Biotechnology Terms Starting With R
Biotechnology Glossary: R
Jump to Biotechnology Term
Recombinant DNA
/ reh-KOM-bih-nunt dee-en-ay / · Latin recombinare, to combine again; Deoxyribonucleic Acid
Recombinant DNA is a laboratory-made DNA molecule constructed by joining DNA sequences from two or more different sources using restriction enzymes and DNA ligase.
The technology, pioneered by Herbert Boyer and Stanley Cohen in 1973, enabled genes from any organism to be inserted into bacterial plasmids for amplification and expression. Recombinant DNA formed the technical foundation of the modern biotechnology industry, enabling production of human proteins in microbial hosts, development of transgenic organisms, and molecular medicine. Safety concerns about recombinant DNA led to the historic 1975 Asilomar Conference, where scientists voluntarily established guidelines before regulatory frameworks existed.
Recombinant DNA joins DNA sequences that were not originally together. The method made it possible to produce many proteins in laboratory organisms.
How To Become An Internal Medicine Specialist? →Recombinant DNA must always mix DNA from different species. It can also combine DNA pieces from the same species in a new arrangement.
A plasmid carrying the human insulin coding sequence is recombinant DNA. Bacteria with that plasmid can produce insulin protein.
Reporter Gene
/ reh-POR-ter jeen / · Old French reporter, to bring back; Greek genea
Reporter Gene reporter gene is a gene encoding an easily detectable protein that is fused to or placed under control of a regulatory element of interest to monitor gene expression, protein localization, or promoter activity.
Common reporters include green fluorescent protein and its variants for live imaging, luciferase for bioluminescence assays, beta-galactosidase for histochemical staining, and alkaline phosphatase for enzyme-linked detection. Reporter genes enable real-time visualization of gene expression dynamics in living cells and organisms and are indispensable tools and are used across cell biology, developmental biology, and drug discovery. CRISPR-based endogenous tagging allows reporters to be inserted at the native genomic locus of any gene.
A reporter gene makes a signal that is easy to detect. It helps scientists see when or where a regulatory sequence is active.
Reporter genes report by sending information like a sensor with a screen. They produce measurable products such as light, color, or fluorescence.
Green fluorescent protein can be used as a reporter gene in living cells. Cells expressing the reporter glow green under the right light.
Restriction Fragment Length Polymorphism
/ reh-STRIK-shun FRAG-ment LENGTH pol-ih-MOR-fizm / · Latin restrictio; Latin fragmentum; Greek polymorphos, many forms
Restriction Fragment Length Polymorphism restriction fragment length polymorphism is a variation in the length of DNA fragments produced by restriction enzyme digestion at a specific locus, used as a genetic marker for mapping and identification.
RFLPs arise when a mutation creates or destroys a restriction enzyme recognition site, or when a variable number of tandem repeats alters fragment size between alleles. Detected by Southern blotting with labeled probes, RFLPs were the first widely used co-dominant DNA markers for genetic linkage analysis and forensic identity testing. They have largely been replaced by PCR-based markers such as STRs and SNPs, which are faster, more informative, and require less DNA.
RFLPs are DNA length differences revealed after restriction enzyme cutting. They were important genetic markers before modern sequencing became common.
Are Enzymes Proteins? →RFLP analysis reads every DNA base. It detects fragment size differences caused by sequence variation at restriction sites or nearby regions.
Early genetic mapping used RFLP markers to track inheritance of chromosome regions in families. Fragment patterns helped link markers to disease genes.