Callahan R, Lieber M M, Todaro G J
J Virol. 1975 Jun;15(6):1378-84. doi: 10.1128/JVI.15.6.1378-1384.1975.
Two major subclasses of xenotropic (X-tropic) murine type C viruses can be distinguished by nucleic acid hybridization. The most frequently encountered subclass (MuLV-X-alpha) includes isolates from BALB/c, C57BL/6J, C58/J, AKR/J, CBA/J, and DBA/2J inbred strains and from the Asian feral mouse subspecies Mus musculus molossinus. The other subclass (MuLV-X-beta) consists of viruses isolated from the NIH Swiss and NZB/BINJ strains. Thus, significant polymorphism exists among the endogenous type C virogenes of a single species, Mus musculus. MuLV-X-alpha genes are found in strains that also have endogenous mouse-tropic viruses (either N-tropic, B-tropic, or both), whereas the MuLV-X-beta subclass is restricted to mouse strains from which mouse-tropic viruses have not yet been isolated. The results are consistent with a model which proposes that mouse-tropic endogenous viruses are derived from the MuLV-X-alpha subclass.
嗜异性(X嗜性)鼠C型病毒的两个主要亚类可通过核酸杂交加以区分。最常遇到的亚类(MuLV-X-α)包括来自BALB/c、C57BL/6J、C58/J、AKR/J、CBA/J和DBA/2J近交系以及亚洲野生小鼠亚种小家鼠的分离株。另一个亚类(MuLV-X-β)由从NIH瑞士小鼠和NZB/BINJ品系分离出的病毒组成。因此,在单一物种小家鼠的内源性C型病毒基因之间存在显著的多态性。MuLV-X-α基因存在于也具有内源性嗜小鼠病毒(N嗜性、B嗜性或两者兼具)的品系中,而MuLV-X-β亚类则局限于尚未分离出嗜小鼠病毒的小鼠品系。这些结果与一个模型相符,该模型提出嗜小鼠内源性病毒源自MuLV-X-α亚类。