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Indian Journal of Gastroenterology

, Volume 37, Issue 1, pp 44–49 | Cite as

Acute hepatitis E in India appears to be caused exclusively by genotype 1 hepatitis E virus

  • Neha Gupta
  • Aditya N. Sarangi
  • Sunil Dadhich
  • V. K. Dixit
  • Kamal Chetri
  • Amit Goel
  • Rakesh Aggarwal
Original Article

Abstract

Background

Hepatitis E is caused by infection with hepatitis E virus (HEV), which has four well-known genotypes. Genotypes 1 and 2 HEV have been reported from human cases in areas where the disease is highly endemic. By contrast, genotypes 3 and 4 HEV, which primarily infect several animal species worldwide, have been reported mainly from sporadic human cases in non-endemic areas such as Japan and high-income countries of Europe and North America. To determine whether genotype 3/4 HEV cause sporadic disease in India, a disease-endemic area, we determined HEV genotype in a group of patients with such disease.

Methods

A part of the HEV open reading frame (ORF) 1 was amplified and sequenced from sera of 74 patients with sporadic acute viral hepatitis E from four cities in India. The sequences were compared with prototype sequences for various HEV genotypes and subgenotypes and analyzed using phylogenetic tools to determine the genotype of the isolates. For 12 specimens, a part of HEV ORF2 was also similarly analyzed.

Results

Partial ORF1 sequences of all the 74 isolates belonged to genotype 1 HEV, with 88.2% to 100% nucleotide identity with the prototype genotype 1 isolates. Partial ORF2 sequences for all the 12 isolates also belonged to genotype 1 HEV. On phylogenetic analysis, 71 isolates clustered with prototype genotype 1a HEV; the remaining three isolates were located between subgenotypes 1a and 1c but were closer to the former.

Conclusion

Human sporadic acute hepatitis E in India is caused almost exclusively by genotype 1 HEV.

Keywords

Acute hepatitis Genetic epidemiology Genotype Hepatitis E virus 

Notes

Author contributions

NG: Acquisition of data, analysis, and interpretation of data, drafting the article, final approval of the version to be submitted

ANS: Analysis and interpretation of data, drafting the article, final approval of the version to be submitted

SD: Acquisition of data, drafting the article, final approval of the version to be submitted

VD: Acquisition of data, drafting the article, final approval of the version to be submitted

KC: Acquisition of data, drafting the article, final approval of the version to be submitted

AG: Acquisition of data, revising the draft critically for important intellectual content, final approval of the version to be submitted

RA: The conception and design of the study, acquisition of data, analysis, and interpretation of data, revising the draft critically for important intellectual content, final approval of the version to be submitted

Funding information

This work was supported by a research grant from the Indian Council of Medical Research (ICMR), New Delhi. NG and ANS were supported during this work by the Council of Scientific and Industrial Research (CSIR), New Delhi, and ICMR, respectively. The DNA sequencing facility at the authors’ institution is supported by the Department of Science and Technology, Government of India, New Delhi, under its FIST grant program.

Compliance with ethical standards

Conflict of interest

NG, ANS, SD, VKD, KC, AG, and RA declare that they have no conflict of interest.

Ethics statement

All procedures performed in the studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Copyright information

© Indian Society of Gastroenterology 2018

Authors and Affiliations

  1. 1.Department of GastroenterologySanjay Gandhi Postgraduate Institute of Medical SciencesLucknowIndia
  2. 2.Department of GastroenterologyDr. Sampurnanand Medical CollegeJodhpurIndia
  3. 3.Department of Gastroenterology, Institute of Medical SciencesBanaras Hindu UniversityVaranasiIndia
  4. 4.International HospitalGuwahatiIndia

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