Natural infection of a homozygous delta24 CCR5 red-capped mangabey with an R2b-tropic simian immunodeficiency virus.

Natural infection of a homozygous delta24 CCR5 red-capped mangabey with an R2b-tropic simian immunodeficiency virus.
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DOI:
10.1084/jem.188.11.2057
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发表时间:
1998-12-07
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Marx PA
Marx PA
中科院分区:
其他
文献类型:
--
作者:
Chen Z;Kwon D;Jin Z;Monard S;Telfer P;Jones MS;Lu CY;Aguilar RF;Ho DD;Marx PA

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在非洲和美国动物园的 15 只红顶白眉猴 (RCM)(Cercocebus torquatus torquatus)中,有 11 只的 CC 趋化因子受体 5 (CCR5) 中发现纯合 24 bp 缺失 (Δ24)。 CCR5 Δ24 缺陷在第四跨膜区的读框内包含 8 个氨基酸。出乎意料的是,11个纯合子(Δ24CCR5/Δ24CCR5)之一的RCM-009被发现自然感染了不同的猿猴免疫缺陷病毒(SIV)毒株,该毒株不是R5亲性的,而是使用CCR2b(R2b)作为其主要辅助受体。 SIVrcmGab1 是测试的其他不同 SIV 中唯一的 R2b 向性 SIV。转染 Δ24 CCR5 的细胞不支持 R5 向性 SIVmac、SIVcpz、SIVmne、HIV-2 或 HIV-1 的进入,并且在 β-趋化因子介导的信号转导中也不活跃。 Δ24 等位基因频率为 86.6%,显着高于人类中发现的 32 bp 缺失频率。 34 只乌白眉猴 (SM) 中的 Δ24 频率为 4.1%,这是一种地理上孤立的亚种,自然感染 R5 热带 SIV。在相隔 10,000 年或更长时间的两个白眉猴亚种中发现相同的缺失,可以确定 Δ24 CCR5 缺失是古老的。然而,RCM 中 CCR5 高缺失率的选择压力来源仍有待确定。与 SM 相比,RCM 中 Δ24 CCR5 的等位基因频率较高,表明 SIVrcm 可能获得了 R2b 向性,因为其宿主出现了对 CCR5 遗传缺陷的适应。
A homozygous 24-bp deletion (Δ24) was found in the CC chemokine receptor 5 (CCR5) of 11 out of 15 red-capped mangabeys (RCMs), Cercocebus torquatus torquatus, both in Africa and in an American zoo. The CCR5 Δ24 defect encompassed eight amino acids in frame in the fourth transmembrane region. Unexpectedly, RCM-009, one of 11 homozygotes (Δ24CCR5/ Δ24CCR5), was found to be naturally infected with a divergent simian immunodeficiency virus (SIV) strain, which was not R5-tropic, but used CCR2b (R2b) as its major coreceptor. SIVrcmGab1 was the only R2b-tropic SIV among other divergent SIVs tested. Cells transfected with the Δ24 CCR5 did not support entry of R5-tropic SIVmac, SIVcpz, SIVmne, HIV-2, or HIV-1, and were also inactive in signal transduction mediated by β-chemokines. At 86.6%, the Δ24 allelic frequency was significantly higher than that of the 32-bp deletion found in humans. The Δ24 frequency was 4.1% in 34 sooty mangabeys (SMs), a geographically isolated subspecies that was naturally infected with R5-tropic SIV. Finding identical deletions in two mangabey subspecies separated for 10,000 years or more dates the Δ24 CCR5 deletion as ancient. However, the source of the selective pressure for the high rate of CCR5 deletion in RCMs remains to be determined. The high allelic frequency of the Δ24 CCR5 in RCMs, in comparison to that of SMs, suggests that R2b-tropism may have been acquired by SIVrcm, as an adaptation to CCR5 genetic defects appeared in its host.
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