期刊
VIRUS RESEARCH
卷 150, 期 1-2, 页码 61-72出版社
ELSEVIER
DOI: 10.1016/j.virusres.2010.02.015
关键词
Avian paramyxovirus; APMV-6; Strain Italy; Genome sequence
类别
资金
- NIAID [N01A060009]
- NIAID, NIH
- NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES [ZIAAI000938] Funding Source: NIH RePORTER
Complete genome sequences were determined for two strains of avian paramyxovirus serotype 6 (APMV-6): the prototype Hong Kong (HK) strain and a more recent isolate from Italy (IT4524-2). The genome length of strain HK is 16236 nucleotide (nt), which is the same as for the other two APMV-6 strains (FE and 7W) that have been reported to date, whereas that of strain IT4524-2 is 16230 nt. The length difference in strain IT4524-2 is due to a 6-nt deletion in the downstream untranslated region of the F gene. All of these viruses follow the rule of six. Each genome consists of seven genes in the order of 3'N-P-M-F-SH-HN-L5', which differs from other APMV serotypes in containing an additional gene encoding the small hydrophobic (SH) protein. Sequence comparisons revealed that strain IT4524-2 shares an unexpectedly low level of genome nt sequence identity (70%) and aggregate predicted amino acid (aa) sequence identity (79%) with other three strains, which in contrast are more closely related to each other with nt sequence 94-98% nt identity and 90-100% aggregate aa identity. Sequence analysis of the F-SH-HN genome region of two other recent Italian isolates showed that they fall in the HK/FE/TW group. The predicted signal peptide of IT4524-2 F protein lacks the N-terminal first 10 aa that are present in the other five strains. Also, the F protein cleavage site of strain IT4524-2, (R) under bar EP (R) under bar down arrow L, has two dibasic aa (arginine, R) compared to the monobasic F protein cleavage site of PEP (R) under bar down arrow L. in the other strains. Reciprocal cross-hemagglutination inhibition (HI) assays using post-infection chicken sera indicated that strain IT4524-2 is antigenically related to the other APMV-6 strains, but with 4- to 8-fold lower HI tiers for the test sera between strain IT4524-2 and the other APMV-6 strains. Taken together, our results indicated that the APMV-6 strains represents a single serotype with two subgroups that differ substantially based on nt and aa sequences and can be distinguished by HI assay. (C) 2010 Elsevier B.V. All rights reserved.
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