Comparison of two methods for extracting hepatitis B virus covalently closed circular DNA

HU Kongying, JIN Yutao, YE Jianyu, ZAI Wenjing, WANG Yang, LI Yumeng, CHEN Jieliang

Journal of Microbes and Infections ›› 2021, Vol. 16 ›› Issue (5) : 313-321.

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Journal of Microbes and Infections ›› 2021, Vol. 16 ›› Issue (5) : 313-321. DOI: DOI:10.3969/j.issn.1673-6184.2021.05.004
Original Article

Comparison of two methods for extracting hepatitis B virus covalently closed circular DNA

  • HU Kongying, JIN Yutao, YE Jianyu, ZAI Wenjing, WANG Yang, LI Yumeng, CHEN Jieliang
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Abstract

Hepatitis B virus (HBV) is a hepatotropic DNA virus that can deposit a covalently closed circular DNA form (cccDNA) in the nucleus of infected hepatocytes, which serves as a reservoir for HBV genome and the template for transcribing HBV RNAs. The persistence of cccDNA is the key of HBV chronicity and the main obstacle for HBV cure, and thus cccDNA has always been a focus of HBV research. The efficient extraction of cccDNA from cells is required for accurate detection and quantification. Hirt DNA extraction is a method for isolation of the extrachromosomal DNA in eukaryotes and has been applied for cccDNA extraction. However, the procedure of Hirt DNA extraction is laborious and time-consuming. To simplify the procedure, there has been reports of ”modified Hirt DNA extraction” combined with silicon-based resins column for rapid extraction of extrachromosomal DNA. However, the difference of extraction efficacy between the two methods remains unknown. Here, the two methods were parallelly compared by using Southern Blot and qPCR in various cell culture-based HBV transfection, replication and infection systems. The results suggested that “the modified Hirt-Silica Gel Membrane method” has the potential to enable a fast HBV cccDNA extraction with equally extraction efficacy and specificity compared with “the original Hirt-Phenol/Chloroform method”.

Key words

Hepatitis B virus / cccDNA / Extraction method / Hirt;  / Silica gel membrane

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HU Kongying, JIN Yutao, YE Jianyu, ZAI Wenjing, WANG Yang, LI Yumeng, CHEN Jieliang. Comparison of two methods for extracting hepatitis B virus covalently closed circular DNA[J]. Journal of Microbes and Infections. 2021, 16(5): 313-321 https://doi.org/DOI:10.3969/j.issn.1673-6184.2021.05.004
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