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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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“0 100 200 300 EGTs Rattus norvegicus (0) Neurospora crassa (0) Dictyostelium discoideum (1) Tetrahymena thermophila (1) Thecamonas trahens (1) Cryptosporidium muris (3) Phytophthora capsici (6) Hematodinium sp SG-2012 (10) Paraphysomonas bandaiensis (12) Rhodelphids (14) Telonema subtile (15) Picozoa (16) Toxoplasma g…”
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“1.32; Jain et al., 2018) and CompareM (ver.”
BackgroundInfluentialBatista, B. D., Dourado, M. N., Figueredo, E. F., Hortencio, R. O., Marques, J. P. R., Piotto, F. Â., Bonatelli, M. L., Settles, M. L., de Azevedo, J. L., & Quecine, M. C. (2021) · Archives of Microbiology · doi:10.1007/s00203-021-02361-z · Cited by 108
An early origin of iron–sulfur cluster biosynthesis machineries before Earth oxygenation
Garcia, P. S., D’Angelo, F., de Choudens, S. O., Dussouchaud, M., Bouveret, E., Gribaldo, S., & Barras, F. (2022) · Nature Ecology & Evolution · doi:10.1038/s41559-022-01857-1 · Cited by 103
Rapid ecosystem-scale consequences of acute deoxygenation on a Caribbean coral reef
Johnson, M. D., Scott, J. J., Leray, M., Lucey, N., Bravo, L. M. R., Wied, W. L., & Altieri, A. H. (2021) · Nature Communications · doi:10.1038/s41467-021-24777-3 · Cited by 99
Zervas, A., Aggerbeck, M. R., Allaga, H., Güzel, M., Hendriks, M., Jonuškienė, I., Kedves, O., Kupeli, A., Lamovšek, J., Mülner, P., et al. (2020) · Microorganisms · doi:10.3390/microorganisms8122028 · Cited by 100
Bacterial endosymbionts protect beneficial soil fungus from nematode attack
Büttner, H., Niehs, S. P., Vandelannoote, K., Cseresnyés, Z., Dose, B., Richter, I., Gerst, R., Figge, M. T., Stinear, T. P., Pidot, S. J., et al. (2021) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.2110669118 · Cited by 100
Yuan, J., Zhou, J., Zhou, J., Hu, M., Zhang, Q., Kong, N., Ren, H., Liang, L., & Yue, J. (2020) · Biology Direct · doi:10.1186/s13062-020-0258-5 · Cited by 102
Palmer, M., Steenkamp, E. T., Blom, J., Hedlund, B. P., & Venter, S. N. (2020) · INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY · doi:10.1099/ijsem.0.004124 · Cited by 102
Comprehensive mouse microbiota genome catalog reveals major difference to its human counterpart
Kieser, S., Zdobnov, E. M., & Trajkovski, M. (2022) · PLoS Computational Biology · doi:10.1371/journal.pcbi.1009947 · Cited by 99
“95% ANI was used as a threshold to delineate genomes from the same species [18,19].”
MethodStrainGE: a toolkit to track and characterize low-abundance strains in complex microbial communities
van Dijk, L. R., Walker, B. J., Straub, T. J., Worby, C. J., Grote, A., Schreiber, H. L., Anyansi, C., Pickering, A. J., Hultgren, S. J., Manson, A. L., et al. (2022) · Genome biology · doi:10.1186/s13059-022-02630-0 · Cited by 93
“The reads from a metagenomic sample are then aligned to the concatenated reference using BWA mem (25), removing read pairs with 1) improper pairing; 2) clipped alignment; or 3) implied insert size smaller than the read length.”
MethodInfluentialCarbon fixation rates in groundwater similar to those in oligotrophic marine systems
Overholt, W. A., Trumbore, S. E., Xu, X., Bornemann, T. L. V., Probst, A. J., Krüger, M., Herrmann, M., Thamdrup, B., Bristow, L. A., Taubert, M., et al. (2022) · Nature Geoscience · doi:10.1038/s41561-022-00968-5 · Cited by 103
Hou, J., Wang, Y., Zhu, P., Yang, N., Liang, L., Yu, T., Niu, M., Konhauser, K. O., Woodcroft, B. J., & Wang, F. (2023) · Science Advances · doi:10.1126/sciadv.adf5069 · Cited by 108
“After removing the MAGs assigned to other microbial lineages, the average nuclear acid identities (ANIs) between pairwise sets of MAGs were calculated by using FastANI ( 82 ).”
Sequencing-based analysis of microbiomes
Pinto, Y., & Bhatt, A. S. (2024) · Nature Reviews Genetics · doi:10.1038/s41576-024-00746-6 · Cited by 109
“Whereas species boundaries are generally well defined, there is debate over the exact definition of ‘strains’ within microbiology 71–73 .”
Mobile antimicrobial resistance genes in probiotics
Tóth, A. G., Csabai, I., Judge, M. F., Maróti, G., Becsei, Á., Spisák, S., & Solymosi, N. (2021) · doi:10.1101/2021.05.04.442546 · Cited by 97
Tully, B. (2019) · Nature Communications · doi:10.1038/s41467-018-07840-4 · Cited by 92
Oñate, F. P., Chamignon, C., Burz, S. D., Lapaque, N., Monnoye, M., Philippe, C., Bredel, M., Chêne, L., Farin, W., Paillarse, J.-M., et al. (2023) · International Journal of Molecular Sciences · doi:10.3390/ijms241512232 · Cited by 97
Ecosystem-wide metagenomic binning enables prediction of ecological niches from genomes
Alneberg, J., Bennke, C. M., Beier, S., Bunse, C., Quince, C., Ininbergs, K., Riemann, L., Ekman, M., Jürgens, K., Labrenz, M., et al. (2020) · Communications Biology · doi:10.1038/s42003-020-0856-x · Cited by 93
Major genetic discontinuity and novel toxigenic species in Clostridioides difficile taxonomy
Knight, D. R., Imwattana, K., Kullin, B., Guerrero-Araya, E., Paredes‐Sabja, D., Didelot, X., Dingle, K. E., Eyre, D. W., Rodríguez, C., & Riley, T. V. (2021) · eLife · doi:10.7554/elife.64325 · Cited by 98
“…Center for Biotechnology Information (NCBI) (Ciufo et al., 2018), ANI provides a pre- cise, objective, and scalable method for delineation of species, defined as monophyletic groups of strains with genomes that exhibit at least 96% ANI (Jain et al., 2018; Richter and Rosselló-Móra, 2009).”
BackgroundMethodInfluentialComprehensive dataset of shotgun metagenomes from oxygen stratified freshwater lakes and ponds
Buck, M., Garcia, S. L., Fernández, L., Martin, G., Martínez-Rodríguez, G. A., Saarenheimo, J., Zopfi, J., Bertilsson, S., & Peura, S. (2021) · Scientific Data · doi:10.1038/s41597-021-00910-1 · Cited by 96
Mende, D. R., Letunić, I., Maistrenko, O. M., Schmidt, T., Milanese, A., Paoli, L., Hernández-Plaza, A., Orakov, A. N., Forslund, S. K., Sunagawa, S., et al. (2019) · Nucleic Acids Research · doi:10.1093/nar/gkz1002 · Cited by 90
Defining the Rhizobium leguminosarum Species Complex
Young, J. P. W., Moeskjær, S., Afonin, A. М., Rahi, P., Maluk, M., James, E. K., Cavassim, M. I. A., Rashid, M. H.-O., Aserse, A. A., Perry, B. J., et al. (2021) · Genes · doi:10.3390/genes12010111 · Cited by 95
“31 [71] with the default settings (kmer = 16, fragment length = 3000, minimum shared fraction = 0.”
BackgroundDiet leaves a genetic signature in a keystone member of the gut microbiota
Dapa, T., Ramiro, R. S., Pedro, M. F., Gordo, I., & Xavier, K. B. (2022) · Cell Host & Microbe · doi:10.1016/j.chom.2022.01.002 · Cited by 91
Beyond DNA barcoding: The unrealized potential of genome skim data in sample identification
Bohmann, K., Mirarab, S., Bafna, V., & Gilbert, M. T. P. (2020) · Molecular Ecology · doi:10.1111/mec.15507 · Cited by 90
“(2018). A Sequel to Sanger: Amplicon sequencing that scales. BMC Genomics, 19(1), 219. https://doi.org/10.1186/s1286 4-018-4611-3 Hebert, P. D. N., Cywinska, A., Ball, S. L., & deWaard, J. R. (2003). Biological identifications through DNA barcodes. Proceedings. Biological Sciences/The Royal Society, 270(1512), 313–321…”
BackgroundInfluentialGenomic insights into the phylogeny and biomass-degrading enzymes of rumen ciliates
Li, Z., Wang, X., Zhang, Y., Yu, Z., Zhang, T., Dai, X., Pan, X., Jing, R., Yan, Y., Liu, Y., et al. (2022) · The ISME Journal · doi:10.1038/s41396-022-01306-8 · Cited by 100
Dove, N. C., Torn, M. S., Hart, S. C., & Taş, N. (2021) · Nature Communications · doi:10.1038/s41467-021-22408-5 · Cited by 96
Gut microbiota modulates weight gain in mice after discontinued smoke exposure
Fluhr, L., Mor, U., Kolodziejczyk, A. A., Dori-Bachash, M., Leshem, A., Itav, S., Cohen, Y., Suez, J., Zmora, N., Moresi, C., et al. (2021) · Nature · doi:10.1038/s41586-021-04194-8 · Cited by 95
Zaid, D. S., Cai, S., Hu, C., Li, Z., & Li, Y. (2022) · Microbiology Spectrum · doi:10.1128/spectrum.02169-21 · Cited by 92
“The genomes of sequenced Bacillus strains were compared with the B. velezensis HNA3 genome using the average nucleotide identity analysis tool FastANI (92).”
MethodFunctional Insights into the Kelp Microbiome from Metagenome-Assembled Genomes
Weigel, B. L., Miranda, K. K., Fogarty, E. C., Watson, A. R., & Pfister, C. A. (2022) · mSystems · doi:10.1128/msystems.01422-21 · Cited by 93
“The demarcation for a bacterial species using whole-genome average nucleotide identity (ANI) is typically$95% (35), while ANI values across genera average 73% (36).”
BackgroundMethodInfluentialCamargo, A. P., de Souza, R. S. C., José, J., Gerhardt, I. R., Dante, R. A., Mukherjee, S., Huntemann, M., Kyrpides, N. C., Carazzolle, M. F., & Arruda, P. (2022) · The ISME Journal · doi:10.1038/s41396-022-01345-1 · Cited by 92
Daza, M. V. B., Cortimiglia, C., Bassi, D., & Cocconcelli, P. S. (2021) · INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY · doi:10.1099/ijsem.0.004948 · Cited by 96
A key genetic factor governing arabinan utilization in the gut microbiome alleviates constipation
Zhang, C., Yu, L., Ma, C., Jiang, S., Zhang, Y., Wang, S., Tian, F., Xue, Y., Zhao, J., Zhang, H., et al. (2023) · Cell Host & Microbe · doi:10.1016/j.chom.2023.10.011 · Cited by 98
Całusińska, M., Marynowska, M., Bertucci, M., Untereiner, B., Klimek, D., Goux, X., Sillam‐Dussès, D., Gawron, P., Halder, R., Wilmes, P., et al. (2020) · Communications Biology · doi:10.1038/s42003-020-1004-3 · Cited by 87
Rat, A., Naranjo, H. D., Krigas, N., Grigoriadou, K., Maloupa, E., Alonso, A. V., Schneider, C., Papageorgiou, V. P., Assimopoulou, A. N., Tsafantakis, N., et al. (2021) · Frontiers in Microbiology · doi:10.3389/fmicb.2021.633488 · Cited by 89
Blanco‐Míguez, A., Beghini, F., Cumbo, F., McIver, L. J., Thompson, K. N., Zolfo, M., Manghi, P., Dubois, L., Huang, K. D., Thomas, A. M., et al. (2022) · bioRxiv (Cold Spring Harbor Laboratory) · doi:10.1101/2022.08.22.504593 · Cited by 89
Estimating Pangenomes with Roary
Sitto, F., & Battistuzzi, F. U. (2019) · Molecular Biology and Evolution · doi:10.1093/molbev/msz284 · Cited by 89
Shi, W., Sun, Q., Fan, G., Hideaki, S., Ohkuma, M., Itoh, T., Zhou, Y., Cai, M., Kim, S.-G., Lee, J., et al. (2020) · Nucleic Acids Research · doi:10.1093/nar/gkaa957 · Cited by 87
“Various genome similarity metrics, including ANIb (60), FastANI (61), orthoANIb and orthoANIu (62), are provided for the calculation of similarity between a submitted genome sequence and the selected sequences.”
BackgroundPanACoTA: A modular tool for massive microbial comparative genomicsPreprint
Perrin, A., & Rocha, E. P. C. (2020) · bioRxiv (Cold Spring Harbor Laboratory) · doi:10.1093/nargab/lqaa106 · Cited by 103
“For example, using 15 cores, FastANI [27] requires around 1h15 to compare all pairs of 200 genomes (40,000 pairwise comparisons), where Mash with a sketch size of 106 does the task in less than 3 minutes.”
Method
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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