Genomic sequence of hepatitis A virus L-A-1 vaccine strain / 中华实验和临床病毒学杂志
Chinese Journal of Experimental and Clinical Virology
; (6): 360-362, 2004.
Article
en Zh
| WPRIM
| ID: wpr-333095
Biblioteca responsable:
WPRO
ABSTRACT
<p><b>OBJECTIVE</b>To study the genome sequence of hepatitis A virus L-A-1 strain which has been applied for live attenuated vaccine production in China, to compare with other HAV strains, to understand some characteristics of L-A-1 strain, and to find the mechanism of attenuation and cell adaptation.</p><p><b>METHODS</b>Genome fragments were prepared by antigen-capture PCR from infected cell (2BS), PCR products were cloned into T vector, sequenced and analyzed by using bioinformatics program.</p><p><b>RESULTS</b>Analysis of the genomic sequences(nt 25-7,418) showed that the open reading frame contains 6,675 nucleotides in length encoding 2,225 amino acids. Sequence homology comparison showed 98.00% and 94.00% homology at nucleotide level, and 98.51% and 98.65% homology at amino acid level with international strains MBB and HM 175, respectively. Through comparison with other attenuated, cell adapted and cytopathic effect (CPE) strains, L-A-1 strain had mutation at nt 152, 591, 646, 687 and insertion at nt 180-181 in 5?NTR and had mutation at nt 3,889 (aa 1 052-Val) in 2B region, these mutations and insertion are molecular basis for cell adaptation; mutation at nt 4,185 (aa 1 152-Lys) in 2C region should be attenuated marker; deletion in 3A region (nt 5,020-5,025) that caused two amino acids deletion is virus fast growth basis.</p><p><b>CONCLUSION</b>Through analyzing L-A-1 strain genomic sequence, certain sites related to cell adaptation and attenuation were found.</p>
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Asunto principal:
Adaptación Biológica
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Vacunas Atenuadas
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Secuencia de Bases
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Sistemas de Lectura Abierta
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Secuencia de Aminoácidos
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Genoma Viral
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Homología de Secuencia
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Eliminación de Gen
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Vacunas contra la Hepatitis A
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Virus de la Hepatitis A
Idioma:
Zh
Revista:
Chinese Journal of Experimental and Clinical Virology
Año:
2004
Tipo del documento:
Article