When it comes to genetic research, fruit flies take the spotlight. They are often used to study specific genes, and researchers who find new genes get the privilege of naming them. The best way to study a gene is to mutate it and see what happens when the gene’s function is lost. As a result, genes are usually named after the phenotype caused by the mutation. For example, one of the genes I work with is amnesiac. As you can probably guess, flies with a mutation in the amnesiac gene can’t form long-term memories!
This naming convention can often be very confusing for first-time fly students. One of the first genes we learn about is the white gene, which codes for eye color. Flies with a normal version of the white gene (usually written as w+ ) actually have red eyes, while flies with a mutation in the white gene ( w– ) have white eyes.
Over the years, fly scientists have amused themselves by choosing hilariously descriptive names for newly discovered genes. Here are some of my favorites (these are real scientific gene names):
- Cheapdate– mutants have decreased resistance to the effects of alcohol
- Hangover– mutants can’t develop a tolerance for alcohol
- Dunce– mutants have learning deficits
- Tinman– This gene regulates the development of a heart, so flies with a mutation in this gene can’t grow a heart. Named after the character in Wizard of Oz
- Ken and Barbie – mutants do not develop external genitals
- Swiss cheese – mutants have holes in their brain
- I’m not dead yet – mutants live twice as long as normal flies, a reference to Monty Python and the Holy Grail
- Groucho Marx – mutants develop an excess of facial bristles
- Out Cold – mutants lose coordination at cold temperatures
- Clumsy – mutants have trouble walking
Fly scientists have been getting away with choosing funny (and sometimes politically incorrect) gene names for decades. But over 75% of fruit fly genes are shared with humans, so not only would some of them eventually be found in humans, but they’d also be associated with a genetic disorder. And that’s where fly scientists can get themselves into trouble. For example, several years ago a gene named Hedgehog made headlines when it was found in humans.
The Hedgehog gene was discovered in 1980, and was given its name based on the observation that a mutation in this gene led to spiky-looking larvae. Three versions of this gene were later found in humans, one of which was named Sonic Hedgehog (SHH) after Sega’s video game character. Unfortunately, this gene has since been linked to a human developmental disorder called Holoprosencephaly, in which an SHH mutation leads to severe brain, skull, and facial defects. Doctors soon began to protest having to explain the joke name to patients with extreme medical conditions.
In 2006, the Human Genome Organization Gene Nomenclature Committee stepped in and changed some of the most offensively named genes. Another gene that was targeted was Lunatic Fringe, which was originally given its name because mutant flies had defects on the edges of their wings. In humans, however, mutations in the gene (which was renamed LFNG) leads a hereditary spinal defect called Jarcho-Levin Syndrome.
But despite these naming blunders, fruit fly research on these genes has and will continue to help in the search for treatments for these genetic disorders. And fly scientists haven’t stopped taking the opportunity to come up with fun names for newly discovered genes. Earlier this year, the Dickson fly lab published a report on “Moonwalker” flies: flies that couldn’t change direction and were permanently stuck walking backwards.
Video: The left side shows a fly walking normally. The right side shows a “moonwalking” fly unable to walk forwards.
- Genetics Home Reference
- Choudhry Z., Adnan Maqsood Choudhry, Sadaf Tariq, Fozia Zakaria, Muhammad Waheed Asghar, Muhammad Khan Sarfraz, Kamran Haider, Afia Ansar Shafiq & Nusrat Jahan Mobassarah (2014). Sonic hedgehog signalling pathway: a complex network, Annals of Neurosciences, 21 (1) DOI: http://dx.doi.org/10.5214/ans.0972.7531.210109