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HMMER

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tools calculate match scores using only the best scoring alignment, HMMER3 calculates match scores by integrating across all possible alignments, to account for uncertainty in which alignment is best. HMMER sequence alignments are accompanied by posterior probability annotations, indicating which portions of the alignment have been assigned high confidence and which are more uncertain.
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that residue has been observed in that column of the alignment, but also incorporates prior information on patterns of residues that tend to co-occur in the same columns of sequence alignments. This string of match states emitting amino acids at particular frequencies is analogous to position specific score matrices or weight matrices.
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While HMMER2 could perform local alignment (align a complete model to a subsequence of the target) and global alignment (align a complete model to a complete target sequence), HMMER3 only performs local alignment. This restriction is due to the difficulty in calculating the significance of hits when
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The major advance in speed was made possible by the development of an approach for calculating the significance of results integrated over a range of possible alignments. In discovering remote homologs, alignments between query and hit proteins are often very uncertain. While most sequence alignment
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The HMMER2 and HMMER3 releases used an architecture for building profile HMMs called the Plan 7 architecture, named after the seven states captured by the model. In addition to the three major states (M, I and D), six additional states capture non-homologous flanking sequence in the alignment. These
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A profile HMM takes this modelling of sequence alignments further by modelling insertions and deletions, using I and D states, respectively. D states do not emit a residue, while I state do emit a residue. Multiple I state can occur consecutively, corresponding to multiple residues between consensus
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Profile HMMs center around a linear set of match (M) states, with one state corresponding to each consensus column in a sequence alignment. Each M state emits a single residue (amino acid or nucleotide). The probability of emitting a particular residue is determined largely by the frequency at which
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A profile HMM is a variant of an HMM relating specifically to biological sequences. Profile HMMs turn a multiple sequence alignment into a position-specific scoring system, which can be used to align sequences and search databases for remotely homologous sequences. They capitalise on the fact that
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constructed explicitly for a particular search) to either a single sequence or a database of sequences. Sequences that score significantly better to the profile-HMM compared to a null model are considered to be homologous to the sequences that were used to construct the profile-HMM. Profile-HMMs
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in the United Kingdom, while development of the algorithm is still performed by Sean Eddy's team in the United States. Major reasons for relocating the web service were to leverage the computing infrastructure at the EBI, and to cross-link HMMER searches with relevant databases that are also
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certain positions in a sequence alignment tend to have biases in which residues are most likely to occur, and are likely to differ in their probability of containing an insertion or a deletion. Capturing this information gives them a better ability to detect true homologs than traditional
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A major aim of the HMMER3 project, started in 2004 was to improve the speed of HMMER searches. While profile HMM-based homology searches were more accurate than BLAST-based approaches, their slower speed limited their applicability. The main performance gain is due to a
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6 states collectively are important for controlling how sequences are aligned to the model, e.g. whether a sequence can have multiple consecutive hits to the same model (in the case of sequences with multiple instances of the same domain).
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columns in an alignment. M, I and D states are connected by state transition probabilities, which also vary by position in the sequence alignment, to reflect the different frequencies of insertions and deletions across sequence alignments.
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The latest stable release of HMMER is version 3.0. HMMER3 is complete rewrite of the earlier HMMER2 package, with the aim of improving the speed of profile-HMM searches. Major changes are outlined below:
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In addition to the software package, the HMMER search function is available in the form of a web server. The service facilitates searches across a range of databases, including sequence databases such as
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HMMER still lags behind BLAST in speed of DNA-based searches; however, DNA-based searches can be tuned such that an improvement in speed comes at the expense of accuracy.
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Finn, Robert D.; Clements, Jody; Arndt, William; Miller, Benjamin L.; Wheeler, Travis J.; Schreiber, Fabian; Bateman, Alex; Eddy, Sean R. (1 July 2015).
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Krogh A, Brown M, Mian IS, Sjölander K, Haussler D (February 1994). "Hidden Markov models in computational biology. Applications to protein modeling".
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that finds high-scoring un-gapped matches within database sequences to a query profile. This heuristic results in a computation time comparable to
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Several implementations of profile HMM methods and related position-specific scoring matrix methods are available. Some are listed below:
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The HMMER package consists of a collection of programs for performing functions using profile hidden Markov models. The programs include:
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A major improvement in HMMER3 was the inclusion of DNA/DNA comparison tools. HMMER2 only had functionality to compare protein sequences.
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program. The profile-HMM implementation used in the HMMER software was based on the work of Krogh and colleagues. HMMER is a
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to increase computational speed. This work is based upon an earlier publication showing a significant acceleration of the
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International Conference on Computational Intelligence Methods for Bioinformatics and Biostatistics
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organisation of the hits. Search results can then be filtered according to either parameter.
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Microsoft Research - University of Trento Centre for Computational and Systems Biology
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The search results are accompanied by a report on the taxonomic breakdown, and the
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sequences, and to perform sequence alignments. It detects homology by comparing a
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Biological Sequence Analysis: Probabilistic Models of Proteins and Nucleic Acids
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A blog posting on HMMER policy on trademark, copyright, patents, and licensing
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with little impact on accuracy. Further gains in performance are due to a
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and commonly used software package for sequence analysis written by
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nhmmscan – search nucleotide sequences against a nucleotide profile
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nhmmer – search DNA/RNA queries against a DNA/RNA sequence database
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jackhmmer – iteratively search sequences against a protein database
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hmmbuild – construct profile HMMs from multiple sequence alignments
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hmmscan – search protein sequences against a profile HMM database
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HMMER is the core utility that protein family databases such as
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Finn, Robert D.; Clements, Jody; Eddy, Sean R. (2011-07-01).
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African Society for Bioinformatics and Computational Biology
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performing local/global alignments using the new algorithm.
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phmmer – search protein sequences against a protein database
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Max Planck Institute of Molecular Cell Biology and Genetics
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The package contains numerous other specialised functions.
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hmmsearch – search profile HMMs against a sequence database
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International Nucleotide Sequence Database Collaboration
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are based upon. Some other bioinformatics tools such as
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Eddy, Sean R.; Pearson, William R. (20 October 2011).
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hmmemit – produce sample sequences from a profile HMM
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A profile HMM modelling a multiple sequence alignment
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Rost, Burkhard (ed.). 16:Software package for sequence analysis 1476:International Society for Biocuration 1374:European Molecular Biology Laboratory 1099: 415: 315: 1698: 718: 1502:Japanese Society for Bioinformatics 250:HMMER3 also makes extensive use of 184:. Its general usage is to identify 13: 1464:European Molecular Biology network 1125: 765:"Accelerated Profile HMM Searches" 340: 220:, including different versions of 14: 1757: 1554:Pacific Symposium on Biocomputing 1458:Australia Bioinformatics Resource 1425:Swiss Institute of Bioinformatics 1408:Netherlands Bioinformatics Centre 1368:European Bioinformatics Institute 1070: 1050:Sean R. Eddy; Travis J. Wheeler. 853:Sean R. Eddy; Travis J. Wheeler. 1697: 1686: 1685: 1356:Database Center for Life Science 1344:Computational Biology Department 1232:Arabidopsis Information Resource 1054:. and the HMMER development team 860:. and the HMMER development team 831: 1202:Specialised genomic databases: 1043: 924: 884:"HMMER web server: 2015 update" 738:10.1093/bioinformatics/14.9.755 609:Durbin, Richard; Sean R. Eddy; 478:Restriction to local alignments 446:, and allows the more accurate 261: 208:in the HMMER package using the 1403:Japanese Institute of Genetics 825: 721:"Profile hidden Markov models" 617:. Cambridge University Press. 602: 352:hmmlogo – produce data for an 216:utility ported to every major 1: 1736:Free software programmed in C 1323:Rosalind (education platform) 1240:Zebrafish Information Network 1208:Saccharomyces Genome Database 943:(Web Server issue): W29–W37. 692:10.1093/bioinformatics/btl582 573: 298:Programs in the HMMER package 1746:Free bioinformatics software 1653:List of biological databases 1172:Protein Information Resource 1018:10.1371/journal.pcbi.1000069 800:10.1371/journal.pcbi.1002195 381:, and HMM databases such as 258:for aligning two sequences. 7: 1146:European Nucleotide Archive 613:; Graeme Mitchison (1998). 498:Sequence alignment software 486: 206:multiple sequence alignment 10: 1762: 1052:"HMMER3.1b2 Release Notes" 769:PLOS Computational Biology 1681: 1635: 1569: 1511: 1444: 1431:Wellcome Sanger Institute 1385:J. Craig Venter Institute 1331: 1309: 1248: 1133: 673:Farrar M (January 2007). 149: 137: 124: 114: 104: 73: 69: 47: 43: 33: 24: 1414:Philippine Genome Center 256:Smith-Waterman algorithm 1726:Bioinformatics software 1658:Molecular phylogenetics 1154:China National GeneBank 470:DNA sequence comparison 412:maintained by the EBI. 204:are constructed from a 56:; 13 months ago 54:3.4 / 15 August 2023 1362:DNA Data Bank of Japan 1150:DNA Data Bank of Japan 937:Nucleic Acids Research 888:Nucleic Acids Research 652:10.1006/jmbi.1994.1104 282: 170: 1741:Computational science 1731:Free science software 1643:Computational biology 1158:Secondary databases: 834:"HMMER2 User's Guide" 425:Improvements in speed 277: 168: 1140:Sequence databases: 855:"HMMER User's Guide" 364:The HMMER web server 306:Profile HMM building 1436:Whitehead Institute 1224:Rat Genome Database 1086:HMMER3 announcement 1009:2008PLSCB...4E0069E 781:2011PLSCB...7E2195E 493:Hidden Markov model 252:vector instructions 201:Hidden Markov model 21: 1673:Sequence alignment 1380:Flatiron Institute 949:10.1093/nar/gkr367 900:10.1093/nar/gkv397 416:The HMMER3 release 316:Homology searching 283: 171: 19: 1713: 1712: 1668:Sequence database 1182:Protein Data Bank 1176:Other databases: 719:Eddy, SR (1998). 379:Protein Data Bank 163: 162: 1753: 1701: 1700: 1689: 1688: 1648:List of biobanks 1612:Stockholm format 1420:Scripps Research 1120: 1113: 1106: 1097: 1096: 1082: 1081: 1079:Official website 1064: 1063: 1061: 1059: 1047: 1041: 1040: 1030: 1020: 997:PLOS Comput Biol 988: 979: 978: 968: 928: 922: 921: 911: 879: 870: 869: 867: 865: 859: 850: 841: 840: 838: 829: 823: 822: 812: 802: 792: 775:(10): e1002195. 760: 751: 750: 740: 716: 705: 704: 694: 670: 664: 663: 635: 629: 628: 606: 600: 599: 597: 595: 590:. 15 August 2023 584: 432:heuristic filter 356:from an HMM file 247:also use HMMER. 218:operating system 159: 156: 97: 92: 89: 87: 85: 64: 62: 57: 29: 22: 18: 1761: 1760: 1756: 1755: 1754: 1752: 1751: 1750: 1716: 1715: 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Retrieved 1045: 1000: 996: 940: 936: 926: 891: 887: 862:. Retrieved 832:Eddy, Sean. 827: 772: 768: 728: 724: 682: 678: 668: 643: 640:J. Mol. Biol 639: 633: 614: 611:Anders Krogh 604: 594:18 September 592:. Retrieved 582: 512: 481: 473: 464: 456: 428: 419: 406: 399: 367: 359: 301: 292: 288: 284: 279: 265: 262:Profile HMMs 249: 234: 209: 196: 173: 172: 115:Available in 35:Developer(s) 1577:CRAM format 1498:(CSIR-IGIB) 568:DeCypherHMM 391:SUPERFAMILY 197:profile-HMM 1720:Categories 1663:Sequencing 1627:GTF format 1622:GFF format 1617:VCF format 1607:SAM format 1370:(EMBL-EBI) 1296:SOAP suite 1216:VectorBase 1178:BioNumbers 1164:Swiss-Prot 574:References 454:sequence. 452:homologous 377:, and the 193:nucleotide 186:homologous 105:Written in 75:Repository 1490:(ISCB-SC) 1460:(EMBL-AR) 1393:(MPI-CBG) 1134:Databases 957:0305-1048 785:CiteSeerX 563:GPU-HMMER 553:META-MEME 528:PSI-BLAST 375:SwissProt 182:Sean Eddy 1692:Category 1562:(RECOMB) 1512:Meetings 1466:(EMBnet) 1316:Server: 1291:SAMtools 1286:PANGOLIN 1249:Software 1228:PHI-base 1220:WormBase 1190:InterPro 1037:18516236 975:21593126 918:25943547 819:22039361 701:17110365 543:GENEWISE 518:HH-suite 487:See also 444:E-values 395:Programs 387:TIGRFAMs 354:HMM logo 241:InterPro 210:hmmbuild 1704:Commons 1539:(InCoB) 1484:(ISCB) 1472:(INSDC) 1454:(ASBCB) 1358:(DBCLS) 1352:(COSBI) 1266:Clustal 1212:FlyBase 1186:Ensembl 1160:UniProt 1142:GenBank 1058:23 July 1028:2396288 1005:Bibcode 966:3125773 909:4489315 864:23 July 810:3197634 777:Bibcode 747:9918945 660:8107089 538:PFTOOLS 533:MMseqs2 371:UniProt 226:Windows 214:console 189:protein 150:Website 139:License 119:English 59: ( 1545:(CIBB) 1533:(ISMB) 1527:(ECCB) 1504:(JSBi) 1410:(NBIC) 1399:(NCBI) 1387:(JCVI) 1376:(EMBL) 1364:(DDBJ) 1318:ExPASy 1301:TopHat 1281:MUSCLE 1271:EMBOSS 1261:Bowtie 1236:GISAID 1196:, and 1168:TrEMBL 1035:  1025:  973:  963:  955:  916:  906:  817:  807:  787:  745:  699:  658:  621:  558:BLOCKS 402:domain 228:, and 90:/hmmer 84:github 1556:(PSB) 1478:(ISB) 1427:(SIB) 1416:(PGC) 1346:(CBD) 1310:Other 1276:HMMER 1256:BLAST 858:(PDF) 837:(PDF) 548:PROBE 508:UGENE 436:BLAST 269:BLAST 245:UGENE 230:macOS 222:Linux 176:is a 174:HMMER 155:hmmer 144:BSD-3 20:HMMER 1238:and 1204:BOLD 1194:KEGG 1170:and 1152:and 1060:2017 1033:PMID 971:PMID 953:ISSN 914:PMID 866:2017 815:PMID 743:PMID 697:PMID 656:PMID 619:ISBN 596:2023 503:Pfam 389:and 383:Pfam 239:and 237:Pfam 178:free 157:.org 133:tool 126:Type 86:.com 1023:PMC 1013:doi 961:PMC 945:doi 904:PMC 896:doi 805:PMC 795:doi 733:doi 687:doi 648:doi 644:235 523:SAM 199:(a 191:or 1722:: 1521:() 1234:, 1230:, 1226:, 1222:, 1218:, 1214:, 1210:, 1206:, 1192:, 1188:, 1184:, 1180:, 1166:, 1148:, 1144:, 1031:. 1021:. 1011:. 999:. 995:. 983:^ 969:. 959:. 951:. 941:39 939:. 935:. 912:. 902:. 892:43 890:. 886:. 874:^ 845:^ 813:. 803:. 793:. 783:. 771:. 767:. 755:^ 741:. 729:14 727:. 723:. 709:^ 695:. 683:23 681:. 677:. 654:. 642:. 385:, 373:, 232:. 224:, 1119:e 1112:t 1105:v 1062:. 1039:. 1015:: 1007:: 1001:4 977:. 947:: 920:. 898:: 868:. 839:. 821:. 797:: 779:: 773:7 749:. 735:: 703:. 689:: 662:. 650:: 627:. 598:. 280:. 109:C 63:)

Index


Developer(s)
Stable release
Repository
github.com/EddyRivasLab/hmmer
Edit this at Wikidata
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English
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License
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hmmer.org

free
Sean Eddy
homologous
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nucleotide
Hidden Markov model
multiple sequence alignment
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vector instructions

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