Abstract
The monkeypox virus (Mpoxv) Clade IIb viruses that caused an outbreak in 2017-18 in Nigeria and its genetically related viruses have been detected in many countries and caused multi-country outbreak in 2022. Since the pandemic-causing Mpoxv Clade IIb viruses are closely related to Clade IIa viruses which mostly cause endemic, the Clade IIb Mpoxv might have certain specific genetic variations that are still largely unknown. Here, we have systematically analyzed genetic alterations in different clades of Mpox viruses. The results suggest that the Mpoxv Clade IIb have genetic variations in terms of genomic gaps, frameshift mutations, in-frame nonsense mutations, amino acid tandem repeats, and APOBEC3 mutations. Further, we observed specific genetic variations in the multiple genes specific for Clade I and Clade IIb, and exclusive genetic variations for Clade IIa and Clade IIb. Collectively, findings shed light on the evolution and genetic variations in the outbreak of 2022 causing Mpoxv Clade IIb.
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