# Genetics and Genomics

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Category: Science
Slides: 30
Updated: 2026-05-17T20:49:53.455Z
Tags: science, genetics, and, genomics

## Summary

From Mendel's Peas to CRISPR -- The Code of Life Key sections include: Genetics & Genomics; The Central Dogma; Mendelian Genetics; DNA Structure; DNA Replication; Gene Expression; Epigenetics; The Human Genome Project; Mutations and Variation; CRISPR-Cas9 Gene Editing.

## Slide Outline

1. Genetics & Genomics
2. The Central Dogma
3. Mendelian Genetics
4. DNA Structure
5. DNA Replication
6. Gene Expression
7. Epigenetics
8. The Human Genome Project
9. Mutations and Variation
10. CRISPR-Cas9 Gene Editing
11. Genomic Medicine
12. Population Genetics
13. Molecular Clocks and Phylogenetics
14. Gene Therapy
15. Genomics Technologies
16. Cancer Genetics
17. Comparative Genomics
18. Developmental Genetics
19. Genetic Engineering in Agriculture
20. Ethics of Genetic Technology
21. RNA Biology
22. Human Genetic Diversity
23. Synthetic Biology
24. Structural Genomics and Proteomics
25. Microbiome Genetics
26. Genetic Inheritance Patterns
27. Chromosomes and Cell Division
28. Genetic Testing and Counseling
29. Frontiers
30. Summary

## Slide Transcript

### Slide 1: Genetics & Genomics

- From Mendel's Peas to CRISPR -- The Code of Life
- Molecular BiologyDNAHeredityGene Editing

### Slide 2: The Central Dogma

- Information flows from DNA to RNA to protein. This "central dogma" (Crick, 1958) describes the fundamental molecular logic of all life on Earth.
- DNA --[transcription]--> mRNA --[translation]--> Protein
- DNA
- Double-stranded helix storing genetic information in sequences of four nucleotides: adenine (A), thymine (T), guanine (G), cytosine (C). A pairs with T; G pairs with C.
- RNA
- Single-stranded intermediary. mRNA carries gene instructions; tRNA brings amino acids; rRNA forms ribosome structure. Uses uracil (U) instead of thymine.
- Protein
- Chains of amino acids folded into 3D structures that perform virtually all cellular functions: enzymes, structural elements, signaling molecules, transport, defense.

### Slide 3: Mendelian Genetics

- Gregor Mendel (1865) discovered the fundamental laws of inheritance by crossing pea plants -- work ignored for 35 years then rediscovered in 1900.
- Mendel's Laws
- Segregation: Each organism has two alleles per gene; one goes to each gamete
- Independent assortment: Genes on different chromosomes sort independently
- Dominance: One allele may mask the other's phenotypic effect
- Key Terms
- Genotype: Genetic constitution (AA, Aa, aa)
- Phenotype: Observable trait expression
- Homozygous: Two identical alleles (AA or aa)
- Heterozygous: Two different alleles (Aa)
- Allele: Variant form of a gene

### Slide 4: DNA Structure

- "We wish to suggest a structure for the salt of deoxyribose nucleic acid (D.N.A.). This structure has novel features which are of considerable biological interest."Watson and Crick, Nature, April 25, 1953
- The double helix: two antiparallel sugar-phosphate backbones wound around each other, connected by hydrogen-bonded base pairs. The structure immediately suggested the mechanism of replication: separate the strands and copy each one.
- 3.2B
- Base pairs in human genome
- 2 meters
- DNA per cell (stretched)
- 20,000
- Protein-coding genes
- 1.5%
- Genome that codes for protein

### Slide 5: DNA Replication

- Before a cell divides, it must faithfully copy all 3.2 billion base pairs. The process is semi-conservative: each daughter molecule contains one old and one new strand.
- The Machinery
- Helicase unwinds the double helix. Primase lays RNA primers. DNA polymerase III adds nucleotides (5' to 3' only). Ligase seals Okazaki fragments on the lagging strand. Topoisomerase relieves torsional stress.
- Fidelity
- Error rate: ~1 per 10^9 bases after proofreading. DNA polymerase has 3'-5' exonuclease activity (proofreading). Mismatch repair corrects errors that escape proofreading.
- Speed
- ~1000 nucleotides/second in humans. Multiple origins of replication fire simultaneously. Entire genome copied in ~8 hours.
- Telomeres
- Chromosome ends shorten with each division (end-replication problem). Telomerase enzyme maintains telomere length in stem cells and cancer cells. Telomere shortening is linked to aging.

### Slide 6: Gene Expression

- Not all genes are active in every cell. Gene regulation determines which proteins are made, when, where, and in what quantity -- explaining how one genome produces hundreds of distinct cell types.
- Transcription
- RNA polymerase binds promoter region
- Transcription factors recruit/regulate polymerase
- Enhancers/silencers modulate from afar
- mRNA processing: capping, splicing, polyadenylation
- Alternative splicing: one gene produces multiple proteins
- Translation
- Ribosome reads mRNA in codons (3 nucleotides)
- 64 codons specify 20 amino acids + stop signals
- tRNA anticodons match mRNA codons
- Start codon (AUG) initiates every protein
- Post-translational modifications: folding, phosphorylation, glycosylation

### Slide 7: Epigenetics

- Heritable changes in gene expression that do not involve alterations to the DNA sequence itself. The genome's "software layer" that programs cell identity.
- DNA Methylation
- Methyl groups added to cytosine (CpG sites) silence gene expression. Patterns are maintained through cell division. Aberrant methylation contributes to cancer and aging.
- Histone Modification
- Chemical modifications (acetylation, methylation, phosphorylation) of histone tails alter chromatin compaction. Open chromatin = active genes; closed = silent.
- Non-coding RNA
- microRNAs, lncRNAs, and other non-coding transcripts regulate gene expression post-transcriptionally. The "dark matter" of the genome is functionally rich.
- Environmental Influence
- Diet, stress, toxins, and early-life experience can alter epigenetic marks. Some changes are transgenerationally heritable (controversial in mammals, clear in plants and worms).

### Slide 8: The Human Genome Project

- A 13-year international effort (1990-2003) to sequence all 3.2 billion base pairs of human DNA. One of the largest coordinated biological research projects in history.
- Key Findings
- Only ~20,000 protein-coding genes (far fewer than expected)
- ~50% of genome is transposable elements (mobile DNA)
- Humans are 99.9% genetically identical to each other
- Gene number does not correlate with organism complexity
- Vast non-coding regions have regulatory functions
- Impact
- Cost dropped from $3 billion to under $200
- Enabled GWAS (genome-wide association studies)
- Foundation for personalized medicine
- Spawned ENCODE, 1000 Genomes, UK Biobank
- Transformed biology into a data science

### Slide 9: Mutations and Variation

- Mutations are changes in DNA sequence -- the ultimate source of all genetic variation and the raw material for evolution.
- Point Mutations
- Single base changes. Synonymous (silent), missense (different amino acid), nonsense (premature stop). Sickle cell disease: a single A-to-T change in the beta-globin gene.
- Insertions/Deletions
- Added or removed bases. Frameshifts (if not multiples of 3) disrupt the entire downstream reading frame. Cystic fibrosis: deletion of 3 bases removes one phenylalanine.
- Structural Variants
- Large-scale: duplications, inversions, translocations, copy number variants. Affect thousands to millions of bases. Important in cancer and evolutionary adaptation.
- SNPs
- Single nucleotide polymorphisms: common variants (>1% frequency) scattered across the genome (~4-5 million per person vs. reference). Most are neutral; some influence disease risk and drug response.

### Slide 10: CRISPR-Cas9 Gene Editing

- "CRISPR is not just a tool; it's a completely new way to think about biology."Jennifer Doudna, Nobel Laureate 2020
- A revolutionary gene-editing technology adapted from bacterial immune systems. A guide RNA directs the Cas9 protein to a specific genomic location, where it creates a double-strand break that can be repaired to introduce desired changes.
- How It Works
- 1) Design 20-nucleotide guide RNA matching target. 2) Cas9 binds and cuts both DNA strands. 3) Cell repair machinery either disrupts the gene (NHEJ) or inserts new sequence (HDR with template).
- Applications
- Gene therapy (sickle cell cure approved 2023), crop improvement, disease modeling, gene drives for pest control, diagnostics, functional genomics screens.
- Limitations
- Off-target cuts, delivery challenges for in vivo therapy, low HDR efficiency, large insertions difficult, immune response to Cas9. Next-gen editors (base editors, prime editors) address some limitations.

### Slide 11: Genomic Medicine

- The promise of using individual genetic information to tailor prevention, diagnosis, and treatment of disease.
- Pharmacogenomics
- Genetic variants affect drug metabolism. CYP2D6 variants determine codeine response (poor vs. ultra-rapid metabolizers). FDA labels now include genetic information for 300+ drugs.
- Cancer Genomics
- Tumor sequencing identifies driver mutations and guides targeted therapy. HER2+ breast cancer (trastuzumab), BRAF V600E melanoma (vemurafenib), EGFR lung cancer (osimertinib).
- Rare Disease Diagnosis
- Whole exome/genome sequencing ends diagnostic odysseys for Mendelian disorders. ~30% of undiagnosed patients receive a molecular diagnosis, often changing management.
- Polygenic Risk Scores
- Combining thousands of weak-effect variants to predict disease risk (heart disease, diabetes, cancer). Useful for population stratification but limited for individual prediction.

### Slide 12: Population Genetics

- How genetic variation is distributed within and between populations, and how evolutionary forces shape allele frequencies over time.
- Evolutionary Forces
- Natural selection: Differential survival/reproduction based on genotype
- Genetic drift: Random fluctuations, strongest in small populations
- Gene flow: Migration introduces alleles between populations
- Mutation: Introduces new variants at low rate
- Non-random mating: Assortative mating, inbreeding
- Hardy-Weinberg Equilibrium
- In an idealized population (no selection, drift, migration, mutation, or non-random mating), allele and genotype frequencies remain constant across generations.
- p^2 + 2pq + q^2 = 1
- Deviation from HWE indicates evolutionary forces are acting -- a diagnostic tool for identifying selection, population structure, or genotyping errors.

### Slide 13: Molecular Clocks and Phylogenetics

- DNA sequences accumulate mutations at roughly constant rates, allowing us to estimate when species diverged and reconstruct evolutionary trees.
- Molecular Clock
- Neutral mutations accumulate proportional to time. Calibrated against fossil record. Humans and chimps diverged ~6-7 million years ago based on ~1.2% DNA sequence divergence.
- Phylogenomics
- Whole-genome comparisons reconstruct evolutionary relationships with unprecedented resolution. Resolved ancient divergences (archaea, eukaryotes) that morphology alone could not.
- Ancient DNA
- Sequencing DNA from fossils (Neanderthals, Denisovans, mammoths). Revealed interbreeding: 1-4% of modern Eurasian DNA is Neanderthal-derived. Nobel Prize 2022 (Svante Paabo).

### Slide 14: Gene Therapy

- Treating disease by modifying a patient's genes -- a long-sought dream now becoming clinical reality.
- Viral Vectors
- AAV (adeno-associated virus): small, non-integrating, tropism for specific tissues. Lentivirus: integrates permanently, useful for blood disorders. Used in Luxturna (blindness), Zolgensma (SMA).
- Ex Vivo Approaches
- Remove patient's cells, modify them in the lab, return them. CAR-T therapy: T-cells engineered to express chimeric antigen receptors targeting cancer. Remarkable remissions in leukemia/lymphoma.
- In Vivo Gene Editing
- CRISPR delivered directly to the body. Casgevy (2023): first CRISPR therapy approved, cures sickle cell disease and beta-thalassemia by reactivating fetal hemoglobin production.
- Challenges
- Delivery to target tissues, immune responses, durability of expression, off-target effects, manufacturing cost ($1-3 million per treatment), and equitable access.

### Slide 15: Genomics Technologies

- Next-Gen Sequencing
- Illumina short-read: massively parallel, cheap ($200/genome), dominant platform. Reads 150-300 bp fragments; assembly via alignment to reference.
- Long-Read Sequencing
- PacBio (HiFi) and Oxford Nanopore: reads 10-100+ kb. Resolves repeats, structural variants, and methylation directly. Enabled the complete human genome (T2T, 2022) including centromeres and telomeres.
- Single-Cell Genomics
- Sequence individual cells' transcriptomes (scRNA-seq). Reveals cellular heterogeneity within tissues. Mapped all human cell types (Human Cell Atlas). Revolutionary for immunology, neuroscience, cancer.
- Spatial Transcriptomics
- Measures gene expression while preserving spatial context within tissues. Methods like Visium, MERFISH, and Slide-seq map transcripts to specific tissue locations. Method of the Year 2020.

### Slide 16: Cancer Genetics

- Cancer is fundamentally a genetic disease -- caused by accumulation of mutations in oncogenes and tumor suppressors that override normal growth controls.
- Key Concepts
- Oncogenes: Gain-of-function mutations activate growth (RAS, MYC, HER2)
- Tumor suppressors: Loss-of-function removes brakes (TP53, RB, BRCA1)
- Two-hit hypothesis: Both copies must be inactivated (Knudson)
- Hallmarks of cancer: 10 capabilities acquired through mutation
- Tumor heterogeneity: Subclones evolve within a single tumor
- Precision Oncology
- Tumor genome sequencing identifies actionable mutations. Matching patients to targeted therapies based on molecular profile rather than tumor site. Basket trials test drugs across cancer types sharing the same mutation.
- Liquid biopsy: detecting tumor DNA in blood for diagnosis, monitoring, and early detection.

### Slide 17: Comparative Genomics

- Comparing genomes across species reveals evolutionary conservation, functional elements, and the genetic basis of biological diversity.
- 99%
- DNA shared with chimpanzees
- 85%
- DNA shared with mice
- 60%
- DNA shared with bananas
- Conserved non-coding sequences (unchanged across millions of years of evolution) are likely functional -- often regulatory elements controlling gene expression. Some are more conserved than protein-coding genes, suggesting critical roles.

### Slide 18: Developmental Genetics

- How a single fertilized egg develops into a complex organism with hundreds of cell types arranged in precise spatial patterns -- all controlled by differential gene expression.
- Hox Genes
- Master regulators of body plan. Arranged in clusters on chromosomes in the same order as the body segments they control (colinearity). Remarkably conserved from flies to humans.
- Morphogen Gradients
- Signaling molecules (Sonic hedgehog, Wnt, BMP) form concentration gradients. Cells read their position and activate appropriate genes. French Flag model of positional information.
- Stem Cells
- Undifferentiated cells that can self-renew and differentiate into specialized types. Embryonic stem cells are pluripotent. iPSCs (Yamanaka, Nobel 2012) reprogram adult cells back to pluripotency.
- Organoids
- 3D tissue structures grown from stem cells that recapitulate organ architecture. Brain organoids, gut organoids, lung organoids. Revolutionizing drug testing and disease modeling.

### Slide 19: Genetic Engineering in Agriculture

- Genetic modification of crops has dramatically increased yields, reduced pesticide use, and improved nutritional content -- yet remains controversial in many societies.
- Achievements
- Bt crops: built-in insect resistance (corn, cotton)
- Herbicide tolerance: simplified weed management
- Golden Rice: beta-carotene enriched (vitamin A)
- Disease-resistant varieties (papaya, banana)
- Drought tolerance and nitrogen efficiency
- Gene Editing Revolution
- CRISPR enables precise edits without introducing foreign DNA ("cisgenic" modifications). Non-browning mushrooms, high-oleic soybeans, hornless dairy cattle. Many countries regulate gene-edited crops differently from transgenic GMOs.
- Potential for climate adaptation: engineering C4 photosynthesis into rice, perennial grain crops, salt-tolerant varieties.

### Slide 20: Ethics of Genetic Technology

- Powerful genetic technologies raise profound ethical questions about human identity, equity, consent, and the boundaries of intervention.
- Germline Editing
- He Jiankui's 2018 creation of CRISPR-edited babies (CCR5 deletion) was universally condemned as premature and unsafe. International moratorium on clinical germline editing remains in place.
- Genetic Privacy
- Direct-to-consumer testing (23andMe), forensic genealogy (Golden State Killer), and employer/insurer access to genetic data raise privacy concerns. GINA protects against discrimination in the US.
- Equity and Access
- Gene therapies costing $1-3 million per patient. Who benefits? Genomic databases over-represent European ancestry, reducing utility for diverse populations.
- Enhancement vs. Therapy
- Where is the line between treating disease and enhancing normal traits? Intelligence, physical performance, longevity -- should genetic enhancement be permitted?

### Slide 21: RNA Biology

- RNA is far more than a passive messenger. The "RNA world" hypothesis suggests RNA preceded both DNA and protein in the origin of life.
- mRNA Therapeutics
- COVID-19 vaccines (Pfizer, Moderna) proved mRNA can be a therapeutic platform. Now being developed for cancer vaccines, rare diseases, and protein replacement therapies.
- RNA Interference
- Small interfering RNAs (siRNAs) silence specific genes post-transcriptionally. FDA-approved drugs: patisiran (hereditary amyloidosis), inclisiran (cholesterol). Nobel Prize 2006.
- Non-coding RNAs
- lncRNAs, circRNAs, piRNAs -- thousands of functional RNA species that do not encode proteins. Regulate chromatin structure, mRNA stability, translation, and development.
- Ribozymes
- RNA molecules with catalytic activity. The ribosome itself is a ribozyme -- peptide bond formation is catalyzed by ribosomal RNA, not protein. Supports RNA World hypothesis.

### Slide 22: Human Genetic Diversity

- Modern humans originated in Africa ~300,000 years ago. Our genetic diversity reflects migration patterns, bottlenecks, admixture, and adaptation to local environments.
- Key Patterns
- Greatest diversity in Africa (longest evolutionary history)
- Out-of-Africa bottleneck reduced diversity in other populations
- Local adaptations: skin color, altitude tolerance, lactase persistence
- Archaic admixture: Neanderthal and Denisovan DNA in modern humans
- Race and Genetics
- Genetic variation between human populations is continuous and clinal, not discrete. "Race" as traditionally defined does not correspond to meaningful genetic boundaries. Within-group variation (85-95%) vastly exceeds between-group variation (5-15%).

### Slide 23: Synthetic Biology

- Engineering biology with the same rigor as engineering -- designing and building new biological parts, devices, and systems from scratch.
- Synthetic Genomes
- Craig Venter's team synthesized an entire bacterial genome (Mycoplasma mycoides, 2010) and "booted it up" in a cell. First organism with a fully synthetic genome. Minimal genome project identified ~470 essential genes.
- Genetic Circuits
- Boolean logic gates, oscillators, and switches built from biological parts. Toggle switches, repressilators, and genetic timers. Programming cells like computers.
- Metabolic Engineering
- Rewiring cellular metabolism to produce valuable chemicals: artemisinin (antimalarial), biofuels, spider silk, industrial enzymes. Organisms as chemical factories.
- Xenobiology
- Expanding the genetic alphabet beyond A/T/G/C. Synthetic base pairs (X/Y) incorporated into living organisms. Toward truly artificial life with unnatural building blocks.

### Slide 24: Structural Genomics and Proteomics

- Understanding the three-dimensional structure of proteins -- the functional products of genes -- is essential for drug development, disease understanding, and synthetic biology.
- AlphaFold Revolution
- DeepMind's AlphaFold2 (2021) predicts protein 3D structure from amino acid sequence with near-experimental accuracy. The AlphaFold Protein Structure Database now contains structures for essentially all known proteins (~200 million). Called the most important scientific achievement in decades.
- Cryo-Electron Microscopy
- Cryo-EM rapidly determines protein structures without crystallization. Transformed structural biology: can image large complexes, membrane proteins, and heterogeneous samples. Nobel Prize 2017. Now routinely achieves sub-2 angstrom resolution.
- Proteomics
- Mass spectrometry identifies and quantifies thousands of proteins simultaneously. Single-cell proteomics, structural proteomics, and interaction networks (interactome) map the full protein landscape of a cell. Complementary to transcriptomics -- mRNA levels correlate imperfectly with protein abundance.
- Drug Discovery
- Structure-based drug design uses protein structures to design molecules that fit active sites precisely. AlphaFold accelerates this enormously. AI models now predict protein-drug interactions, protein-protein interactions, and antibody design.

### Slide 25: Microbiome Genetics

- The trillions of microorganisms inhabiting the human body carry 100 times more genes than the human genome itself. Metagenomics sequences all of this genetic material simultaneously.
- Metagenomics
- Shotgun sequencing of environmental DNA without culturing. Revealed that 99% of microbial life cannot be grown in a laboratory. Transformed our understanding of microbial diversity in soil, ocean, and the human gut.
- Gut Microbiome
- ~38 trillion bacteria, 1,000+ species, 3+ million genes. Influences metabolism, immune function, mental health, and drug response. Disruption (dysbiosis) linked to obesity, inflammatory bowel disease, and depression.
- Horizontal Gene Transfer
- Bacteria swap genes between species -- including antibiotic resistance genes. Not limited by sexual reproduction. Means bacterial evolution can occur on timescales of hours to days.
- Phage Therapy
- Bacteriophages (viruses infecting bacteria) can be sequenced, engineered, and used as precision antibiotics. Especially promising for drug-resistant infections unresponsive to conventional treatment.

### Slide 26: Genetic Inheritance Patterns

- Beyond Mendel's simple dominant/recessive model, many inheritance patterns produce complex phenotypic outcomes that require understanding of molecular mechanisms.
- Non-Mendelian Inheritance
- Codominance: Both alleles expressed (ABO blood type)
- Incomplete dominance: Heterozygote intermediate (snapdragon color)
- Pleiotropy: One gene affects multiple traits (sickle cell)
- Epistasis: One gene masks another's expression
- Genomic imprinting: Parent-of-origin matters (Prader-Willi, Angelman)
- Sex-Linked Traits
- Genes on the X or Y chromosome show distinctive inheritance patterns. X-linked recessive traits (hemophilia, color blindness) manifest more often in males who lack a second X chromosome to compensate. The Lyon hypothesis: one X is randomly inactivated in each female cell, creating mosaics.

### Slide 27: Chromosomes and Cell Division

- Human cells carry 46 chromosomes (23 pairs). Proper chromosome segregation during cell division is essential; errors cause aneuploidy and are a leading cause of miscarriage and developmental disorders.
- Mitosis
- Cell division producing two genetically identical daughter cells. Essential for growth and tissue repair. Five stages: prophase, metaphase, anaphase, telophase, cytokinesis. Spindle checkpoint prevents premature anaphase.
- Meiosis
- Specialized division producing four haploid gametes with shuffled genetics. Crossing over during meiosis I creates new allele combinations. Essential for sexual reproduction and a major source of genetic diversity.
- Chromosomal Abnormalities
- Trisomy 21 (Down syndrome), Trisomy 18 (Edwards), Turner syndrome (45,X), Klinefelter syndrome (47,XXY). Most arise from non-disjunction during meiosis. Prevalence increases with maternal age.
- Karyotyping and FISH
- Chromosome analysis by light microscopy (karyotype) and fluorescent probes (FISH). Can detect large rearrangements, deletions, and aneuploidies. Chromosomal microarrays detect copy number variants at kilobase resolution.

### Slide 28: Genetic Testing and Counseling

- Genetic testing has expanded from rare inherited conditions to population-scale screening, raising profound questions about information, consent, and action.
- Testing Types
- Diagnostic: Confirm suspected genetic disorder
- Predictive: Assess risk before symptoms (BRCA1/2)
- Carrier: Identify heterozygotes who may pass on recessive conditions
- Prenatal: Amniocentesis, CVS, cell-free fetal DNA (NIPT)
- Newborn: Population screening for 50+ conditions (PKU, SMA)
- Genetic Counseling
- Genetic counselors help patients understand complex probabilistic information, make decisions about testing and treatment, and cope with implications for themselves and family members. The field grapples with the "right not to know," duty to warn relatives, and the psychological burden of risk information.

### Slide 29: Frontiers

- Pangenomics
- Moving beyond a single reference genome to capture all human genetic variation. The human pangenome (2023) includes 47 diverse individuals, representing sequences missing from GRCh38.
- Epigenome Editing
- Precisely modifying epigenetic marks without changing DNA sequence. CRISPRoff/on for durable gene silencing/activation. Potential for diseases driven by gene dysregulation.
- Base and Prime Editing
- Beyond CRISPR cutting: base editors change single letters without double-strand breaks. Prime editors perform "search and replace" edits. More precise, fewer unwanted mutations.
- Gene Drives
- Selfish genetic elements that spread through populations faster than Mendelian inheritance. Could eliminate malaria mosquitoes or invasive species. Profound ecological and ethical concerns.
- AI for Genomics
- AlphaFold (protein structure prediction), DeepVariant (variant calling), DNA language models. AI is accelerating every aspect of genomics from sequence interpretation to drug discovery.
- Longevity Genetics
- Identifying genes that influence aging. Centenarian studies, telomere biology, senolytic drugs, and genetic interventions that extend lifespan in model organisms. Translation to humans is the frontier.

### Slide 30: Summary

- Genetics and genomics have transformed from a descriptive science of inheritance into a powerful engineering discipline capable of reading, writing, and editing the code of life.
- Reading the Code
- From Sanger sequencing (1977) to $200 whole genomes. We can now read any organism's genetic instructions completely and cheaply.
- Writing the Code
- Synthetic biology enables de novo design of genes, circuits, and entire genomes. Engineering life with unprecedented precision and creativity.
- Editing the Code
- CRISPR and next-generation editors allow precise modifications in living organisms. Gene therapy is curing previously incurable diseases. The future is one of radical capability -- and radical responsibility.


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