New test offers improved diagnosis and management of chronic hepatitis B

COLD-PCR/FMCA enables simultaneous and more precise evaluation of HBV DNA, genotypes, and mutant DNA, as well as better assessment of infection status, disease progression, and response to treatment, reports The Journal of Molecular Diagnostics


Philadelphia, October 10, 2019

A report in The Journal of Molecular Diagnostics, published by Elsevier, describes a new and powerful laboratory tool that may improve the diagnosis and treatment of hepatitis B virus (HBV) infection. The technique can simultaneously assess several indicators important for optimal patient management.

A team of scientists has developed a highly sensitive coamplification at lower denaturation temperature PCR (COLD-PCR) coupled with probe-based fluorescence melting curve analysis (FMCA) for precision diagnosis of chronic hepatitis B (CHB) patients. This novel tool is simple, stable, convenient, practical, inexpensive, and may be used routinely in the average hospital laboratory.

“Guidelines have confirmed that dynamic monitoring of HBV DNA, genotypes, and reverse transcriptase (RT) mutant DNA is of great importance to assess infection status, predict disease progression, and judge treatment efficacy in HBV-infected patients,” explained lead investigator Qishui Ou, PhD, Department of Laboratory Medicine, The First Affiliated Hospital of Fujian Medical University, the Gene Diagnostic Laboratory, Fujian Medical University, and the Fujian Key Laboratory of Laboratory Medicine, Fuzhou, China. “We believe COLD-PCR/FMCA provides a powerful laboratory tool for precise diagnosis and treatment of HBV-infected patients.”

Although a number of molecular methods have been developed for measuring these parameters, many are limited by poor sensitivity or inability to detect more than one mutation at a time. Others are too cumbersome or expensive for clinical use. “Our goal was to establish a more practical and inexpensive method with high sensitivity to detect genotype and RT mutations while detecting HBV DNA,” noted Dr. Ou.

Moreover, COLD-PCR/FMCA can detect HBV mutations at much lower concentrations than other techniques such as PCR/FMCA or PCR Sanger sequencing (1 percent vs. 10 percent vs. 20 percent, respectively). This new technique can also distinguish different phases of HBV infection according to the proportion and type of mutations as well as by detecting HBV DNA.

The researchers also report that the genotype and mutation detected by COLD-PCR/FMCA may predict whether a patient will respond to antiviral therapy. Analysis of serum samples from 41 patients with CHB who were receiving entecavir revealed that the drug was most effective for patients with genotype B and those with a lower percentage of RT mutations at baseline or week 4.

Illustration of the schematic workflow for coamplification at lower denaturation temperature PCR (COLD-PCR)/fluorescence melting curve analysis (FMCA).
Schematic workflow for coamplification at lower denaturation temperature PCR (COLD-PCR)/fluorescence melting curve analysis (FMCA).
(Credit: The First Affiliated Hospital of Fujian Medical University).

“Until now there have not been high-throughput approaches to detect HBV DNA, genotype, and RT mutations simultaneously. Therefore, it is necessary to establish a more practical and inexpensive method with high sensitivity to detect genotype and RT mutations while detecting HBV DNA. COLD-PCR/FMCA has that potential,” said Dr. Ou.

HBV infection affects the liver. According to the World Health Organization, as of 2015, 257 million individuals were living with and 887,000 died from HBV infection, usually as a result of cirrhosis (loss of liver cells and irreversible scarring of the liver) or liver cancer. In 2016, only about 10.5 percent of individuals infected with HBV were aware of their status, only a fraction of whom were receiving treatment. The virus is typically spread through contact with infected blood or bodily fluids. HBV can be prevented by vaccines that offer almost total protection against HBV infection.

---

Notes for editors
The article is “Establishment of Coamplification at Lower Denaturation Temperature PCR/Fluorescence Melting Curve Analysis for Quantitative Detection of Hepatitis B Virus DNA, Genotype, and Reverse Transcriptase Mutation and Its Application in Diagnosis of Chronic Hepatitis B,” by Can Liu, Jinpiao Lin, Zhen Xun, Jinlan Huang, Er Huang, Tianbin Chen, Yujue He, Ni Lin, Bin Yang, and Qishui Ou (https://doi.org/10.1016/j.jmoldx.2019.08.001). It will appear in The Journal of Molecular Diagnostics, volume 21, issue 6 (November 2019) published by Elsevier.

Full text of this study is available to credentialed journalists upon request; contact Eileen Leahy at +1 732 238 3628 or jmdmedia@elsevier.com. Journalists wishing to interview the authors should contact Qishui Ou at +86 591 87981977 or ouqishui@mail.fjmu.edu.cn.

About The Journal of Molecular Diagnostics
The Journal of Molecular Diagnostics
, the official publication of the Association for Molecular Pathology, co-owned by the American Society for Investigative Pathology, and published by Elsevier, seeks to publish high quality original papers on scientific advances in the translation and validation of molecular discoveries in medicine into the clinical diagnostic setting, and the description and application of technological advances in the field of molecular diagnostic medicine. The editors welcome review articles that contain: novel discoveries or clinicopathologic correlations, including studies in oncology, infectious diseases, inherited diseases, predisposition to disease, or the description of polymorphisms linked to disease states or normal variations; the application of diagnostic methodologies in clinical trials; or the development of new or improved molecular methods for diagnosis or monitoring of disease or disease predisposition. jmd.amjpathol.org

About Elsevier
Elsevier is a global information analytics business that helps scientists and clinicians to find new answers, reshape human knowledge, and tackle the most urgent human crises. For 140 years, we have partnered with the research world to curate and verify scientific knowledge. Today, we’re committed to bringing that rigor to a new generation of platforms. Elsevier provides digital solutions and tools in the areas of strategic research management, R&D performance, clinical decision support, and professional education; including ScienceDirect, Scopus, SciVal, ClinicalKey and Sherpath. Elsevier publishes over 2,500 digitized journals, including The Lancet and Cell, 39,000 e-book titles and many iconic reference works, including Gray's Anatomy. Elsevier is part of RELX, a global provider of information-based analytics and decision tools for professional and business customers. www.elsevier.com

Media contacts
Eileen Leahy
Elsevier
+1 732 238 3628
jmdmedia@elsevier.com

Chhavi Chauhan, PhD, Director of Scientific Outreach
The Journal of Molecular Diagnostics
+1 240 283 9724
cchauhan@asip.org