Abstract
CRISPR-Cas is a widespread anti-viral adaptive immune system in the microorganisms. Viruses living in bacteria or some phages carry anti-CRISPR proteins to evade immunity by CRISPR-Cas. The anti-CRISPR proteins are prevalent in phages capable of lying dormant in a CRISPR-carrying host, while their orthologs frequently found in virulent phages. Here, we propose a probabilistic strategy of ancestral sequence reconstruction (ASR) and Hidden Markov Model (HMM) profile search to fish out sequences of anti-CRISPR proteins from environmental metagenomic, human microbiome metagenomic, human microbiome reference genome, and NCBI’s non-redundant databases. Our results revealed that the metagenome database dark matter might contain anti-CRISPR encoding genes.
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Acknowledgements
We would like to thank Dr. Feng-Biao Guo and Dr. Chris M. Brown, who kindly provided us with mirror site of the anti-CRISPR database containing the anti-CRISPR protein sequences.
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SN contributed to conceptualization and methodology; SN, PT, and VT contributed to formal analysis and investigation and writing—original draft of the preparation.
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Nidhi, S., Tripathi, P. & Tripathi, V. Phylogenetic Analysis of Anti-CRISPR and Member Addition in the Families. Mol Biotechnol 65, 273–281 (2023). https://doi.org/10.1007/s12033-022-00558-1
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DOI: https://doi.org/10.1007/s12033-022-00558-1