What is Yeast Artificial Chromosomes (YACs)? Yeast artificial chromosomes (YACs) are the result of a recombinant DNA cloning technique used to isolate and propagate extremely large DNA segments in a yeast host. The YAC cloning system enables the replication of exogenous DNA segments as linear molecules on a significantly larger scale than is possible with … Read more
What is PAM Sequence (Protospacer adjacent motif)? Protospacer Adjacent Motif, or PAM, is a type of two-factor authentication that tells Cas to only cut the foreign DNA that is invading. Properties of PAM sequence Spacers/protospacers PAM sequences Functions of PAM Sequence 1. Role of PAM in spacer acquisition 2. Role of PAM in interference 3. … Read more
What is Rolling circle replication? Rolling circle replication is a unidirectional and asymmetric process of nucleic acid replication. It is the process by which multiple copies of circular DNA or RNA molecules is synthesized rapidly. This mechanism is commonly seen in bacterial plasmids, bacteriophages and certain plant and animal viruses. In this type of replication … Read more
CRISPR-Cas9 explained: meaning, components, mechanism, applications, limitations, history, ethics, and current uses in genome editing and medicine.
Name Cas9 endonuclease Alternative name spCas9/spyCas9 Organism Streptococcus pyogenes serotype M1 Molecular weight ~163KDa Gene cas9 Location on chromosome 0.85 to 0.86Mb Protein CRISPR-associated endonuclease Cas9/Csn1 Cofactor Mg2+ Biological processing Interference- defense response to phage.Maintaining CRISPR repeat sequences Functions DNA and RNA bindingMetal ion binding3’-5’ exonuclease activityEndonuclease activity What is Cas9 Protein? Structure of Cas9 HNH … Read more
What is dna repair mechanism? DNA repair is a collection of processes by which a cell identifies and corrects damage to the DNA molecules that encode its genome. dna repair definition Types of dna repair mechanism There are present four types of DNA Repair System such as; 1. Mismatch Repair System Enzyme participate in dna … Read more
Mode of DNA replication Imagine yourself in 1953, right after the discovery of the double helix structure of DNA. What are some burning questions you and other scientists might have? One big question concerned DNA replication. The double helix shape of DNA gave a tantalising hint about how copying might happen. It seemed likely that … Read more
What is cDNA library? Principle of cDNA library Process involved in the construction of cDNA library 1. Extraction of mRNA from the eukaryotic cell 2. cDNA construction In the process of creating cDNAs, there’s different approaches. They are described as follows: a. The RNAse method Step I: Annealing: Step II: Replacing RNA strand with DNA … Read more
A ribonucleoprotein known as telomerase, terminal transferase adds a repeat sequence of telomeres to the 3′ end of chromosomes, the length of which varies depending on species. In most eukaryotic organisms, the chromosomal ends are capped by a repeating sequence known as a telomere. Telomeres prevent DNA damage and chromosomal fusion at the chromosome’s end. … Read more
What is SOS Response or SOS Repair? Definition of SOS Response or SOS Repair The SOS response or SOS repair is a cellular mechanism activated in response to DNA damage, where the cell cycle is temporarily halted to facilitate DNA repair and mutagenesis. Central to this system is the RecA protein, which, when stimulated by … Read more
