CRISPR Cas System: 8+ hours From DNA Basics to Gene Editing

Explore the CRISPR-Cas immune system, where bacteria store viral DNA as spacers in a mugshot library and employ Cas proteins to cut invader DNA or RNA.

Explore the Cas protein toolbox, including Cas9, Cas12, and Cas13, and learn how DNA editing with blunt or staggered cuts and RNA targeting enable diagnostics and reversible gene regulation.

Explore how PAM sequences guide CRISPR-Cas edits, enabling precise, safe DNA targeting. Learn Cas9, Cas12a, and Cas13 PAM differences, and how engineered variants expand editing reach.

Explore how CRISPR acts as an adaptive immune system in bacteria, with adaptation, expression, and interference that remember invaders and guide precise gene editing tools.

Engage in an interactive quiz to master crispr basics, including spacers as memory snapshots, RNA-targeting Cas13, DNA-targeting Cas9, PAM requirements, the three-phase immune response, and Cas12 collateral cleavage enabling diagnostics.

CRISPR-Cas9 democratizes gene editing by delivering fast, affordable, and precise edits across medicine, agriculture, and biotechnology, enabling cures for genetic diseases, drought- and disease-resistant crops, and innovative bioengineering.

Explore the CRISPR-Cas9 system, where Cas9 acts as molecular scissors guided by guide RNA to precise DNA targets, with PAM sequences signaling where to cut.

Guide RNA directs Cas9 to the matching DNA sequence; PAM confirms the target, Cas9 cuts the DNA, and cellular repair via NHEJ or HDR yields knockout or precise edits.

Explore non-homologous end joining, the cell's quick, template-free repair that glues breaks and creates indels to knock out genes fast, though error-prone and not suitable for precise edits.

Explore how HDR uses a DNA template to repair breaks with precision, enabling mutation correction and gene insertion, and how it contrasts with fast, error-prone NHEJ.

Explore CRISPR-Cas9 components, including guide RNA and Pam sequence, compare editing pathways like non-homologous end joining and HDR, and learn when to use precise versus rapid gene edits.

Learn why Cas9 variants exist to reduce off-target effects, expand target range, and ease delivery. Discover nickase, high fidelity, novel PAM, and ortholog variants and how they address these limits.

Cas9 nickase uses a single-strand cut with paired nickases for higher precision and safety, enabling base editing and therapeutic research while reducing off-target effects.

Explore how engineered high fidelity Cas9 variants reduce off target effects by tuning amino acids, enabling Cas9 to bind only to intended DNA for safer gene therapy.

Expand crispr editing with cas9 variants that recognize novel pam specificities, enabling access to previously untargetable regions for therapeutics, functional genomics, and gene-editing applications.

Explore Cas9 orthologs, naturally occurring enzymes from different bacteria with smaller size and different PAM recognition, expanding the Crispr toolbox for in vivo gene therapy and multiplex editing.

Explore Cas9 variants through real-world scenarios, addressing PAM limitations, off-targets, and delivery challenges. Learn strategies like paired nickases, high-fidelity variants, and smaller Cas9 orthologs for in vivo gene therapy.

Explore how engineered viral vectors deliver CRISPR components into target cells, overcoming delivery barriers. Learn about adenoviral, AAV, and lentiviral vectors, their integration or transient expression, and in vivo applications.

Use adenoviral vectors as non-replicating delivery trucks carrying CRISPR components for transient expression. Choose all-in-one or separate vector strategies, noting immunogenicity and production complexity.

Explore adeno-associated viral vectors as non-pathogenic CRISPR delivery tools for liver, muscle, and brain, with a 4.7 kb payload limit and options to split cargo or use smaller Cas9 variants.

Lentiviral vectors deliver CRISPR components via replication-defective virus that integrates into the genome for long-term expression in dividing and non-dividing cells. Leverage large cargo capacity while addressing biosafety concerns.

Explore how viral vectors enable CRISPR delivery by comparing AAV, adenovirus, and lentivirus for transient versus permanent expression, tissue targeting, cargo limits, and immune considerations.

Explore how gRNA guides Cas9 to target DNA with crRNA and tracrRNA. Apply PAM requirements, 20-nucleotide targets, GC content 40–60%, and accessibility to optimize edits and reduce off-targets.

Learn the causes of off-target effects in CRISPR Cas9 and mitigation strategies such as high-fidelity Cas9 variants, truncated gRNAs, and dual nicking for safer, more precise gene editing.

Base editing uses a Cas9 nickase and deaminase to convert single DNA bases without double-strand breaks, enabling cytosine base editors and adenine base editors to edit targeted bases.

Prime editing uses a Cas9 nickase, reverse transcriptase, and Peg RNA to rewrite DNA without double-strand breaks, enabling precise base substitutions and small insertions or deletions.

Engage in a quiz that explains crRNA guiding Cas9, the PAM requirement, and optimal target features, while exploring base editing, prime editing, and high-fidelity strategies to reduce off-target effects.

Explore crispr activation (crispr a) to turn on target gene expression using dead cas9 fused to transcriptional activators, delivered to cells, and applied in research, drug discovery, and gene therapy.

Use crispr interference to silence gene expression by guiding dCas9 to promoters or coding regions, blocking transcription and possibly recruiting repressive domains, enabling gene function studies and disease modeling.

Explore epigenetic editing with dCas9 to modulate gene expression without cutting DNA, by adding or removing epigenetic marks like DNA methylation and histone modifications.

Answer questions on CRISPR activation and interference using dCas9 fusions, and learn how epigenetic editing with a DNA demethylase can reactivate gene expression.

Identify how a single Hbb gene mutation causes sickle cell disease and how CRISPR-Cas9 edits patient hematopoietic stem cells ex vivo to restore healthy hemoglobin, with real clinical trial progress.

Discover how Crispr targets the Cftr gene to correct the delta F508 mutation in cystic fibrosis, using ex vivo patient-derived airway stem cells or in vivo delivery to lung tissue.

Learn how CRISPR targets HIV by blocking the CCR5 receptor or excising proviral DNA, with ex vivo T cell editing and preclinical challenges like viral escape and safety.

Engage with interactive scenarios to apply gene editing, exploring sickle cell disease from a single point mutation in the HBB gene, CRISPR Cas9 editing, delta f508 mutation, and CCR5.

Explore how CRISPR diagnostics use Cas12 and Cas13 as highly specific molecular sensors to detect DNA or RNA from viruses, bacteria, and mutations, with rapid, portable readouts.

Explore CRISPR-based diagnostics with Cas12a, where amplified target DNA activates Cas12a to cleave nearby single-stranded DNA, producing a fluorescent signal for rapid, sensitive detection of DNA pathogens like SARS-CoV-2.

Cas13-based diagnostics detect RNA targets using CRISPR RNA guidance and collateral cleavage of a reporter. Sherlock enables sensitive, rapid RNA detection with fluorescence or color readout, including multiplexed targets.

Faluda uses Cas9 with a guide RNA to bind target DNA and generate a visible lateral flow readout, enabling rapid, affordable field diagnostics for Covid 19 and other pathogens.

Compare Cas12, Cas13, and Faluda to choose the right diagnostic tool for DNA or RNA targets, considering lateral flow versus fluorescence readouts and field versus lab settings.

Answer quiz questions on CRISPR diagnostics, detailing fast field-ready tests with paper strips, Cas12a and Cas13, PAMs, lateral flow, Feluda and Sherlock workflows, and DNA and RNA targets.

Explore how crispr enables gene therapy to correct mutations or disable harmful genes using homology-directed repair and non-homologous end joining, with ex vivo and in vivo delivery and notable successes.

Explore live-cell imaging with CRISPR by labeling DNA with dCas9 fused to fluorescent proteins to visualize chromatin dynamics and gene activity in real time.

Discover chromatin immunoprecipitation with CRISPR, using dCas9 fused to an affinity tag to target a genomic region, enabling transcription factor mapping, sequencing, and epigenetic studies.

Combine fluorescence in situ hybridization with CRISPR to visualize specific DNA sequences in living cells using dCas9 and fluorescent labels for live cell imaging and multiplexing.

Explore gene therapy with CRISPR through a quiz covering HDR-based precise correction vs NHEJ, ex vivo vs in vivo delivery, and reactivating fetal hemoglobin to treat sickle cell.