What does this research mean for the field?

Closely related Legionella pneumophila populations within environmental reservoirs undergo fine-scale structural diversification driven by dynamic insertion sequence activity, which occurs independently of core genome single-nucleotide variant variation. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To assess fine-scale genomic diversity and structural variation mediated by insertion sequences among closely related clinical and environmental Legionella pneumophila isolates from a bath-associated outbreak investigation.

August 30, 2026Applied and Environmental MicrobiologyOpen Access

Fine-scale structural diversification among closely related Legionella pneumophila isolates from a bath-associated environmental reservoir

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Authors

NNNaoki NakajimaKanagawa Prefectural Institute of Public Health MJMichio JinnaiNational Institute of Health Sciences AOAya OkamuraKanagawa Prefectural Institute of Public Health

Discussion

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Implication

Genomic analysis reveals dynamic insertion sequence variation in environmental Legionella pneumophila, indicating that mobile elements drive fine-scale diversification beyond nucleotide variants.

Key Points

To assess fine-scale genomic diversity and structural variation mediated by insertion sequences among closely related clinical and environmental Legionella pneumophila isolates from a bath-associated outbreak investigation.
Analyzed 138 Legionella pneumophila serogroup 1 sequence type 138 isolates recovered from a patient and a bath-associated environmental reservoir.
Integrated core genome single-nucleotide variant (cgSNV) profiling with complete genome sequencing and structural analysis across 48 representative isolates.
Clinical isolates formed a clonal lineage, whereas environmental isolates from the bath system exhibited diversity spanning up to 20 cgSNVs despite highly conserved overall synteny.
Insertion sequence insertion profiles, predominantly involving IS256, varied substantially across isolates, even among isolates possessing identical cgSNV genotypes.
Over 50% of the coding sequence differences relative to the reference genome were linked directly to insertion sequence integration events.

Cite This Study

Nakajima et al. (2026) studied this question.

synapsesocial.com/papers/6a93f0696c1a8fb52e79c895 https://doi.org/10.1128/aem.01127-26

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Implication

Genomic analysis reveals dynamic insertion sequence variation in environmental Legionella pneumophila, indicating that mobile elements drive fine-scale diversification beyond nucleotide variants.

Fine-scale structural diversification among closely related Legionella pneumophila isolates from a bath-associated environmental reservoir

Discussion

Member takes

Implication

Key Points

Cite This Study

Fine-scale structural diversification among closely related Legionella pneumophila isolates from a bath-associated environmental reservoir

Discussion

Member takes

Implication

Key Points

Cite This Study

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