixture of general HPV probes recognizing a broad range of high-risk, low-risk, and possible hrHPV genotypes in a microtiter plate format, as described previously [15]. All samples determined to be HPV DNA positive by SPF10 DNA Enzyme Immunoassay (DEIA) were genotyped using the LiPA25 version 1. The LiPA25 assay provides type-specific information for 25 different HPV genotypes simultaneously and identifies infection by one or more of 13 hrHPV genotypes: 16, 18, 31, 33, 35, 39, 45, 51, 52, 56, 58, 59, and 68 [16, 17]. However, as this assay does not differentiate between HPV 68 and 73, we defined this HPV genotype (i.e. HPV68/73) as low-risk. We defined hrHPV infection as prevalent if at least one hrHPV genotype was detected in the baseline sample and persistent if at least one hrHPV genotype was detected in samples provided at both the baseline and follow-up visits. We defined persistently negative as absence of hrHPV genotype in the baseline and follow-up visit samples.

Genotyping and imputation

Samples from the study participants were genotyped using the Illumina Multi-Ethnic Global Array (MEGA) which has ~ 1.7 million markers. Sample-level genotype call rate was at least 0.95 for all the study participants. We filtered out from the genotyped dataset SNPs that did not meet the following criteria: autosomal SNPs (n = 78,713), variant missingness < 0.05 (n = 96,410), Hardy-Weinberg equilibrium (HWE) p > 1 × 10–6 (n = 7692) and minor allele frequency (MAF) > = 0.01 (n = 564,791). The resulting 958,363 SNPs that passed these quality control filters had a SNP success rate of 0.9985 and were used as the basis for imputation.

Imputation was performed using the Sanger Imputation Service (https://imputation.sanger.ac.uk/) [18]. Pre-phasing was done with the Eagle2 algorithm [19] and imputation was done with positional Burrows-Wheeler transform (PBWT) [20]. The reference panel used was the African Genome Resources Haplotype Reference Panel, an African genome imputation reference panel based on 9912 haplotypes (4956 samples) which includes all African and non-African 1000 Genomes Phase 3 populations and additional African genomes from Uganda, Ethiopia, Egypt, Namibia and South Africa (including 2298 African samples with whole genome sequence data from the African Genome Variation Project (AGVP) [21] and the Uganda 2000 Genomes Project (UG2G) [22]. The IMPUTE2 INFO score was used as a quality metric to evaluate the uncertainty in genotype imputation. Imputation yielded a total number of ~ 104 million markers. We filtered the resulting imputation dataset for variants with info score ≥ 0.3 and MAF ≥ 0.01, with a final set of ~ 18 million SNPs which was used for association analysis.

Statistical analysis

From the original set of 544 women, we excluded 27 women from the baseline analyses because of incomplete data (5 missing HPV, 22 missing both HPV and HIV results), leaving only 517 women in the baseline analyses. Of the 517 women, we excluded those who did not return for the follow-up visit (n = 9), those with missing HPV results (n = 35) and included the remaining 473 women in the analyses for persistent hrHPV infections. For the prevalent hrHPV analysis, we compared 125 women with cervical hrHPV infections (cases) to 392 women without cervical hrHPV infections at baseline (controls). For the persistent hrHPV analysis, we compared 51 women with hrHPV infection at both the baseline and follow-up visits (cases) to 355 women without hrHPV infections at either the baseline or follow-up visits (controls). Using LD-pruned SNP genotype data available on the same women, we computed principal components based on the variance-standardized relationship matrix with PLINK 1.9 [23, 24] using the parameters “--indep 50 5 2” , namely with a window size of 50 SNPs, 5 SNPs to shift the window at each step and a variance inflation factor of 2. We found that the first principal component was significant in the test for population differentiation and included it in downstream association analyses. The association between the genetic variants and prevalent or persistent hrHPV infection was estimated using unconditional multivariate logistic regression, assuming an additive genetic model adjusted for age, HIV status and the first principal component. Genome-wide significance was set at p-value < 5 × 10− 8. We used an additive genetic model adjusted for HIV status to test for replication of SNPs associated with HPV and cervical neoplasia in other populations and considered p-values < 0.05 as statistically significant evidence for replication. The analyses were conducted using PLINK.

Results

The mean (±SD) age of the participants was 38 (±8) years while their mean (±SD) body mass index (BMI [kg/m2]) was 27 (±6). About half of the participants were HIV positive (52%, 270/517), 24% (125/517) had prevalent cervical hrHPV infections at baseline and 11% (51/473) had persistent hrHPV infections. The distribution of type-specific prevalent and persistent cervical hrHPV infections is shown in Table 1. Non HPV16/18 were more prevalent in the study population. The prevalence of HPV16 and HPV18 in the study population were 2% (10/517) and 4% (8/517), respectively. About 8% (10/125) of the women with cervical hrHPV infections had HPV16 and 16% (20/125) had HPV18 at baseline. HPV52 and HPV35 were the most prevalent HPV genotypes in the study population. About 7% (37/517) of the study population had HPV52, which accounted for about a third of the HPV positive infections at baseline. HPV52 and HPV35 were also more likely to persist, compared to the other hrHPV types. About 19% of the participants had single cervical hrHPV infections and ~ 9% of the participants had multiple cervical hrHPV infections at both visits. Participants returned for follow-up visits at a median (IQR) time of 5.7 (5.4–7.5) months.

Table 1 Distribution of Type-Specific Prevalent and Persistent Cervical High-Risk (hr) HPV Infections by HIV status
Full size table

The Manhattan plot, Fig. 1, shows all the SNPs and Table 2 shows the top 20 SNPs associated with prevalent cervical hrHPV infections. A cluster of SNPs (D’ = 1, r2 = 1) located on chromosome 13, rs149473200, rs147344426 and rs151071053 (Odds Ratio [OR], p-value for all SNPs was OR: 7.06, p = 1.43 × 10− 6), had the strongest association with cervical prevalent hrHPV. The regional plot for rs149473200 in Fig. 1 shows that the cluster of SNPs are intronic in Krüppel-like Factor 12 gene (KLF12) and shows the surrounding markers. SNPs near Long Intergenic Non-Protein Coding RNA 290 gene (NCRNA00290) also had a borderline genome-wide significant association with prevalent hrHPV.

Fig. 1
figure 1

Genome-wide association results for prevalent high-risk HPV. λ = 1.02. a Manhattan plot (b) Quantile–quantile plot (c) Regional plot for rs149473200

Full size image
Table 2 Associations of the Top 20 SNPS with Prevalent Cervical high-risk Infections
Full size table

The SNP with the strongest association was located on Chr5:10847898, OR: 6.86, p = 7.15 × 10− 8, Table 3. This variant has not been included in the 1000 Genomes data resources. However, we found that the variants surrounding this region, Chr5:10847888–10,847,902, are located between Death Associated Protein gene (DAP) and Catenin Delta 2 (CTNND2) genes. Figure 2 shows a Manhattan plot and a regional plot of association with persistent cervical hrHPV infections. Other top variants associated with persistent hrHPV infections were rs200516199 upstream of MicroRNA 365b gene (MIR365–2), OR: 7.71, p = 2.63 × 10− 7; variants clustered upstream of Nuclear Receptor Subfamily 5 Group A Member 2 gene (NR5A2) and Junctophilin Type 2 gene (JPH2). Next, we conducted a replication study by identifying all SNPs associated with HPV and cervical neoplasia in other studies (Supplementary Table 1) and evaluated their association with hrHPV in the present study, using an adjusted additive genetic model. We found rs9893818 (OR: 0.88, p = 0.58 for prevalent hrHPV; OR: 0.92, p = 0.82 for persistent hrHPV) and rs2299187 (OR: 0.95, p = 0.86 for prevalent hrHPV; OR: 1.13, p = 0.71 for persistent hrHPV) in our dataset but they were not significantly associated with prevalent or persistent cervical hrHPV infections (Supplemental Table 2). Lastly, we conducted stratified analysis by HIV status and found that none of the variants reached genome-wide statistical significance (Supplemental Tables 3 and 4).

Table 3 Associations of the Top 20 SNPS with Persistent Cervical high-risk Infections
Full size table
Fig. 2
figure 2

Genome-wide association results for persistent high-risk HPV. λ = 1.00. a Manhattan plot (b) Quantile–quantile plot (c) Regional plot for rs116834259

Full size image

Discussion

This is the first GWAS of cervical hrHPV infection, to our knowledge. The top three variants associated with prevalent cervical hrHPV infection were clustered in KLF12, while those associated with persistent cervical hrHPV infection were near DAP, CTNND2, MIR365–2 and NR5A2. These associations were borderline genome-wide significant. It is well established that the determinants of prevalent and persistent cervical hrHPV infections are different. Our finding of separate variants associated with prevalent and persistent cervical hrHPV suggests that their genetic risk factors may also differ.

The associated SNPs in KLF12, rs149473200 and rs147344426, are eQTLs of CD3e molecule (CD3E), a protein coding gene which plays an essential role in T-cell development and its defects cause immunodeficiency. KLF12, a protein coding gene, is overexpressed in human B and T lymphocytes, CD8 T cells and natural killer cells [25]. These cells play important roles during immune response to hrHPV infection, including recognizing and destroying infected cells. hrHPV causes the immune system to become more tolerant to infection by avoiding cytolysis of host cells, inhibiting interferon synthesis and cytotoxic T cell function, and inducing regulatory T cell infiltration [26,27,28]. This creates a cervical microenvironment that is susceptible to persistent infection and carcinogenesis. KLF12 has been linked to several cancers [29,30,31,32], including head and neck cancers [33, 34], which are usually associated with hrHPV. A study of HPV integration breakpoints in the human genome showed that a copy of the virus was integrated between KLF5 and KLF12 in HPV-positive SiHa cells [35]. Recently, a whole-genome sequencing study on HPV-positive SiHa, HeLa and cervical carcinoma cells showed KLF12 was one of the top three integration sites for HPV [36]. Thus, KLF12 may play a major role in the underlying mechanisms that lead to hrHPV infection, persistence and cervical carcinogenesis.

A locus between CTNND2 and DAP in the short arm of chromosome 5, had the strongest association with persistent cervical hrHPV infections in the present study. CTNND2 gene encodes an adhesive junction associated protein and is overexpressed in the cervix [25]. It has been implicated in cancer formation and has been linked to breast and ovarian cancers [37,38,39]. DAP encodes a basic, proline-rich protein which acts as a positive mediator of programmed cell death that is induced by interferon-gamma [40]. It negatively regulates autophagy and is a substrate for mammalian target of rapamycin (mTOR) [41], which regulates different cellular processes. Results from GWASs show that DAP is associated with digestive disorders, gut microbiota, height and obesity [42,43,44,45]. There is some evidence that this gene plays a pro-apoptotic role in breast and cervical cancers [46,47,48]. Esteller et. al. showed that hypermethylation of the CpG islands located in the promoter region of DAP leads to transcriptional silencing thereby enabling malignant growth [49].

rs200516199 and rs143668247 near MIR365–2 and NR5A2 (LRH-1), respectively, were also associated with persistent cervical hrHPV infections. Like CTNND2 and DAP, MIR365–2 has also been linked to breast and cervical cancers [50, 51]. It appears to have an oncogenic effect in some cancers [52, 53] and tumor suppressor effect in others [54,55,56,57]. Bioinformatics and experimental research studies have proved that apoptotic markers BAX and BCL-2, are two of the main targets of this microRNA [58, 59]. rs143668247 alters motifs in POU Class 5 Homeobox 1 (POU5F1) gene. Aberrant expression of this gene in adult tissues is associated with tumorigenesis [37]. rs143668247 is located 295 kb 5′ of NR5A2, an orphan receptor recently identified as a negative modulator of hepatic inflammatory processes [60]. It encodes a protein which is highly expressed in the liver and is involved in regulating the expression of genes for lipid metabolism, hepatitis B virus [61, 62] and several cancers [63,64,65,66,67,68,69]. Although these genes have not been previously linked to HPV infection, subsequent GWAS may confirm our findings.

Our study is limited by its exploratory nature. Given the small sample size of this study the power of the study was limited. Thus, we may have missed associations with smaller effect sizes and we could not examine the relationship between variants and type-specific hrHPV and by HIV status. Our replication study yielded two SNPs, TMC6/TMC8:rs9893818 which was reported to be associated with CIN3/cervical cancer [9] and CACNA2D1:rs2299187, which was associated with survival of head and neck squamous cell carcinoma in a recent GWAS [70]. However, these variants were not associated with hrHPV in our study. Also, rs7082598 variant in PRDX3 and rs2305809 variant in RPS19, which were shown to be associated with HPV persistence in a candidate gene study conducted within Guanacaste cohort in Costa Rica, were not associated with hrHPV in our study. This may be due to inadequate sample size, variability in the types of hrHPV or population differences. Unlike our study population which was comprised of only African women, the population of Guanacaste is heavily admixed and has been described as being composed mainly of European (42.5%) and Native American (38.3%) ancestries, with considerable African influence (15.2%) and a small influence from Asians (4%) [71]. The frequency of rs7082598 is 0.14 (AFR), 0.11 (AMR), 0.04 (ASN) and 0.08 (EUR) [72], our study may have been underpowered to detect an association with this variant. The frequency of rs2305809 is 0.89 (AFR), 0.52 (AMR), 0.56 (ASN) and 0.48 (EUR) [72], suggesting that most African women have this variant regardless of their HPV status, which is most likely why we were unable to detect an association between rs2305809 and HPV in our study population. The findings from this exploratory study suggests that there are significant associations between genetic variants and cervical hrHPV infection and larger studies are warranted. The strengths of our study include studying a well-characterized longitudinal cohort with multiple hrHPV assessments in the participants. Secondly, the main loci identified have biological and functional support for a role in HPV infection and persistence. Lastly, the variant frequencies we observed were similar between our samples and those of west African ancestry samples in the 1000 Genomes dataset, validating the genotype accuracy in our datasets.

Conclusion

In conclusion, our study yielded suggestive genetic risk factors for prevalent and persistent cervical hrHPV infections. Further investigations of genetic variation in the KLF12, CTNND2 and DAP genes may provide insight into mechanisms of susceptibility to hrHPV infection and persistence. Larger discovery and replication studies are warranted to confirm these findings.

Availability of data and materials

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

Abbreviations

AGVP:

African Genome Variation Project

BMI:

Body mass index

CIN:

Cervical intraepithelial neoplasia

DEIA:

DNA Enzyme Immunoassay

GWAS:

Genome-wide association studies

HPV:

Human papillomavirus

hrHPV:

High-risk Human Papillomavirus

HWE:

Hardy-Weinberg equilibrium

IQR:

Interquartile range

MAF:

Minor allele frequency

MEGA:

Multi-Ethnic Global Array

OR:

Odds ratio

PBWT:

Positional Burrows-Wheeler transform

SNP:

Single nucleotide polymorphisms

UG2G:

Uganda 2000 Genomes Project

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Acknowledgments

We are very grateful to the women who participated in this study. We acknowledge the past and present members of the H3Africa ACCME Research Group, Research Associates and Volunteers who contributed to this study, especially Dareng E, Famooto A, Obende K, Adebayo A, Ologun S, Alabi B, Achara P, Bakare R, Dakum P. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Cancer Institute, or the National Institutes of Health.

Funding

This work was supported by the UM-Capacity Development for Research in AIDS Associated Malignancy Grant (NIH/NCI 1D43CA153792–01) and African Collaborative Center for Microbiome and Genomics Research Grant (NIH/NHGRI 1U54HG006947). Sally Adebamowo is funded by the American Cancer Society IRG-18-160-16.

The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscripts.

Author information

Authors and Affiliations

  1. Department of Epidemiology and Public Health, University of Maryland School of Medicine, 660 West Redwood Street, Howard Hall, Room 119, Baltimore, MD, 21201, USA

    Sally N. Adebamowo & Clement A. Adebamowo

  2. University of Maryland Greenebaum Comprehensive Cancer Center, University of Maryland School of Medicine, Baltimore, MD, USA

    Sally N. Adebamowo & Clement A. Adebamowo

  3. Center for Research on Genomics and Global Health, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD, USA

    Adebowale A. Adeyemo & Charles N. Rotimi

  4. Department of Obstetrics and Gynecology, National Hospital Abuja, Abuja, Nigeria

    Olayinka Olaniyan

  5. Department of Obstetrics and Gynecology, University of Abuja Teaching Hospital, Abuja, Nigeria

    Richard Offiong

  6. Institute of Human Virology, University of Maryland School of Medicine, Baltimore, MD, USA

    Clement A. Adebamowo

  7. Institute of Human Virology Nigeria, Abuja, Nigeria

    Clement A. Adebamowo

Authors
  1. Sally N. Adebamowo
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  2. Adebowale A. Adeyemo
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  3. Charles N. Rotimi
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  4. Olayinka Olaniyan
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  5. Richard Offiong
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  6. Clement A. Adebamowo
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Consortia

for the H3Africa ACCME Research Group

  • Michael Odutola
  • , Eileen O. Dareng
  • , Ayotunde O. Famooto
  •  & Ruxton Adebiyi

Contributions

SA analyzed the data, interpreted the results and drafted the manuscript. AA contributed to the data analysis. OO and RO provided clinical oversight for the study. CA obtained funding for this study. AA, OO, RO, CR and CA provided critical revisions to the manuscript. All the authors contributed to the study implementation and approved the final version of the manuscript.

Corresponding author

Correspondence to Sally N. Adebamowo.

Ethics declarations

Ethics approval and consent to participate

The study was conducted according to the Nigerian National Code for Health Research Ethics. Ethical approval to conduct this study was obtained from the Institute of Human Virology Nigeria research ethics committee and University of Maryland School of Medicine Institutional Review Board. Written informed consent was obtained from all participants before enrollment in the study.

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

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Supplementary Information

Additional file 1: Supplemental Table S1

.

Additional file 2: Supplemental Table S2

. Replication of SNPs Associated with Cervical high-risk Infections.

Additional file 3: Supplemental Table S3

. Associations of the Top SNPS with Cervical High-risk Infections in HIV-Negative Women.

Additional file 4: Supplemental Table S4

. Associations of the Top SNPS with Cervical High-risk Infections in HIV-Positive Women.

Additional file 5: Supplementary Figure S1

. Principal components (PC) plot of the genotypes of the study participants.

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Adebamowo, S.N., Adeyemo, A.A., Rotimi, C.N. et al. Genome-wide association study of prevalent and persistent cervical high-risk human papillomavirus (HPV) infection. BMC Med Genet 21, 231 (2020). https://doi.org/10.1186/s12881-020-01156-1

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