Characterization of tissue culture-induced heterogeneity in DNAs of independent isolates of JC virus.

Characterization of tissue culture-induced heterogeneity in DNAs of independent isolates of JC virus.
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组织培养诱导的 JC 病毒独立分离株 DNA 异质性的表征。

DOI:
10.1099/0022-1317-64-10-2271
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发表时间:
1983
期刊:
The Journal of general virology
影响因子:
--
通讯作者:
Walker,DL
Walker,DL
中科院分区:
--
文献类型:
--
作者:
Martin,JD;Padgett,BL;Walker,DL

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在 37°C 下以低复数感染原代人胎儿神经胶质细胞中进行数次连续传代后,原型 (MAD-1) JC 病毒的 DNA 以及 MAD-2 和 MAD-3 的 DNA 在大小上通常是异质的,但 MAD-4 和 MAD-6 的 DNA 相对均质。在最近在 39°C 的神经胶质培养物中、在低感染复数的体外短暂传代的相似条件下,在 6 个分离株的 DNA 中观察到类似的二分性:两个分离株(MAD-9 和 -10)的 DNA 是异质的,但其他四个分离株(MAD-8、-11、-12 和 -14)的 DNA 是同质的。因此,病毒基因组持续缺失的倾向是每个分离株的固有特性。然而,可能有缺陷的DNA的实际诱导和维持受到神经胶质培养物中允许的成神经细胞和半允许的星形胶质细胞的相对比例以及感染的多重性的影响。 MAD-1 DNA 中的缺失仅限于假定的早期区域并跨越 BamHI 切割位点(图谱位置 0.505)。 MAD-2 和 MAD-3 的 DNA 中的异质性更为复杂,但大多数缺失(高达全长 DNA 的 12%)跨越了 BamHI 位点。我们认为分离株之间对缺失的不同易感性是 JC 病毒自然遗传变异的结果。
After several serial passages at low multiplicities of infection in primary human foetal glial cells at 37 °C, the DNA of prototype (MAD-1) JC virus and that of MAD-2 and MAD-3 are typically heterogeneous in size, but DNAs of MAD-4 and MAD-6 are relatively homogeneous. A similar dichotomy was observed in the DNAs of six isolates propagated more recently in glial cultures at 39 °C under similar conditions of brief passagein vitroat low multiplicities of infection: the DNAs of two (MAD-9 and -10) were heterogeneous, but the DNAs of four others (MAD-8, -11, -12 and -14) were homogeneous. Therefore, the propensity of the viral genome to sustain deletions was an intrinsic property of each isolate. However, actual induction and maintenance of the presumably defective DNAs was influenced by the relative proportions of permissive spongioblasts and semi-permissive astrocytes in the glial cultures and by the multiplicity of infection. Deletions in MAD-1 DNA were confined to the presumptive early region and spanned theBamHI cleavage site (map position 0.505). The heterogeneity was more complex in the DNAs of MAD-2 and MAD-3, but again most of the deletions, which ranged up to 12% of full-length DNA, spanned theBamHI site. We propose that the differential susceptibility to deletion among isolates is a consequence of natural genetic variation in JC virus.
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