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High throughput ANI analysis of 90K prokaryotic genomes reveals clear species boundaries
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Abstract
A fundamental question in microbiology is whether there is continuum of genetic diversity among genomes, or clear species boundaries prevail instead. Whole-genome similarity metrics such as Average Nucleotide Identity (ANI) help address this question by facilitating high resolution taxonomic analysis of thousands of genomes from diverse phylogenetic lineages. To scale to available genomes and beyond, we present FastANI, a new method to estimate ANI using alignment-free approximate sequence mapping. FastANI is accurate for both finished and draft genomes, and is up to three orders of magnitude faster compared to alignment-based approaches. We leverage FastANI to compute pairwise ANI values among all prokaryotic genomes available in the NCBI database. Our results reveal clear genetic discontinuity, with 99.8% of the total 8 billion genome pairs analyzed conforming to >95% intra-species and <83% inter-species ANI values. This discontinuity is manifested with or without the most frequently sequenced species, and is robust to historic additions in the genome databases.
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“FastANI (v1.3.1) (https://github.com/ParBLiSS/FastANI.) was used to calculate the average nucleotide identity between the isolated strains and the original Lp082,47 ensuring isolates were evolved from Lp082”
From Gut microbiota drives structural variation of exogenous probiotics to enhance colonization (2025) · cites this paper as [47]
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“32 against eight complete S. suis genomes and one complete Streptococcus parasuis genome to confirm the species classification of the isolates (Table S1) [34].”
Minmers are a generalization of minimizers that enable unbiased local Jaccard estimation
Kille, B. L., Garrison, E. P., Treangen, T. J., & Phillippy, A. M. (2023) · Bioinformatics · doi:10.1093/bioinformatics/btad512 · Cited by 41
Self-citationDefence systems and horizontal gene transfer in bacteria
Kogay, R., Wolf, Y. I., & Koonin, E. V. (2024) · Environmental Microbiology · doi:10.1111/1462-2920.16630 · Cited by 43
Two decades of bacterial ecology and evolution in a freshwater lake
Rohwer, R. R., Kirkpatrick, M., Garcia, S. L., Kellom, M., McMahon, K. D., & Baker, B. J. (2025) · Nature Microbiology · doi:10.1038/s41564-024-01888-3 · Cited by 46
Gerhardt, K., Ruiz-Pérez, C. A., Rodriguez‐R, L. M., Jain, C., Tiedje, J. M., Cole, J. R., & Konstantinidis, K. T. (2025) · Nucleic Acids Research · doi:10.1093/nar/gkaf348 · Cited by 43
“…of FastAAI-based AAI values within phyla to determine whether or not reliable AAI thresholds can be identified that distinguish different ranks, similar to the 95% ANI that distinguishes (different) species [ 4 ] or the thresholds that distinguish domain and phylum ranks mentioned above.”
InfluentialSelf-citationA novel bacterial protein family that catalyses nitrous oxide reduction
He, G., Wang, W., Chen, G., Xie, Y., Parks, J. M., Davin, M. E., Hettich, R. L., Konstantinidis, K. T., & Löffler, F. E. (2025) · Nature · doi:10.1038/s41586-025-09401-4 · Cited by 48
Self-citationSoulenthone, P., Tachibana, Y., Suzuki, M., Mizuno, T., Ohta, Y., & Kasuya, K. (2021) · Polymer Degradation and Stability · doi:10.1016/j.polymdegradstab.2021.109481 · Cited by 42
Metagenomic Views of Microbial Communities in Sand Sediments Associated with Coral Reefs
Dong, X., Lan, H., Huang, L., Zhang, H., Lin, X., Weng, S., Peng, Y., Lin, J. H., Wang, J., Peng, J., et al. (2022) · Microbial Ecology · doi:10.1007/s00248-021-01957-8 · Cited by 43
Davison, H., Pilgrim, J., Wybouw, N., Parker, J., Pirro, S., Hunter-Barnett, S., Campbell, P. M., Blow, F., Darby, A. C., Hurst, G. D. D., et al. (2022) · Nature Communications · doi:10.1038/s41467-022-30385-6 · Cited by 45
Site‐tropism of streptococci in the oral microbiome
McLean, A. R., Torres‐Morales, J., Dewhirst, F. E., Borisy, G. G., & Welch, J. L. M. (2022) · Molecular Oral Microbiology · doi:10.1111/omi.12387 · Cited by 44
Gene flow and introgression are pervasive forces shaping the evolution of bacterial species
Diop, A., Torrance, E. L., Stott, C. M., & Bobay, L. (2022) · Genome biology · doi:10.1186/s13059-022-02809-5 · Cited by 42
“, using FastANI [4], in the fact that traditional ANI represents the average nucleotide identity of all orthologous genes shared by any two genomes while the ANI of core genes represents the average nucleotide identity of the core genes shared by a pair of genomes.”
BackgroundMethodResultInfluentialContrasting patterns of microbial dominance in the Arabidopsis thaliana phyllosphere
Lundberg, D. S., de Pedro‐Jové, R., Ayutthaya, P. P. N., Karasov, T. L., Shalev, O., Poersch, K., Ding, W., Bollmann‐Giolai, A., Bezrukov, I., & Weigel, D. (2022) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.2211881119 · Cited by 38
Kirdat, K., Tiwarekar, B., Sathe, S., & Yadav, A. (2023) · Frontiers in Microbiology · doi:10.3389/fmicb.2023.1123783 · Cited by 42
Pomaranski, E. K., Griffin, M. J., Camus, A. C., Armwood, A. R., Shelley, J., Waldbieser, G. C., LaFrentz, B. R., García, J. C., Yanong, R. P. E., & Soto, E. (2019) · INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY · doi:10.1099/ijsem.0.003838 · Cited by 42
van der Putten, B. C. L., Matamoros, S., Mende, D. R., Scholl, E. R., & Schultsz, C. (2021) · INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY · doi:10.1099/ijsem.0.004609 · Cited by 51
Govender, K. N., & Eyre, D. W. (2022) · Microbial Genomics · doi:10.1099/mgen.0.000886 · Cited by 48
Roy, C., Mandal, S. M., Mondal, S. K., Mukherjee, S., Mapder, T., Ghosh, W., & Chakraborty, R. (2020) · Genomics · doi:10.1016/j.ygeno.2020.11.003 · Cited by 37
“Sequence similarities between SARS-CoV-2 genome pairs were computed using the software FastANI, which uses a high throughput method for average nucleotide identity analysis [21].”
Metagenomic and Metatranscriptomic Study of Microbial Metal Resistance in an Acidic Pit Lake
Ayala, D. E., Burgos, W. D., Sánchez‐España, J., Couradeau, E., Falagán, C., & Macalady, J. L. (2020) · Microorganisms · doi:10.3390/microorganisms8091350 · Cited by 41
Strain Identification and Quantitative Analysis in Microbial Communities
Ghazi, A. R., Münch, P. C., Chen, D., Jensen, J., & Huttenhower, C. (2022) · Journal of Molecular Biology · doi:10.1016/j.jmb.2022.167582 · Cited by 44
McDaniel, E., Scarborough, M., Mulat, D., Lin, X., Sampara, P., Olson, H. M., Young, R., Eder, E., Attah, I. K., Markillie, L. M., et al. (2023) · The ISME Journal · doi:10.1038/s41396-023-01542-6 · Cited by 40
“Average nucleotide identity (ANI) values for genomes of interest were calculated using FastANI [47].”
BackgroundMethodNhu, N. T. K., Phan, M., Hancock, S. J., Peters, K. M., Álvarez-Fraga, L., Forde, B. M., Andersen, S. B., Miliya, T., Harris, P. N. A., Beatson, S. A., et al. (2023) · eLife · doi:10.7554/elife.91853 · Cited by 41
“Assembled contigs 432 were subject to taxonomic profiling using kraken2 [55] and fastANI [58].”
MethodSun, X., Huang, H., Wang, X., Wei, R.-Q., Niu, H.-Y., Chen, H. Y., Luo, M., Abdugheni, R., Wang, Y., Liu, F.-L., et al. (2024) · Gut Microbes · doi:10.1080/19490976.2024.2347725 · Cited by 42
Farag, I., Zhao, R., & Biddle, J. F. (2021) · Applied and Environmental Microbiology · doi:10.1128/aem.02584-20 · Cited by 37
“In addition to phylogenomic analysis, we calculated the average nucleotide identity (ANI) using FastANI (34) and average amino acid identity (AAI) using CompareM (https://github.”
MethodSun, Y., Debeljak, P., & Obernosterer, I. (2021) · The ISME Journal · doi:10.1038/s41396-021-00973-3 · Cited by 41
Braga, L. P. P., Pereira, R. V., Martins, L. F., Moura, L. M. S., Sanchez, F. B., Patané, J. S. L., da Silva, A. M., & Setúbal, J. C. (2021) · BMC Genomics · doi:10.1186/s12864-021-07957-9 · Cited by 42
Liao, Y.-S., Chen, B.-H., Teng, R.-H., Wang, Y.-W., Chang, J.-H., Liang, S.-Y., Tsao, C.-S., Hong, Y.-P., Sung, H.-Y., & Chiou, C. (2021) · Antimicrobial Agents and Chemotherapy · doi:10.1128/aac.01736-21 · Cited by 41
“com/ParBLiSS/FastANI) (62), antimicrobial resistance genes using AMRFinderPlus (https://www.”
MethodPopulation differentiation of Rhodobacteraceae along with coral compartments
Luo, D., Wang, X., Feng, X., Tian, M., Wang, S., Tang, S., Ang, P. O., Yan, A., & Luo, H. (2021) · The ISME Journal · doi:10.1038/s41396-021-01009-6 · Cited by 41
Huang, C.-T., Cho, S., Lin, Y.-C., Tan, C., Chiu, Y.-C., Yang, J., & Kuo, C. (2022) · Frontiers in Microbiology · doi:10.3389/fmicb.2022.773608 · Cited by 40
“1 (Jain et al., 2018) was used to calculate the proportion of genomic segments mapped and the average nucleotide identity (ANI).”
MethodZheng, P., Wei, Z., Zhou, Y., Li, Q., Qi, Z., Diao, X., & Wang, Y. (2022) · mSystems · doi:10.1128/msystems.00077-22 · Cited by 40
“The MAG Bin162 for clade A from SY40 was much different from those for clade B (Bin292, Bin295, and Bin296) in SY153 with ANI values of 69 to 70%, which is much lower than the values for a moderate affinity (ANI 80 to 90%) (33) and supports the divergency between the two marine clades.”
ResultOrellana, L. H., Krüger, K., Sidhu, C., & Amann, R. (2023) · Microbiome · doi:10.1186/s40168-023-01557-3 · Cited by 40
You, L., Jin, H., Kwok, L., Lv, R., Zhao, Z., Bilige, M., Sun, Z., Liu, W., & Zhang, H. (2023) · 中国科学通报:英文版 · doi:10.1016/j.scib.2023.09.001 · Cited by 43
Global emergence of Escherichia coli with PBP3 insertions
Long, H., Zhao, F., Feng, Y., & Zong, Z. (2024) · Journal of Antimicrobial Chemotherapy · doi:10.1093/jac/dkae393 · Cited by 40
Tian, S., Kim, M. S., Zhao, J., Heber, K., Hao, F., Koslicki, D., Tian, S., Singh, V., Patterson, A. D., & Bisanz, J. E. (2025) · Cell Host & Microbe · doi:10.1016/j.chom.2025.02.007 · Cited by 44
Metadata
- Authors
- Jain, C., Rodriguez-R, L. M., Phillippy, A. M., Konstantinidis, K. T., & Aluru, S.
- Affiliations
- National Institutes of Health (US)
- Georgia Institute of Technology (US)
- Corresponding author
- Konstantinidis, Konstantinos T.
- Aluru, Srinivas
- ORCID
- Venue
- Nature Communications
- Published
- 2018-11-30
- Volume
- 9
- Issue
- 1
- Pages
- 5114-5114
- ISSN
- 2041-1723 (ISSN-L)
- PMC
- PMC6269478
- OpenAlex
- W2951254987
- Cited by
- 5,748
- References
- 40
- Citations by year
- 2026: 1107 · 2025: 1110 · 2024: 977 · 2023: 789 · 2022: 695 · 2021: 617 · 2020: 305 · 2019: 128 · 2018: 16
- FWCI
- 96.11
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Nature Communications (publishedVersion, cc-by)
- bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, other-oa)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Funders
- National Science Foundation (1416259, 1816027, 1356288)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
- Health Sciences › Medicine › Microbiology (medical) › Bacterial Identification and Susceptibility Testing
- Physical Sciences › Environmental Science › Ecology › Microbial Community Ecology and Physiology
- Keywords
- average nucleotide identity, prokaryotic genomes, species boundaries, taxonomic classification, draft genome sequence
- MeSH terms
- Phylogeny, Prokaryotic Cells, Genetic Variation, Databases, Factual, Genome, Bacterial, Sequence Analysis, DNA
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