P HYLO P AT : AN UPDATED VERSION OF THE PHYLOGENETIC PATTERN DATABASE CONTAINS GENE NEIGHBORHOOD Presenter: Reihaneh Rabbany Presented in Bioinformatics Course (CMPUT 606), Instructed by Prof. Guohui Lin, Computing Science Department, University of Alberta, Winter 2009 Tim Hulsen et.al., Nucleic Acids Research, 2009, Vol. 37, Database issue

I NTRODUCTION Phylogenetic patterns Show the presence or absence of certain genes in a set of whole genome sequences Can be used to determine sets of genes that occur only in certain evolutionary branches More Common as increasing amounts of orthology data have become available Phylogenetic Patterns Search tools are available for querying proteins, but not for querying genes 2

P HYLO P AT PhyloPat is a database which offers the possibility of querying the Ensembl database using any phylogenetic pattern Functionalities : Gene neighborhood view Anticorrelating patterns Support of Entrez ‘ Gene IDs Direct sequence retrieval of members of a phylogenetic lineage 3

E NSEMBL Human genome 3 billion base-pairs 35,000 genes The genome alone is of little use Locations and relationships of individual genes Manual annotation Ensembl Ensembl (freely accessible) Sequence data is fed into a software "pipeline“ Creates a set of predicted gene locations Saves them in a MySQL database Originally focus on Human Now includes mouse, fruitfly, zebrafish, plants, fungi, … 4

P HYLO P AT - D ATABASE C ONTENT A set of phylogenetic lineages Complete set of orthologies Collected All 39 species’ genes in Ensembl 741 species pairs genes orthologous relationships one-to-one one-to-many many-to-many Ensembl ortholog detection pipeline Similarity values by Best reciprocal hits and best score ratio (WU BLASTP) Graph of gene relations and Clustering Multiple alignment (MUSCLE ) Phylogenetic tree (TreeBeST ) Orthologous relationships 5

P HYLO P AT - D ATABASE C ONSTRUCTION Generating phylogenetic lineages Determining evolutionary order Using the NCBI Taxonomy Phylogenetic tree  Phylogenetic lineages For each gene in the first species Look for orthologs in the other species Add all orthologs to the phylogenetic lineage Check for orthologs themselves, until no additional orthologies were found for any of the genes Repeat for all genes in all 39 species that were not yet connected to any phylogenetic lineage 6

W EB A PPLICATION A web interface Query the PhyloPat MySQL database Phylogenetic lineages Phylogenetic patterns 7

O MNIPRESENT - O LIGOPRESENT - P OLYPRESENT G ENES Omnipresent Genes present in all 39 species phylogenetic pattern ‘ ’ (or MySQL regular expression ‘^1+$’) 688 omnipresent genes Which most likely have important functions, since they are present in all species. Oligopresent Genes that exist in only one or two species Which species are evolutionary most related Polypresent Genes that are missing in only one or two species Measure for evolutionary relatedness 8

A NTICORRELATING PATTERNS Patterns that are exactly opposite Phylogenetic lineages with anticorrelating patterns can be functionally completely different, but could also be highly similar in function ‘ ’ ‘ ’ These genes can be analogous i.e. performing a similar function without being evolutionary related. 9

G ENE N EIGHBORHOOD Inferring ‘true’ orthology Orthologous conservation of gene neighborhood Human gene ENSG Has two predicted orthologs in chimpanzee: gene ENSPTRG gene ENSPTRG Only correspond to the gene neighborhoods of gene ENSPTRG , for nine of the nearest neighbors Inferring functional annotation Build hypotheses about the processes or pathways that genes might be involved in 10

FASTA- FORMAT S EQUENCE F ILES Both the pattern search output and the gene neighborhood view contain links to FASTA files of the peptide sequences 11

D ISCUSSION AND C ONCLUSION PhyloPat is useful in Orthology detection Evolutionary studies Gene annotation Complex Queries It is possible to determine A species set that should be included (1), A species set that should be excluded (0) A species set which presence is indifferent (*) Using of regular expression queries Easy-to-use web interface Relies only on one database (Ensembl) 12

D ISCUSSION AND C ONCLUSION (C ONT.) Gene neighborhood view Locating evolutionary-related genomic clusters of genes Detecting the ‘true orthologs’ within large sets of predicted orthologs Functional annotating less well known genes PhyloPat will be updated with each major Ensembl release to ensure up-to-date and reliable phylogenetic lineages (species added) 13

L INEAGE INFORMATION OF PP

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