1. Genomics, Proteomics, and Bioinformatics Biology 224 Instructor: Tom Peavy January 29, 2008

2. Interface of biology and computers Analysis of genomes, genes, mRNA and proteins using computer algorithms and computer databases What is bioinformatics?

3. What is Genomics? What is Proteomics? What is the Transcriptome?

4. What do you want out of this course?

5. Top ten challenges for bioinformatics [1] Precise models of where and when transcription will occur in a genome (initiation and termination) [2] Precise, predictive models of alternative RNA splicing [3] Precise models of biological pathways; ability to predict cellular responses to external stimuli [4] Determining protein:DNA, protein:RNA, protein:protein recognition codes [5] Accurate ab initio protein structure prediction

6. Top ten challenges for bioinformatics [6] Rational design of small molecule inhibitors of proteins [7] Mechanistic understanding of protein evolution [8] Mechanistic understanding of speciation [9] Development of effective gene ontologies: systematic ways to describe gene and protein function [10] Education: development of bioinformatics curricula Source: Ewan Birney, Chris Burge, Jim Fickett

7. Themes throughout the course: gene/protein families Retinol-binding protein 4 (RBP4)  member of the lipocalin family  small, abundant carrier protein We will study it in a variety of contexts including --homologs in various species --sequence alignment --gene expression --protein structure --phylogeny

9. Tool-users Tool-makers bioinformatics public health informatics medical informatics infrastructure databases algorithms

10. DNARNA cDNA ESTs UniGene phenotype genomic DNA databases protein sequence databases protein

11. GenBankEMBLDDBJ Housed at EBI European Bioinformatics Institute There are three major public DNA databases Housed at NCBI National Center for Biotechnology Information Housed in Japan

12. Growth of GenBank Year Base pairs of DNA (billions) Sequences (millions) Updated 8-12-04: >40b base pairs 198219861990199419982002

13. Press Release (August 22, 2005)  100 gigabases of sequence data (NCBI, EMBL, & DDBJ)  over 165,000 organisms

14. The growth of GenBank. The blue area shows the total number of bases including those from whole genome shotgun sequencing projects (WGS). The checkered area shows only the non-WGS portion. With release 149, the number of WGS bases exceeded the number of bases in the traditional GenBank divisions.

15. Go to NCBI website http://www.ncbi.nlm.nih.gov/

16. PubMed is… National Library of Medicine's search service 12 million citations in MEDLINE links to participating online journals PubMed tutorial (via “Education” on side bar)

17. Entrez integrates… the scientific literature; DNA and protein sequence databases; 3D protein structure data; population study data sets; assemblies of complete genomes

18. Entrez is a search and retrieval system that integrates NCBI databases

19. BLAST is… Basic Local Alignment Search Tool NCBI's sequence similarity search tool supports analysis of DNA and protein databases 80,000 searches per day

20. OMIM is… Online Mendelian Inheritance in Man catalog of human genes and genetic disorders edited by Dr. Victor McKusick, others at JHU

21. Books is… searchable resource of on-line books

22. TaxBrowser is… browser for the major divisions of living organisms (archaea, bacteria, eukaryota, viruses) taxonomy information such as genetic codes molecular data on extinct organisms

23. Structure site includes… Molecular Modelling Database (MMDB) biopolymer structures obtained from the Protein Data Bank (PDB) Cn3D (a 3D-structure viewer) vector alignment search tool (VAST)

24. Review of Genetics, Biochemistry & Evolution

25. Human Genome Project

26. What is a typical Genomic structure for a Eukaryotic gene?

30. Synonymous vs. nonsynonymous changes

31. Synonymous Substitution Non-synonymous Substitution

32. Central Dogma DNA  RNA  protein sequence  structure  function  evolution

33. What kind of modifications Are made to Eukaryotic mRNAs?

34. RNA Modifications

37. What are cDNAs?

38. Protein structures X-ray crystallography and Nuclear magnetic resonance (NMR) Primary structure – linear AA Secondary structure- –alpha helix and beta sheet Tertiary structures- –3-d that exposes binding domains etc

40. Linkage maps YAC Yeast artificial chromosome & BAC Bacterial artificial chromosome -used to clone large pieces of DNA -overlapping clones Are genes linked?

41. Organization of genomes Groups of genes within a species -Comparative Genomics plastid genomes and mt genomes

43. How do we determine functions of genes?

44. Expression patterns –Northerns –RT-PCR –SAGE –Microarrays Transgenics –insert genes what results? Mutants –classical genetics –molecular genetics And Functional Protein Assays

45. Charles Darwin Descent with modification –species change through time and are related to a common ancestor Natural Selection is the process by which this change occurs

46. Understanding Natural selection acts on individuals though consequences occur in populations –Individual’s phenotype reason survived and reproduced –after a time this will change the distribution in the population, –what ultimately changes? Gene pool

47. New alleles Point change is all needed –not always a "big deal" neutral change –can be in Sickle cell anemia

48. Gene duplication creates an additional copy of a gene –unequal cross-over –X-rays Are these duplicates maintained in populations? –Psuedogenes

50. Polyploidy additional set of chromosomes –Found in plants –Amphibians, invertebrates Through a type of parthenogenesis –Triploid Poor fertility Hybridization or meiosis malfunction

51. Homology study of likeness (literal) Similarity between species (or genes) that results from inheritance of traits from a common ancestor –Unless know of a common ancestor have to be careful when using this word.

52. Orthologous vs Paralogous Genes        Gene Duplication Speciation Species 1 Species 2

53. Species All organisms alive today can trace their ancestry back to the origin of life some 3.8 billion years ago –Since then millions if not billions of branching events have occurred Mechanisms have to be in place for change to occur –genetic drift and natural selection