Maarg Manthan · Topic 10.2

Genomics and Proteomics

Science & Technology › Biotechnology – Principles and Techniques · Topic 10.2

Genomics is the study of the complete set of genes, called the genome, of an organism, including how the genes are arranged, copied and controlled. Proteomics is the large-scale study of all the proteins made by a cell or organism, called the proteome, including their structures, amounts, modifications and interactions. A genome is nearly fixed for an individual, but the proteome changes with tissue, time and disease, which makes proteins a closer sign of what a cell is doing. The Human Genome Project, completed in 2003, gave the human reference sequence and opened the way to precision medicine, crop improvement and disease tracking.

5 min read · UPSC Prelims · Science & Technology · Biotechnology – Principles and Techniques

At a Glance

Genomics Study of all genes
Proteomics Study of all proteins
Key project Human Genome Project, 2003
Key tools Sequencers and mass spectrometry
Link Precision medicine
Exam link UPSC Prelims, Science & Technology: Biotechnology – Principles and Techniques

Where Does It Fit?

This topic follows genetic engineering. Having learnt how single genes are moved, the student now moves to reading all genes and all proteins together. Previous topic: Recombinant DNA technology Cutting tool Restriction enzymes Joining tool DNA ligase Carriers Plasmids and other vectors India…">Genetic Engineering: Procedure and Applications. Next topic: Types of RNA and Their Technological Applications.

How Are Genomics and Proteomics Different?

Feature	Genomics and proteomics
What is studied	Genomics studies the DNA of an organism. Proteomics studies all its proteins
Stability	The genome is almost the same in all cells of a person. The proteome differs by cell type, time and disease
Main techniques	Genomics uses DNA sequencing and microarrays. Proteomics uses two-dimensional gel electrophoresis, mass spectrometry and protein arrays
Branches	Structural, functional and comparative genomics. Expression, structural and interaction proteomics
Data handling	Both depend on bioinformatics, which uses computers to store and compare sequences and structures
Output	Gene maps, variants and sequences versus protein lists, amounts and modifications

What Are the Main Uses?

Medicine: finding gene variants linked to disease, tumour profiling and choice of drug
Biomarkers: proteins in blood or tissue that signal a disease, used for early diagnosis
Drug discovery: proteomics finds the protein targets of drugs and shows side effects
Agriculture: genomes of rice, wheat and other crops help breeders select for yield, stress tolerance and quality
Infectious disease: genome sequencing of viruses and bacteria tracks variants and drug resistance
Evolution and conservation: comparing genomes shows relationships between species and the diversity within populations
Forensics and ancestry: DNA profiles identify people and trace migrations
Nutrition and microbiome: studies of gut microbes and food proteins link diet to health

What Else Should You Remember?

Human Genome Project: an international project from 1990 that was completed in 2003. It found roughly 20,000 to 25,000 protein coding genes and about 3 billion base pairs. A gap-free sequence was reported later by the Telomere-to-Telomere consortium
Other omics: transcriptomics studies RNA, metabolomics studies small molecules, and epigenomics studies chemical marks on DNA
Metagenomics: sequencing DNA from a whole community of microbes, such as soil or gut
GenomeIndia: an Indian project of the Department of Biotechnology to sequence the genomes of thousands of people from diverse populations to build a reference database. Check the latest figures before quoting
Pharmacogenomics: use of genome data to predict drug response, as in Pharmacogenetics
Sequencing: reading the order of bases, as in Genome Sequencing and Its Practical Uses
Privacy: genome data is sensitive and needs consent and security
Gap: mapping all genes is easier than understanding how genes and proteins work together, which is the aim of systems biology
Microarrays: glass slides with thousands of DNA spots used to measure which genes are active at the same time
Protein structure: methods such as X-ray crystallography, nuclear magnetic resonance and cryo-electron microscopy show the three dimensional shape of proteins, and AlphaFold, a computer programme, predicts shapes from sequences
Post-translational changes: proteins are altered after they are made, for example by adding phosphate groups, so one gene can give many protein forms
Interactome: the map of all the interactions between proteins in a cell
Exam angle: questions often ask which omics field answers which question, for example proteomics for biomarkers in blood
Transcriptome: the full set of RNA made in a cell at a given time, studied by RNA sequencing to see which genes are switched on
Why proteins matter: most drugs act on proteins, so proteomics links genetic information to treatment

Why Does It Matter for the Exam?

Definitions: genome, proteome, omics
Techniques: mass spectrometry is for proteins, sequencing is for DNA
Projects: Human Genome Project and GenomeIndia
Current affairs link: new reference genomes, rare disease programmes and sequencing of pathogens
Common errors: saying that the proteome is fixed or that genomics studies proteins

As an analytical point, genome data becomes useful only when linked to health and trait records. Strong privacy rules and diverse Indian reference data are needed so that benefits reach all groups.

Why Is This Topic Important?

Concepts Genome versus proteome
Projects HGP and GenomeIndia
Applications Precision medicine

What Came Next?

The next topic covers the different types of RNA and how they are used. Next topic: Types of RNA and Their Technological Applications.

Key People and Terms

Genome All genes of an organism
Proteome All proteins of a cell
Bioinformatics Computing on biological data
Biomarker Measurable sign of disease
Omics Large-scale study of a type of molecule
Mass spectrometry Identifies proteins by mass

Exam Corner

Points to Remember

Human Genome Project completed: 2003.
Proteome changes; genome is stable.
Protein tool: mass spectrometry.
About 3 billion base pairs in the human genome.
GenomeIndia: DBT project.

Do Not Confuse With

Genomics and genetics All genes versus single gene inheritance
Genome and gene Whole set versus one unit
Proteomics and metabolomics Proteins versus small molecules

Memory Hook

Genome is the script, proteome is the performance; the script stays, the show changes.

Mains Angle

Questions ask about uses and ethics. These points give both.

Uses Medicine and farming
Challenges Privacy and cost
India Reference data

A Question You May Face

An original practice question, not a past paper question.

“Discuss the importance of genomics and proteomics in health care and agriculture, and the issues that arise from large genome databases.”

How to Answer

Meaning Genome and proteome.
Uses Medicine, crops.
Issues Privacy and equity.
Way Safeguards and access.

GS Relevance

Prelims: genome, proteome, tools, Human Genome Project, applications. GS Paper 3: science and technology, biotechnology, health.

Frequently Asked Questions

What is the difference between genomics and proteomics?

Genomics studies the complete set of genes in an organism, while proteomics studies the complete set of proteins. The genome is almost constant, but the proteome varies between cells, over time and in disease, so proteomics shows what a cell is actually doing at a given moment.

What was the Human Genome Project?

The Human Genome Project was an international effort that began in 1990 and was completed in 2003 to read the full sequence of human DNA. It found about 3 billion base pairs and roughly 20,000 to 25,000 protein coding genes, and it created the reference for modern genomic medicine.

Which technique is used to identify proteins?

Mass spectrometry is the main technique for identifying and measuring proteins in a sample. It measures the mass of protein fragments and compares them with databases. Two-dimensional gel electrophoresis is an older method that separates proteins by charge and size before identification.

What is a biomarker?

A biomarker is a measurable substance or feature, such as a protein or gene variant, that signals a normal or disease process in the body. Proteomics and genomics help to find biomarkers for early diagnosis of cancer, heart disease and infections, and to monitor how patients respond to treatment.

What is bioinformatics?

Bioinformatics is the use of computer methods to store, search and analyse biological data such as DNA sequences and protein structures. Genomics and proteomics produce very large data sets, so bioinformatics is needed to find genes, compare species and link variants to disease.

PYQ Practice — Statement Analysis

1 The proteome of a person is the same in all cells and at all times.

False

The proteome varies.

2 The Human Genome Project was completed in 2003.

True

After starting in 1990.

3 Mass spectrometry is a main tool of proteomics.