Concepts in Bioinformatics and Genomics

Description

Concepts in Bioinformatics and Genomics takes a conceptual approach to its subject, balancing biology, mathematics, and programming while highlighting relevant real-world applications and providing students with the tools to compute and analyze biological data. It presents many thought-provoking exercises that will stretch students' imaginations and give them a deeper understanding of the molecular biology, basic probability, software programs, and program-coding methodology underpinning this exciting field.

Table of Contents

Preface
About the Author


Chapter I: Review of Molecular Biology

Learning outcomes

1.1 Genes and DNA

1.2 RNA-the intermediary

1.3 Amino acids-the building blocks of proteins

1.4 Levels of protein structure

1.5 The genetic code

1.6 Relative sizes of matter

1.7 DNA alterations

1.8 A case study: sickle cell anemia
· What are the symptoms of sickle cell anemia?
· Sickle cell anemia is the first disease linked to a specific mutation

1.9 Introduction to p53

Summary
`L Exercises
References

Box 1-1. A Closer Look: A rare inherited cancer is caused by mutated Tp53


Chapter 2: Information organization and sequence databases

Learning outcomes

2.1 Introduction

2.2 Public databases

2.3 The header

2.4 The feature keys
· The CDS feature key and gene structure
· The gene feature key and FASTA format
· Thought Question 2.1

2.5 Limitations of GenBank

2.6 Reference Sequence (RefSeq)
· Alternative splicing

2.7 Primary and secondary databases
· The UniProt Knowledge Base (UniProtKB) database

Summary

Exercises
Answers to Thought Questions
References

Box 2-1. Scientist Spotlight: Walter Goad, GenBank Founder
Box 2-2. A Closer Look: GenBank is Critical to the Discovery of the MDM2 Oncoprotein-an Inhibitor of p53


Chapter 3: Molecular Evolution

Learning outcomes

3.1 Introduction

3.2 Conserved regions in proteins

3.3 Molecular Evolution
· Transformation of normal cells to cancer cells
· Are mutations inherited?
· Natural selection
· Mechanisms of mutation

3.4 Ancestral genes and protein evolution

3.5 Modular proteins and protein evolution

Summary
Exercises
References

Box 3-1. Scientist Spotlight: Barbara McClintock


Chapter 4: Substitution matrices

Learning outcomes

4.1 Introduction

4.2 The identity substitution matrix

4.3 An amino acid substitution system based on natural selection

4.4 Development of the matrix of “accepted” amino acid substitutions
· Thought Question 4-1

4.5 Relative mutability calculations

4.6 Development of the PAM1 mutation probability matrix

4.7 Determination of the relative frequencies of amino acids

4.8 Conversion of the PAM1 mutation probability matrix to the PAM1 log-odds substitution matrix

4.9 Conversion of the PAM1 mutational probability matrix to other PAM

4.10 Practical uses for PAM substitution matrices

4.11 The BLOSUM substitution matrix
· Thought Question 4-2

4.12 The physico-chemical properties of amino acids correlate to values in matrices

4.13 Practical usage

Summary
Exercises
Answers to Thought Questions
References

Box 4-1. Scientist Spotlight: Margaret Belle (Oakley) Dayhoff


Chapter 5: Pairwise sequence alignment

Learning outcomes

5.1 Introduction

5.2 Sliding window
· Dot plots
· The Dotter program

5.3 The Needleman-Wunsch global alignment program
· Initialization and matrix fill
· Traceback
· Gap penalties

5.4 Modified Needleman-Wunsch global alignment (N-Wmod) program with linear gap penalty
· N-Wmod initialization
· N-Wmod matrix fill
· N-Wmod traceback

5.5 Ends-free global alignment

5.6 Local alignment algorithm with linear gap penalty

Summary
Exercises
References

Box 5-1. Scientist Spotlight: Christian Wunsch


Chapter 6: Basic Local Alignment Sequence Tool and Multiple Sequence Alignment

Learning outcomes

6.1 Introduction

6.2 The BLAST program
· Four phases in the BLAST program
· How does BLAST account for gaps?
· How is a hit deemed to be statistically significant?
· Thought Question 6-1
· Why is the BLAST program faster than the Smith-Waterman program?
· Low complexity regions and masking
· Usefulness of BLAST
· Psi-BLAST
· Thought Question 6-2

6.3. Multiple Sequence Alignment (MSA)
· CLUSTALW

Summary
Exercises
Answers to Thought Questions
References

Box 6-1. Scientist Spotlight: David Lipman, NCBI Director


Chapter 7: Protein structure prediction

Learning outcomes

7.1 Introduction

7.2 Experimental methods of structure determination
· X-ray crystallography
· NMR spectroscopy

7.3 Information deposited into the Protein Data Bank

7.4 Molecular viewers
· Thought question 7-1

7.5 Protein folding
· Christian Anfisen's protein unfolding and refolding experiment
· Local minimum energy states
· Energy Landscape theory

7.6 Protein structure prediction methods
· Prediction method 1: computational methods
· Combining computational methods and knowledge-based systems
· Calculation of accuracy of structure predictions
· Prediction method 2: statistical and knowledge-based methods
· Prediction method 3: neural networks
· Prediction method 4: homology modeling
· Prediction method 5: Threading
Summary
Exercises
Answers to Thought Questions
References

Box 7-1. A Closer Look: p53 co-crystallized with DNA reveals insights into cancer


Chapter 8: Phylogenetics

Learning outcomes

8.1 Introduction

8.2 Phylogeny and phylogenetics
· Molecular clocks
· Phylogenetic tree nomenclature
· How to tell if sequences in two lineages are undergoing sequence substitution at nearly equal rates?
· DNA, RNA and protein-based trees

8.3 Two classes of tree-generation methods
· Unweighted pair group method with arithmetic mean (UPGMA)
· Thought question 8-1
· Thought question 8-2
· Thought question 8-3
· Thought question 8-4
· Bootstrap analysis
· Other substitution rate models-Kimura two-parameter model and Gamma distance model
· Neighbor-Joining method

8.4 Application of phylogenetics to studies of the origin of modern humans

8.5 Phylogenetic Tree of Life

8.6 The Tp53 gene family members in different species

Summary
Exercises
Answers to Thought Questions
References

Box 8-1. A Closer Look: What do we know about Neanderthal and Denisovan?
Box 8-2. Scientist Spotlight: Svante Pääbo


Chapter 9. Genomics

Learning outcomes

9.1 Introduction

9.2 DNA sequencing-dideoxy method
· Dideoxy nucleotides
· The step-by-step procedure of DNA sequencing
· Electrophoresis
· Thought question 9-1

9.3 Polymerase chain reaction (PCR)

9.4 DNA sequencing-next generation (next-gen) sequencing technologies
· Common themes in next-gen sequencing technologies
· Ion semiconductor sequencing
· Nanoport-based sequencing

9.5 The PhiX174 bacteriophage genome

9.6 The genome of Haemophilus influenzae Rd. and the whole genome shotgun sequencing approach
· The whole genome shotgun approach
· Thought question 9-2
· The Haemophilus influenzae Rd. genome

9.7 Genome assembly and annotation
· Contig N50 and scaffold N50
· Bacterial genome annotation systems

9.8 Genome comparisons
· Synteny Dotplot
· Comparison of E. coli Substrain DH10B to E. coli Substrain MG1655

9.10 The human genome
· General characteristics of the human genome
· Thought question 3
· Detailed analysis of the human genome landscape

9.11 The region of the human genome that encompasses the Tp53 gene
· General comments on the region encoding the Tp53 gene
· Tracks that display information about the Tp53 region of the genome

9.12 The haplotype map
· What is a haplotype?
· Haplotypes can be specified by markers derived from SNPs, indels and CNVs
· Tag SNPs
· Thought question 9-4
· How did haplotypes originate?
· The HapMap database

9.13 Practical application of Tag SNP, SNP and mutation analyses

9.14 What is the smallest genome?

Summary
Exercises
Answers to Thought Questions
References

Box 9-1. Scientist Spotlight: J. Craig Venter
Box 9-2. A Closer Look: DNA Fingerprinting (DNA Profiling)


Chapter 10. Transcript and protein expression analysis

Learning outcomes

10.1 Introduction

10.2 Basic principles of gene expression

10.3 Measurement of transcript levels
· Thought question 10-1

10.4 The transcriptome and microarrays
· Stages of a microarray experiment
· Heatmaps
· Thought question 10-2
· Cluster analysis
· Thought question 3
· Practical applications of microarray data
· Considerations to take in the interpretation of microarray data
· Protein levels can be controlled by regulation of degradation rate

10.5 RNA-seq (RNA sequencing)
· Advantages of RNA-seq
· Overview of RNA-seq steps
· Bridge amplification
· Analysis of an experiment using RNA-seq

10.6 Proteome
· Separation of proteins and quantification of their steady-state levels-two-dimensional (2D) gel electrophoresis
· Identification of proteins-liquid chromatography-mass spectroscopy (LC-MS)
· Advantages and challenges of current proteome analysis techniques

10.7 Regulation of p53-controlled genes

Summary
Exercises
Answers to Thought Questions
References

Box 10-1. Scientist Spotlight: Patrick O. Brown



Chapter 11. Basic probability

Learning outcomes

11.1 Introduction

11. 2 The basics of probability
· Definitions and basic rules
· Counting methods when order matters
· Counting methods when order does not matter
· Independence
· Dependence
· Thought Question 11-1
· Bayesian inference
· Thought Question 11-2

11.3 Random variables
· Discrete random variables
· Thought Question 11-3
· Thought Question 11-4
· Continuous random variables

Summary
Exercises
Answers to Thought Questions
References


Chapter 12. Advanced probability for bioinformatics applications

Learning outcomes

12.1 Introduction

12.2 Extreme value distribution

12.3 Significance of alignments

12.4 Stochastic processes
· Markov chains
· Thought Question 12-1
· Hidden Markov models
· Poisson process and Jukes-Cantor Model

Summary
Exercises
Answers to Thought Questions
References

Box 12-1 Scientist Spotlight: Michael Waterman


Chapter 13. Programming basics and applications to bioinformatics

Learning outcomes

13.1 Introduction

13.2 Developers and users work together to make new discoveries.

13.3 Why Python?

13.4 Getting started with Python

13.5 Data flow: representing and manipulating data
· Variable names
· Data types and operators

13.6 Putting it together-a simple program to lookup the hydrophobicity of an amino acid

13.7 Decision making
· Operations for decision making
· If-tests
· Conditional expressions
· Loops
· Thought Question 13-1
· Thought Question 13-2
· Thought Question 13-3

13.8 Input and output

13.9 Program design: developing Kyte-Doolittle's hydropathy sliding window tool
· Step 1: Understand the problem
· Steps 2 through 4: Develop and refine algorithm
· Step 5: Code in target language (Python)
· Steps 6 and 7: Program verification (testing and debugging)
· Thought Question 13-4

13.10 Hierarchical design: functions and modules
· Python functions
· Thought Question 13.5
· Python modules and packages

Summary
Exercises
Answers to Thought Questions
References

Box 13-1. Scientist Spotlight: Russell F. Doolittle


Chapter 14. Developing a bioinformatics tool

Learning outcomes

14.1 Introduction

14.2 Analysis of an existing tool: EMBOSS water local alignment tool
· Thought question

14.3 Overview of SPA: A simple pairwise alignment tool

14.4 Algorithms

14.5 Algorithms for SPA
· Input sequences
· Create substitution matrix
· Input gap penalties
· Suite of pairwise sequence alignment algorithms
· Output alignment

14.6 Algorithm complexity

14.7 Extensions to simple pairwise alignment tool

Summary
Exercises
Project
Answers to Thought Questions
References

I. Box 14-1. Scientist Spotlight: Richard Karp

Glossary
Index