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miRBase A Public Resource for miRNA Sequences, Predicted Targets, and Nomenclature Materials prepared by: Jennifer M. Williams, Ph.D. Agnes J. Radek, Ph.D. Updated: Q Version 2
Copyright OpenHelix. No use or reproduction without express written consent3 miRBase Agenda Introduction and Credits Basic Search & Results Deep Sequencing Report Advanced Search Options Additional Features Summary Exercises miRBase:
Copyright OpenHelix. No use or reproduction without express written consent4 miRBase Homepage & Credits Database Registry Services Target Info Biotechnology and Biological Sciences Research Council
Copyright OpenHelix. No use or reproduction without express written consent5 History of microRNAs microRNA conventions change as field develops miRBase updated regularly
Copyright OpenHelix. No use or reproduction without express written consent6 MicroRNA Biogenesis 1. Transcription of miRNA in the nucleus → pri-miRNA 2. Excision of stem-loop (a.k.a. hairpin) precursor that contains the microRNA sequence in one arm of the hairpin → pre-miRNA. Transport to cytoplasm 3. Processing of the stem-loop precursor into double-stranded RNA 4. Formation of mature miRNA miRBase::Sequences stores pre-miRNA and mature miRNA sequences cel-mir-2 cel-miR-2 mature
Copyright OpenHelix. No use or reproduction without express written consent7 microRNA – What is in the Name? GENERAL FORM: species code – mir/miR – number-(suffix) e.g. cel-mir-2 Orthologs → identical number There are exceptions Mature miRNA from BOTH strands of hairpin→ 5p/3p suffix Same mature sequence, different locus→ numerical suffix: Chrom 10 mouse human rat Danio rerio Chrom 25 Chrom 22 Chrom 5 mmu-miR-142-5p mmu-miR-142-3p Related mature sequences → lettered suffix dre-miR-27e dre-miR-27a dre-miR-27d dre-miR-27b
Copyright OpenHelix. No use or reproduction without express written consent8 miRBase References
Copyright OpenHelix. No use or reproduction without express written consent9 miRBase Agenda Introduction and Credits Basic Search & Results Deep Sequencing Report Advanced Search Options Additional Features Summary Exercises miRBase:
Copyright OpenHelix. No use or reproduction without express written consent10 miRBase Homepage: Database Registry Services Target Info focus
Copyright OpenHelix. No use or reproduction without express written consent11 miRBase Basic Keyword Search mir-307 click Unique miRNAs click
Stem-loop Sequence References Copyright OpenHelix. No use or reproduction without express written consent12 miRNA Entry Page Mature Sequence(s) mature miRNAs Basic precursor information FASTA seq. Past notation miR-307a and miR-307a* (“minor” product)
Stem-loop Sequence References Copyright OpenHelix. No use or reproduction without express written consent13 Entry Page, Top Mature Sequence(s) mature miRNAs Past notation miR-307a and miR-307a* (“minor” product) Deep Sequencing Report
Copyright OpenHelix. No use or reproduction without express written consent14 Entry Page, Genome Context Region, gene & transcript info available
Copyright OpenHelix. No use or reproduction without express written consent15 Entry Page, Related Sequences Display options click
Copyright OpenHelix. No use or reproduction without express written consent16 Entry Page, Mature MicroRNA dme-miR-307a-3p Links to predicted mRNA targets dme-miR-307a-5p
Target information aggregated from various resources Copyright OpenHelix. No use or reproduction without express written consent17 Entry Page, Target Information Links to predicted mRNA targets Run another search
Copyright OpenHelix. No use or reproduction without express written consent18 miRBase Agenda Introduction and Credits Basic Search & Results Deep Sequencing Report Advanced Search Options Additional Features Summary Exercises miRBase:
Copyright OpenHelix. No use or reproduction without express written consent19 Entry Page, Top Deep Sequencing Report
Copyright OpenHelix. No use or reproduction without express written consent20 Deep Sequencing Report: Top Reads Counts Stem-loop Mature product(s) Read report
Copyright OpenHelix. No use or reproduction without express written consent21 Deep Sequencing Report: Middle & Bottom Read report Set limits
Copyright OpenHelix. No use or reproduction without express written consent22 miRBase Agenda Introduction and Credits Basic Search & Results Deep Sequencing Report Advanced Search Options Additional Features Summary Exercises miRBase:
Copyright OpenHelix. No use or reproduction without express written consent23 Advanced Search Tab Quick search Tissue Expression Sequence Search Genomic Location Clusters Search
Copyright OpenHelix. No use or reproduction without express written consent24 Search by Genomic Location Select species →Select Chromosome →Specify coordinates →Get miRNA list Specify coordinates Click for list of miRNAs Select species Select chromosome Click to open miRNA entry page
Copyright OpenHelix. No use or reproduction without express written consent25 Search for MicroRNA Clusters Select species → Specify inter-microRNA distance → Get clusters Specify distance Click for clusters Select species Cluster 1 Cluster 124 Fetch Sequences Select All Stem-loop or mature seq.; FASTA or ClustalW
Search by Tissue Expression Select species → Select tissue → Get experiments Select tissue Click for experiments Select species References Copyright OpenHelix. No use or reproduction without express written consent26 miRNA link
Copyright OpenHelix. No use or reproduction without express written consent27 Search by Sequence Enter sequence → Set search parameters → Click “Search miRNAs” Click for search results Paste query sequence here CTCTAACACCCCTTCTCCTGGCCAGGTTGG AGTCCCGCCACAGGCCACCAGAGCGGAGC AGCGCAGCGCCCTGTCTCCCAGCCTGAGG TGCAGTGCTGCATCTCTGGTCAGTTGGGAG TCTGAGATGAAGCACTGTAGCTCAGGAAGA GAGAAGTTGTTCTGCAGCCATCAGCCTGGA AGTGGTAAGTGCTGGGGGGTTGTGGGGGG CCATAACAGGAAGGA Browse to locate file
Copyright OpenHelix. No use or reproduction without express written consent28 Search by Sequence – Results Click to miRNA entry page Click to jump to alignment query
Copyright OpenHelix. No use or reproduction without express written consent29 miRBase Agenda Introduction and Credits Basic Search & Results Deep Sequencing Report Advanced Search Options Additional Features Summary Exercises miRBase:
Copyright OpenHelix. No use or reproduction without express written consent30 Browse miRBase by Species Browse tab Retrieve sequences: stem-loop or mature unaligned FASTA or ClustalW alignment species Count
Copyright OpenHelix. No use or reproduction without express written consent31 miRBase Help and Registry
Copyright OpenHelix. No use or reproduction without express written consent32 miRBase Downloading Download tab ftp://mirbase.org/pub/mirbase/CURRENT/ Data available for downloading README file first
Copyright OpenHelix. No use or reproduction without express written consent33 miRBase Downloading Informative articles Post categories Recent comments Recent posts
Copyright OpenHelix. No use or reproduction without express written consent34 miRBase Agenda Introduction and Credits Basic Search & Results Deep Sequencing Report Advanced Search Options Additional Features Summary Exercises miRBase:
Copyright OpenHelix. No use or reproduction without express written consent35 miRBase – Summary miRBase team at the University of Manchester database registry
Copyright OpenHelix. No use or reproduction without express written consent36 miRBase – Summary miRNA Entry Page uagcagcacauaaugguuugug Stem-loop sequence References Links to external resources Mature miRNA(s) Deep sequencing
Copyright OpenHelix. No use or reproduction without express written consent37 miRBase Agenda Introduction and Credits Basic Search & Results Deep Sequencing Report Advanced Search Options Additional Features Summary Exercises miRBase:
Copyright OpenHelix. No use or reproduction without express written consent38