S Sahana, A Sivadas, V Scaria conceived the study. S Sahana, M Mangla and A Sivadas performed data curation, bioinformatics and statistical analysis. A Sivadas, M Mangla and V Scaria provided critical feedback on analyzed data. S Sahana and A Sivadas wrote the manuscript. S Sahana, A Sivadas, M Mangla, V Scaria and S Sivasubbu read, edited and confirmed the final version of the manuscript. All the remaining authors contributed in collection, sequencing and analysis of the genome sequence data.