Abstract
Taking a genome-wide association study approach, we identified inherited genetic variations in ACYP2 associated with cisplatin-related ototoxicity (rs1872328: P = 3.9 × 10−8, hazard ratio = 4.5) in 238 children with newly diagnosed brain tumors, with independent replication in 68 similarly treated children. The ACYP2 risk variant strongly predisposed these patients to precipitous hearing loss and was related to ototoxicity severity. These results point to new biology underlying the ototoxic effects of platinum agents.
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Change history
13 March 2015
In the version of this article initially published, the authors neglected to acknowledge that the work was also supported by US National Institutes of Health grant R01 CA154619. The error has been corrected in the HTML and PDF versions of the article.
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Acknowledgements
We thank S. Throm for coordinating patient samples, S. Hughes for curating the ototoxicity data, all patients and their parents who participated in the St. Jude protocols included in this study, G. Koh (National University of Singapore) for her assistance in genome-wide genotyping, and L. Robison and K. Ness (St. Jude Children's Research Hospital) for insightful discussions. This work was supported by the US National Institutes of Health (P30 CA21765-34, U01 GM92666 and R01 CA154619) and the American Lebanese Syrian Associated Charities (ALSAC).
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J.J.Y. and C.F.S. supervised the research. A.G., G.W.R., A.B., M.C., U.B., S.G., T.H., M.F. and R.C. provided the study materials or patients. G.W.R., J.K.B., A.G., C.F.S., J.Y.-S.L., H.Z., T.T. and T.Y. collected and assembled the data. H.X., A.O.-T., J.H., J.Y.-S.L. and J.Z. analyzed and interpreted the data. All authors wrote and approved the manuscript.
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Integrated supplementary information
Supplementary Figure 1 SJMB96 and SJMB03 treatment protocols.
Children with newly diagnosed brain tumors (primarily medulloblastoma) were enrolled on these two frontline protocols between 1996–2003 and 2003–2012, respectively. Patients were first treated with different dosages of irradiation depending upon risk groups, followed by four cycles of cisplatin-containing chemotherapy.
Supplementary Figure 2 Flowchart of patients' inclusion/exclusion for the genetic analyses in the discovery GWAS series (SJMB96 and SJMB03).
Patients were included in the GWAS series on the basis of the availability of germline DNA and audiology assessments, and no significant difference was observed in demographic or clinical features between patients included and excluded.
Supplementary Figure 3 Ototoxicity onset in SJMB96 and SJMB03.
The majority of ototoxic events occurred within 6 months of the initiation of cisplatin therapy; 60% of the children had detectable hearing loss (Chang grade > 0; blue), and 35% required a hearing aid (Chang grade ≥ 2a; red). Cisplatin-related hearing loss assessment was based on audiology data between 9 and 24 months from the initiation of therapy. The audiology examination closest to 24 months and the worse grade for the two ears were used to determine ototoxicity status. The red arrow indicates the initiation of cisplatin therapy.
Supplementary Figure 4 SNP quality control and filtering in the discovery GWAS.
SNPs were filtered on the basis of allele frequency and call rate (Online Methods).
Supplementary Figure 5 Association results of SNPs around the top GWAS signal at the ACYP2 locus in the discovery GWAS.
Regional plots showed association at SNPs within a 300-kb window (chr. 2: 54.25–54.55 Mb) at the ACYP2 locus. The plots were constructed using LocusZoom (Bioinformatics 26, 2336–2337, 2010): P values (–log10 P values; y axis) are plotted against the respective chromosomal position of each SNP (x axis), and colors indicate LD (r2) with the top signal in 1000 Genomes Project European populations.
Supplementary Figure 6 Associations of ACYP2 SNP (rs1872328) genotype with cisplatin-induced ototoxicity, stratifying on ancestry, craniospinal irradiation and treatment protocols.
Risk allele frequency at rs1872328 is plotted for patients with different degrees of ototoxicity including patients from all ancestry groups (a) and genetically defined European Americans only (b). (c,d) The risk allele (A allele) frequency of rs1872328 increased in parallel with the severity of hearing loss (Chang grades), regardless of craniospinal irradiation dose (c) or treatment protocols (d).
Supplementary Figure 7 Flowchart of patients' inclusion/exclusion for the genetic analyses in the replication series (SJYC07).
Patients were included in the replication series on the basis of the availability of germline DNA and audiology assessments.
Supplementary Figure 8 Exonic variants in ACYP2 identified by targeted resequencing.
Variants in exonic regions of ACYP2 were examined by Sanger sequencing in 257 children included in the discovery GWAS and replication cohort. (a) Boxes indicate four exons of ACYP2 including the coding region (red) and UTRs (blue). Triangles, circles and squares denote UTR, silent and missense variants, respectively. Each shape represents a patient carrying the variant, with open and filled shapes indicating individuals negative or positive for ototoxicity, respectively. (b) Details for all four exonic variants and the nine patients who carried these variants. *“N” indicates novel variants not present in dbSNP.
Supplementary Figure 9 ACYP2 expression and cisplatin treatment response.
ACYP2 expression levels (retrieved from GSE11582 in the NCBI GEO database) are positively related to cisplatin IC50 (Am. J. Hum. Genet. 81, 427–437, 2007) in HapMap CEU lymphoblastoid cell lines.
Supplementary Figure 10 Acyp2 expression in mouse hair cells.
Expression of Acyp2 was determined by RNA-seq of utricle and cochlea hair cells at four different time points (embryonic day 16 and postnatal days 0, 4, and 7; SHIELD database, https://shield.hms.harvard.edu/; J. Neurosci. 34, 11085–11095, 2014).
Supplementary Figure 11 Genetic ancestry distribution in the discovery GWAS cohort.
Genetic ancestry was assessed by principal-component analysis of genome-wide SNP genotype. The top two principal components are shown, and colors discriminate different self-reported ancestry groups.
Supplementary Figure 12 Quantile-quantile (Q-Q) plot of the discovery GWAS results.
The negative logarithm of the observed (y axis) and the expected (x axis) P value is plotted for each SNP (dot), and the black line indicates the null hypothesis of no true association. Deviation from the expected P-value distribution is evident only in the tail area (λ = 1.04), suggesting that population stratification was adequately controlled.
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Supplementary Figures 1–12, Supplementary Note and Supplementary Tables 1–5. (PDF 3557 kb)
Supplementary Data
Data used to generate the Manhattan plot shown in Figure 1a. (ZIP 14728 kb)
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Xu, H., Robinson, G., Huang, J. et al. Common variants in ACYP2 influence susceptibility to cisplatin-induced hearing loss. Nat Genet 47, 263–266 (2015). https://doi.org/10.1038/ng.3217
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DOI: https://doi.org/10.1038/ng.3217
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