Reverse genetics
Method to determine gene function by engineering specific genetic changes.
Reverse genetics is a method in molecular genetics used to understand gene function by analyzing phenotypic effects caused by engineered changes in specific nucleic acid sequences. It proceeds opposite to forward genetics, seeking to identify what phenotypes are controlled by particular genetic sequences rather than finding the genetic basis of a phenotype.
- field
- Molecular genetics
- known_for
- Connecting genetic sequences to phenotypic effects through directed mutations, gene silencing, and vaccine synthesis
- techniques
- Site-directed mutagenesis, gene knockout, CRISPR-Cas9, RNA interference, Morpholino oligos, transgenic overexpression
Lore & Background
Reverse genetics emerged as a counterpart to classical forward genetics, leveraging automated DNA sequencing to generate large volumes of genomic data. Researchers engineer changes such as directed deletions, point mutations, or gene knockouts to observe effects on the whole organism. Techniques like site-directed mutagenesis allow subtle codon changes or creation of null alleles, while CRISPR-Cas9 has made reverse-genetic knockout mutations practical in many organisms.
Reader's Guide
Reverse genetics has become a cornerstone of functional genomics, enabling researchers to systematically link genetic sequences to biological roles. Its significance extends to virology, where it allows recovery of infectious viruses with desired mutations, and to vaccine synthesis, particularly for influenza, where an eight-plasmid system rapidly produces attenuated vaccines. The method's legacy includes the creation of mutant libraries in model organisms like yeast and moss, and the development of gene silencing tools such as RNA interference and Morpholino oligos, which provide temporary knockdown effects. By allowing analysis of loss-of-function phenotypes without access to mutant alleles, reverse genetics has broadened the scope of genetic research across many organisms and cell types.
Did You Know?
- Reverse genetics can create null alleles via gene knockout, such as in yeast, mice, and moss.
- CRISPR-Cas9 has made reverse-genetic knockout mutations practical in many previously difficult-to-manipulate organisms.
- RNA interference creates a specific knockout effect without mutating the DNA of interest.
- Reverse genetics is used to generate attenuated influenza vaccines using an eight-plasmid system.
More in Genetics Fundamentals 1-24
Spotted an error? Know more?
This is a living reference — every entry is fact-audited, and reader corrections feed straight into our audit queue. Suggest an edit · See this site's audit record