Genetic diversity and characterization of circular replication(Rep)-encoding single-stranded (CRESS) DNA viruses

Abstract

The CRESS-DNA viruses are the ubiquitous virus detected in almost all eukaryotic life trees and play an essential role in the maintaining ecosystem of the globe. Still, their genetic diversity is not fully understood. Here we bring to light the genetic diversity of Replication (Rep) and Capsid (Cap) proteins of CRESS-DNA viruses. We divided the Rep protein of the CRESS-DNA virus into ten clusters using CLANS and phylogenetic analyzes. Also, most of the Rep protein in Rep cluster 1 (R1) and R2 (Circoviridae, Smacoviridae, Nanoviridae, and CRESSV1-5) contain the Viral_Rep superfamily and P-loop_NTPase superfamily domains, while the Rep protein of viruses in other clusters has no such characterized functional domain. The Circoviridae, Nanoviridae, and CRESSV1-3 viruses contain two domains, such as Viral_Rep and P-loop_NTPase; the CRESSV4 and CRESSV5 viruses have only the Viral_Rep domain, and most of the sequences in the pCRESS-related group have only P-loop_NTPase, and Smacoviridae do not have these two domains. Further, we divided the Cap protein of the CRESS-DNA virus into 20 clusters using CLANS and phylogenetic analyzes. The Rep and Cap proteins of Circoviridae and Smacoviridae are grouped into a specific cluster. Cap protein of CRESS-DNA viruses grouped with one cluster and Rep protein with another cluster. Further, our study reveals that selection pressure plays a significant role in the evolution of CRESS-DNA viruses' Rep and Cap genes rather than mutational pressure. We hope this study will help determine the genetic diversity of CRESS-DNA viruses as more sequences are discovered in the future.

Challenges of the Omicron (B.1.1.529) Variant and Its Lineages: A Global Perspective

“…Several countries have observed these subvariants with strikingly different genetic characteristics. Out of these, BA.2 became dominant in many countries and has rapidly replaced other subvariants may be due to the presence of specific mutation (H78Y) [8] . In this context, Lyngse and co‐workers have estimated the transmission dynamics of BA.1 and BA.2 among 8,541 primary household cases based on the nationwide Danish data [9] .…”