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V3 区种群序列测定确定的基因型假阳性率可预测焦磷酸测序检测到的 HIV-1 CXCR4 利用病毒载量。

The genotypic false positive rate determined by V3 population sequencing can predict the burden of HIV-1 CXCR4-using species detected by pyrosequencing.

机构信息

Department of Experimental Medicine and Surgery, University of Tor Vergata Rome, Italy.

出版信息

PLoS One. 2013;8(1):e53603. doi: 10.1371/journal.pone.0053603. Epub 2013 Jan 14.

Abstract

OBJECTIVE

The false-positive rate (FPR) is a percentage-score provided by Geno2Pheno-algorithm indicating the likelihood that a V3-sequence is falsely predicted as CXCR4-using. We evaluated the correlation between FPR obtained by V3 population-sequencing and the burden of CXCR4-using variants detected by V3 ultra-deep sequencing (UDPS) and Enhanced-Sensitivity Trofile assay (ESTA).

METHODS

54 HIV-1 B-subtype infected-patients (all maraviroc-naïve), with viremia >10,000copies/ml, were analyzed. HIV-tropism was assessed by V3 population-sequencing, UDPS (considering variants with >0.5% prevalence), and ESTA.

RESULTS

By UDPS, CCR5-using variants were detected in 53/54 patients, irrespective of FPR values, and their intra-patient prevalence progressively increased by increasing the FPR obtained by V3 population-sequencing (rho = 0.75, p = 5.0e-8). Conversely, the intra-patient prevalence of CXCR4-using variants in the 54 patients analyzed progressively decreased by increasing the FPR (rho = -0.61; p = 9.3e-6). Indeed, no CXCR4-using variants were detected in 13/13 patients with FPR>60. They were present in 7/18 (38.8%) patients with FPR 20-60 (intra-patient prevalence range: 2.1%-18.4%), in 5/7 (71.4%) with FPR 10-20, in 4/6 (66.7%) with FPR 5-10, and in 10/10(100%) with FPR<5 (intra-patient prevalence range: 12.1%-98.1%).

CONCLUSIONS

FPR by V3 population-sequencing can predict the burden of CXCR4-using variants. This information can be used to optimize the management of tropism determination in clinical practice. Due to its low cost and short turnaround time, V3 population-sequencing may represent the most feasible test for HIV-1 tropism determination. More sensitive methodologies (as UDPS) might be useful when V3 population-sequencing provides a FPR >20 (particularly in the range 20-60), allowing a more careful identification of patients harboring CXCR4-using variants.

摘要

目的

假阳性率(FPR)是由 Geno2Pheno 算法提供的百分比评分,用于指示 V3 序列被错误预测为 CXCR4 使用的可能性。我们评估了通过 V3 群体测序获得的 FPR 与通过 V3 超深度测序(UDPS)和增强敏感性 Trofile 分析(ESTA)检测到的 CXCR4 使用变体的负担之间的相关性。

方法

对 54 名 HIV-1 B 亚型感染患者(均未接受马拉维若治疗,病毒载量>10,000copies/ml)进行分析。通过 V3 群体测序、UDPS(考虑流行率>0.5%的变体)和 ESTA 评估 HIV 嗜性。

结果

通过 UDPS,在 54 名患者中均检测到 CCR5 使用变体,无论 FPR 值如何,其患者内流行率均随 V3 群体测序获得的 FPR 增加而逐渐增加(rho=0.75,p=5.0e-8)。相反,在分析的 54 名患者中,CXCR4 使用变体的患者内流行率随 FPR 增加而逐渐降低(rho=-0.61;p=9.3e-6)。实际上,在 FPR>60 的 13 名患者中未检测到 CXCR4 使用变体。在 FPR 为 20-60 的 18 名患者中(患者内流行率范围:2.1%-18.4%)存在 7 例(38.8%),在 FPR 为 10-20 的 7 名患者中存在 5 例(71.4%),在 FPR 为 5-10 的 6 名患者中存在 4 例(66.7%),在 FPR<5 的 10 名患者中存在 10 例(100%)(患者内流行率范围:12.1%-98.1%)。

结论

V3 群体测序的 FPR 可预测 CXCR4 使用变体的负担。该信息可用于优化临床实践中对嗜性确定的管理。由于成本低且周转时间短,V3 群体测序可能是 HIV-1 嗜性测定最可行的检测方法。当 V3 群体测序提供的 FPR>20 时(尤其是在 20-60 的范围内),更敏感的方法(如 UDPS)可能会更有用,这允许更仔细地识别携带 CXCR4 使用变体的患者。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/eb06/3544916/d484d2e56062/pone.0053603.g001.jpg

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