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Molecular epidemiological study of animal rabies in Kazakhstan
Gulzhan N. YESSEMBEKOVA, XIAO Shuang, Assem ABENOV, Talgat KARIBAEV, Alexandr SHEVTSOV, Amirgazin ASYLULAN, Yersyn Y. MUKHANBETKALIYEV, SHUAI Lei, BU Zhi-gao, Sarsenbay K. ABDRAKHMANOV
2023, 22 (4): 1266-1275.   DOI: 10.1016/j.jia.2022.11.011
Abstract174)      PDF in ScienceDirect      

Rabies is a serious public health issue in Kazakhstan, with high economic impact and social burden.  As part of a routine surveillance, 31 rabies-positive brain specimens taken from livestock (cattle) and carnivores (dogs, foxes, and cats) during 2013–2021 were subject to viral sequencing.  Phylogenetic and Bayesian analysis were performed using obtained rabies virus (RABV) sequences.  All 31 strains of RABV candidate belonged to the Cosmopolitan clade, of which 30 strains belonged to steppe-type subclade, and 1 dog strain belonged to Other subclade.  The 31 strains did not diverge from RABV strains in Kazakhstan and neighboring countries, including Russia, Mongolia, and China, suggesting that animal rabies has close relationship and transmission between borders.  Fox-originated strains and cattle strains shared similar sequence signature, and some animal rabies cases had space–time intersection, showing that infected foxes were a major transmission source of cattle rabies in different Kazakhstan regions.  Besides, free-roaming dogs played a pivotal role in rabies epizootics of cattle in Kazakhstan.  The recent spread of animal rabies presents an increasing threat to public health, and provides updated information for improving current control and prevention strategies at the source for Kazakhstan and neighboring countries.

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Generation of recombinant rabies virus ERA strain applied to virus tracking in cell infection
ZHAO Dan-dan, SHUAI Lei, GE Jin-ying, WANG Jin-liang, WEN Zhi-yuan, LIU Ren-qiang, WANG Chong, WANG Xi-jun, BU Zhi-gao
2019, 18 (10): 2361-2368.   DOI: 10.1016/S2095-3119(19)62717-6
Abstract157)      PDF in ScienceDirect      
The mechanism of rabies virus (RABV) infection still needs to be further characterized.  RABV particle with self-fluorescent is a powerful viral model to visualize the viral infection process in cells.  Herein, based on a reverse genetic system of the Evelyn-Rokitnicki-Abelseth (rERA) strain, we generated a recombinant RABV rERA-N/mCherry strain that stably expresses an additional ERA nucleoprotein that fuses with the red fluorescent protein mCherry (N/mCherry).  The rERA-N/mCherry strain retained growth property similar to the parent strain rERA in vitro.  The N/mCherry expression showed genetic stability during passage into mouse neuroblastoma (NA) cells and did not change the virulence of the vector.  The rERA-N/mCherry strain was then utilized as a visual viral model to study the RABV-cell binding and internalization.  We directly observed the red self-fluorescence of rERA-N/mCherry particles binding to the cell surface, and further co-localizing with clathrin in the early stage of infection in NA cells by fluorescence microscopy.  Our results showed that the rERA-N/mCherry strain uses clathrin-dependent endocytosis to enter cells, which is consistent with the well-known mechanism of RABV invasion.  The recombinant RABV rERA-N/mCherry thus appears to have the potential to be an effective viral model to further explore the fundamental molecular mechanism of rabies neuropathogenesis.
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