Related Experiment Video
Updated: Jan 10, 2026
08:25
Using a Fluorescent PCR-capillary Gel Electrophoresis Technique to Genotype CRISPR/Cas9-mediated Knockout Mutants in a High-throughput Format
Published on: April 8, 2017
14.4K
Genetic Convergence Analysis of CRISPR Perturbations Deciphers Gene Functional Similarity
Tianyu Zhang1, Ergan Shang2, Kathryn Roeder2,3
1Department of Statistics and Applied Probability, University of California, Santa Barbara, CA.
Biorxiv : the Preprint Server for Biology
|November 26, 2025
Summary
We developed XConTest to quantify genetic convergence, identifying when different gene disruptions yield similar outcomes. This method helps understand gene function by analyzing CRISPR screen data more effectively.
Area of Science:
- Genomics
- Molecular Biology
- Bioinformatics
Background:
- CRISPR screens with single-cell RNA sequencing (Perturb-seq) are vital for gene function discovery.
- Quantifying similarity between CRISPR perturbations is a key challenge.
- Genetic convergence, where distinct gene disruptions cause similar downstream effects, requires robust analytical methods.
Purpose of the Study:
- To introduce XConTest, a novel statistical procedure for assessing genetic convergence.
- To provide a reliable method for comparing CRISPR perturbations.
- To identify sets of genes with shared functionality based on perturbation outcomes.
Main Methods:
- A two-step, cross-validated procedure (XConTest) was developed.
- Test statistics are designed to approximate a standard normal distribution under orthogonal perturbation influence.
- The method was applied to autism gene and immune response gene datasets.
Main Results:
- XConTest provides a quantitative measure for genetic convergence.
- The procedure demonstrates utility in analyzing complex biological datasets.
- Identified sets of genes with common functionality in autism and immune response studies.
Conclusions:
- XConTest offers a statistically sound approach to analyzing genetic convergence from CRISPR screens.
- This method enhances the understanding of gene function and biological pathways.
- The findings contribute to the analysis of large-scale genetic perturbation data.
Related Concept Videos
02:31Homologous Recombination
62.5K
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
62.5K
01:59CRISPR
57.4K
Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced...
57.4K
01:28CRISPR/Cas9 Genome Editing
1.6K
The CRISPR-Cas system serves as a bacterial defense mechanism against invading genetic elements such as viruses and plasmids, forming the foundation for its adaptation as a powerful genome-editing tool. Originally discovered in prokaryotes, this system has been repurposed to revolutionize genetic engineering across a wide range of organisms, including plants, animals, and humans. The core component, Cas9, is an endonuclease derived from Streptococcus pyogenes, capable of introducing...
1.6K
02:54Evolutionary Relationships through Genome Comparisons
6.8K
Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
6.8K
02:08Gene Conversion
10.5K
Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
10.5K
02:53CRISPR and crRNAs
18.7K
Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
18.7K