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. 1994 Jan;68(1):148–157. doi: 10.1128/jvi.68.1.148-157.1994

Attenuated hepatitis A virus: genetic determinants of adaptation to growth in MRC-5 cells.

A W Funkhouser 1, R H Purcell 1, E D'Hondt 1, S U Emerson 1
PMCID: PMC236273  PMID: 8254724

Abstract

A live candidate hepatitis A virus vaccine, developed from the HM-175 strain and adapted to growth in primary African green monkey kidney (AGMK) cells, was adapted to growth in MRC-5 cells. The nucleotide sequence of the MRC-5 cell-adapted virus was determined and compared with the known sequence of the AGMK cell-adapted virus. Thirteen unique mutations, which occurred during passage in MRC-5 cells, were identified. Four of the unique mutations were located in a cluster in the 5' noncoding region (NC), and three of the remaining nine mutations encoded amino acid changes. Infectious chimeric cDNAs were constructed from infectious cDNA clones of the AGMK cell-adapted and wild-type HM-175 viruses and PCR-amplified cDNA segments of the MRC-5 cell-adapted virus. The viruses encoded by these plasmids were recovered after transfection of cultured cells with in vitro transcripts, and their growth phenotypes in fetal rhesus kidney 4 (FRhK-4) and MRC-5 cells were determined. The important growth-enhancing mutations could be divided into three sets. Two of these were located in the 5' NC region, and the third was located in the 2C nonstructural gene. The mutations in the 5' NC region that developed during passage in MRC-5 cells were indispensable for efficient growth in MRC-5 cells, but a combination of the two groups in the 5' NC region and one in the 2C gene were required to increase growth dramatically in MRC-5 cells.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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