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Published byJennifer Bryant Modified over 7 years ago
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An introduction to gene prediction
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Content Introduction Prokaryotes Start/stop, operons Eukaryotes Start/stop promoter/polyA Intron/exons/UTR Problems Pseudogenes Alternative splicing RNA genes Repeats/CpG island Methods HMMs Neural networks Compositional bias Syntheny Programs
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Signals in Prokaryotes Transcription start/stop -35 Region TATA box Translation start/stop ORFs Shine-Delgarno motif Start ATG/GTG Stop TAA/TAG/TGA Stem-loops Operons Few special cases Introns, inteins, slipering
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Signals in Eukaryotes Transcription Promoter/enhancer/silencer TATA box Introns/exons Donor/acceptor/branch polyA Repeats Alu, Satellites, Expansions CpG islands Cap/CCAAT&GC boxes Translation 5’ and 3’ UTR Kozak consensus Start ATG Stop TAA/TAG/TGA
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Eukaryotes central dogma
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Promoters/enhancers/silencers
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Intron/exons splicing Consensus Donor (A,C)AG/GT(A,G)AGT Acceptor TTTTTNCAG/GCCCCC Branch CT(G,A)A(C,T)
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Alternative splicing
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Pseudogenes Promoters loss, stop codons, frameshifts Translocation, duplication
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RNA genes and other problems rRNA (ribosome) tRNA (transfert) snRNA (splicing) tmRNA (telomerase) Repeats (Alu, satellites, expansion etc…) CpG islands
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Methods Signals Statistics (compositional bias) HMMs Neural networks Homology/Syntheny
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Programs See Lorenzo Cerutti presentation
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