dc.contributor.author | Hasegawa, I | |
dc.contributor.author | Tanaka, Y | |
dc.contributor.author | Kramvis, A | |
dc.contributor.author | Kato, T | |
dc.contributor.author | Sugauchi, F | |
dc.contributor.author | Acharya, KS | |
dc.contributor.author | Orito, E | |
dc.contributor.author | Ueda, R | |
dc.contributor.author | Kew, MC | |
dc.contributor.author | Mizokami, M | |
dc.date.accessioned | 2013-07-03T15:02:29Z | |
dc.date.available | 2013-07-03T15:02:29Z | |
dc.date.issued | 2004 | |
dc.identifier.citation | KIRTDA, DRACHARYAS. 2004. Hasegawa I, Tanaka Y, Kramvis A, Kato T, Sugauchi F, Acharya SK, Orito E, Ueda R, Kew MC, Mizokami M.Novel hepatitis B virus genotype a subtyping assay that distinguishes subtype Aa from Ae and its application in epidemiological studies.J Virol. 2004 Jul | en |
dc.identifier.uri | http://profiles.uonbi.ac.ke/sacharya/publications/hasegawa-i-tanaka-y-kramvis-kato-t-sugauchi-f-acharya-sk-orito-e-ueda-r-kew-mc | |
dc.identifier.uri | http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/44877 | |
dc.description.abstract | The eight genotypes of hepatitis B virus (HBV) have different geographical distributions, virological characteristics, and clinical manifestations. A unique subtype of HBV genotype A (HBV/A) was reported in sub-Saharan Africa, raising the possibility that patients infected with this subtype (HBV/Aa ["a" for African and Asian]) may have different clinical outcomes than other HBV/A isolates (HBV/Ae ["e" for European]). Comparison between 30 HBV/Aa and 30 HBV/Ae isolates indicated that almost all HBV/Ae isolates had G at nucleotide (nt) 1809 and C at nt 1812, whereas HBV/Aa isolates had T1809/T1812. Taking advantage of these two single nucleotide polymorphisms (SNPs), a novel subtype-specific PCR assay in the X/precore/core region was developed. This assay was combined with a restriction fragment length polymorphism assay using BglII in a different region (nt 1984 to 1989), which has a SNP distinguishing HBV/Aa from HBV/Ae, resulting in 100% specificity for the combined assay. Application of the subtyping assay using sera from 109 paid donors in the United States indicated significantly different distributions of HBV/A subtypes among races; African-Americans, Caucasians, and Hispanics had HBV/Ae, whereas Asians had mainly HBV/Aa, suggesting that the HBV/Aa isolates may have been imported by recent immigration from Asia. In conclusion, the specificity and sensitivity of the combined subtyping assay were confirmed, and its usefulness was demonstrated in a practical context. | en |
dc.language.iso | en | en |
dc.title | Novel hepatitis B virus genotype a subtyping assay that distinguishes subtype Aa from Ae and its application in epidemiological studies | en |
dc.type | Article | en |
local.publisher | Department of Medicine, College of Health Sciences, University of Nairobi | en |