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Typing of human enterovirus by partial sequencing of VP2.

Abstract：

:The sequencing of the VP1 hypervariable region of the human enterovirus (HEV) genome has become the reference test for typing field isolates. This study describes a new strategy for typing HEV at the serotype level that uses a reverse transcription-PCR assay targeting the central part of the VP2 capsid protein. Two pairs of primers were used to amplify a fragment of 584 bp (with reference to the PV-1 sequence) or a part of it (368 bp) for typing. For a few strains not amplified by the first PCR, seminested primers enhanced the sensitivity (which was found to be approximately 10(-1) and 10(-4) 50% tissue culture infective dose per reaction tube for the first and seminested assay, respectively). The typing method was then applied to 116 clinical and environmental strains of HEV. Sixty-one typeable isolates were correctly identified at the serotype level by comparison to seroneutralization. Forty-eight of 55 "untypeable" strains (87.3%) exhibited the same serotype using VP1 and VP2 sequencing methods. For six strains (four identified as EV-71, one as E-9, and one as E-30 by the VP2 method), no amplification was obtained by the VP1 method. The last strain, typed as CV-B4 by VP1 and CV-B3 by VP2 and monovalent antiserum, could exhibit recombination within the capsid region. Although the VP2 method was tested on only 36 of the 68 HEV serotypes, it appears to be a promising strategy for typing HEV strains isolated on a routine basis. The good sensitivity of the seminested technique could avoid cell culture and allow HEV typing directly from PCR products.

journal_name

J Clin Microbiol

journal_title

Journal of clinical microbiology

authors

Nasri D,Bouslama L,Omar S,Saoudin H,Bourlet T,Aouni M,Pozzetto B,Pillet S

doi

10.1128/JCM.00093-07

subject

Has Abstract

pub_date

2007-08-01 00:00:00

pages

2370-9

issue

8

eissn

0095-1137

issn

1098-660X

pii

JCM.00093-07

journal_volume

45

pub_type

杂志文章

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