Nucleotide sequence analysis of human T cell leukemia virus, type II (HTLV-II) isolates.

Nucleotide sequence analysis of human T cell leukemia virus, type II (HTLV-II) isolates.
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人 T 细胞白血病病毒 II 型 (HTLV-II) 分离株的核苷酸序列分析。

DOI:
10.1089/aid.1993.9.721
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发表时间:
1993
影响因子:
1.5
通讯作者:
Hall,WW
Hall,WW
中科院分区:
医学4区
文献类型:
--
作者:
Takahashi,H;Zhu,SW;Ijichi,S;Vahlne,A;Suzuki,H;Hall,WW

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Hallet等人的研究(J Virol 1992;66:2456-2463;参考文献11)表明存在两种密切相关的HTLV-II分子亚型,暂时命名为HTLV-Ha和HTLV-IIb。为了证实这一点,对编码10个HTLV-II分离株的整个表面糖蛋白gp 46和跨膜糖蛋白gp 21的氨基末端的986 bp的env基因区进行了核苷酸序列分析。结果清楚地确定了两种亚型的存在,并证明了该区域序列的4.3%差异。前病毒的其他基因区域,包括thepol(1544 bp),gag(448 bp),和整个LTR(743 bp)的两个代表性分离株的每个亚型的分析,显示出3.8至5.7%的序列分歧,最大的分歧发生在LTR。除了单核苷酸的变化外,还发现HTLV-IIb分离株编码结构蛋白p19的gag区有一个66 bp的缺失,这将导致p19蛋白在羧基末端区域有22个氨基酸的缺失。尝试利用这一点在血清学上区分两种亚型是不成功的,因为发现两种亚型的重组pl 9蛋白是抗原性交叉反应性的。HTLV-II的两种分子亚型的发现可能对更好地了解该病毒的生物学和致病特性具有重要意义,并将有助于描述美洲印第安人流行性疾病中存在的病毒。
A study by Hallet al. (J Virol 1992;66:2456-2463; Ref. 11) has suggested the existence of two closely related molecular subtypes of HTLV-II, which were tentatively designated HTLV-Ha and HTLV-IIb. To confirm this nucleotide sequence analysis of 986 bp of the env gene region encoding the entire surface glycoprotein, gp46, and the amino terminus of the transmembrane glycoprotein, gp21, of 10 HTLV-II isolates was carried out. The results clearly established the existence of two subtypes and demonstrated a 4.3% divergence in sequence in this region. Analysis of other gene regions of the provirus, including thepol(1544 bp),gag(448 bp), and the entire LTR (743 bp) of two representative isolates of each subtype, showed a sequence divergence of 3.8 to 5.7%, with greatest divergence occurring in the LTR. In addition to single nucleotide changes, thegagregions encoding the structural protein, pl9, of the HTLV-IIb isolates were also found to have a 66-bp deletion that would be expected to result in a p19 protein having a 22-amino acid deletion in the carboxy-terminus region. Attempts to exploit this to differentiate the two subtypes serologically were unsuccessful in that recombinant pl9 proteins of both subtypes were found to be antigenically cross-reactive. The finding of two molecular subtypes of HTLV-II may have important implications for a better understanding of the biological and pathogenic properties of the virus, and will be useful in characterizing the viruses present in endemic foci in American Indian populations.
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发表时间: 1991
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影响因子: 11.1
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DOI: --
发表时间: 1988
影响因子: 3.8
作者:
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