Insights Into The Early Diversification of blaNDM-1 Genetic Contexts Following its Emergence in Acinetobacter species and Spread to Enterobacterales

In 13 early blaNDM-1-positive Gram-negative isolates collected in India in 2007, blaNDM-1 was consistently embedded in a conserved multidrug resistance region, with ISAba14 present in 6 sequences.

• Why it matters: Understanding how blaNDM-1 crossed barriers between phylogenetically distant taxa and diversified early is key to explaining its rapid global expansion and persistence.
• What they did: The study sequenced and characterized 13 blaNDM-1-positive isolates from India (2007), assessing clonal diversity in Escherichia coli and Klebsiella pneumoniae and performing comprehensive genomic analysis of blaNDM-1 genetic contexts.
• The result: blaNDM-1 genetic contexts were often linked to mobile genetic elements involved in lateral gene transfer, implying ISAba14 may have contributed to early dissemination across diverse bacterial hosts.