HOME >> BIOLOGY >> NEWS
DDT-resistant insects have additional genetic advantage that helps resistance spread

le once the pesticide taken out of use and DDT-susceptible insects would regain dominance.

"Although this assumption is widespread, data to support this contention is actually thin," said Professor ffrench-Constant. He believes previous work may not have looked at genetically related strains and that 'costs' may therefore be associated with the differing genetic backgrounds of insects examined, and not the resistance genes themselves.

"Experimenters looking at genetic fitness in resistant insects often only look at single character traits such as number of eggs laid, and often compare resistant and susceptible lines that are genetically unrelated.

"Differences in fitness therefore often correspond to differences in genetic background rather and are not due to the resistance gene itself."

Using DDT-resistant fruit flies (Drosophila melanogaster) in state-of-the-art controlled temperature rooms provided by the Wolfson Trust, Caroline McCart, a PhD student in the Department of Biology and Biochemistry at the University, went to great lengths to make sure that DDT resistant and susceptible strains differed only by the resistance gene itself.

Using antibiotics they also 'cured' the flies of the microbes that are known to affect their ability to reproduce and could affect the results.

In order to assess the genetic fitness of both the resistant and susceptible strains, the researchers monitored the survival and development rate of all life stages of their offspring.

They found that DDT resistance in fruit flies not only carries no cost but in fact confers an advantage when inherited through the female.

This discovery comes at a time when a number of developing nations, including South Africa, are considering re-introducing (or continuing the use of) DDT in an attempt to reduce the major health problems caused by malaria.

Use of DDT (Dichloro-diphenyl-trichloroethane) increased enormously on a worl
'"/>

Contact: Andrew McLaughlin
a.mclaughlin@bath.ac.uk
44-122-538-6883
University of Bath
8-Aug-2005


Page: 1 2 3

Related biology news :

1. Tropical insects go the distance to inform rainforest conservation
2. For many insects, winter survival is in the genes
3. Do we need a paradigm change? Disputing coevolution in herbivorous insects
4. Why are there so many more species of insects? Because insects have been here longer
5. Identification of carbon dioxide receptors in insects may help fight infectious disease
6. Why do insects like to eat some plants more than others?
7. Biological clock of honey bee more similar to humans than to insects
8. Lennart Nilsson Award for outstanding photography of the world of insects
9. Giant insects might reign if only there was more oxygen in the air
10. New study explains why hotter is better for insects
11. Obesity crisis in insects? Not a problem, says expert

Post Your Comments:
(Date:4/17/2014)... . Our eyes ... us with a continuous stream of information about our own ... in a car the world glides by us and ... effort, our brain calculates self-motion from this "optic flow". This ... gaze during our own movements. Together with biologists from the ...
(Date:4/17/2014)... years ago, Katia Silvera , a postdoctoral scholar at ... a field trip in a mountainous area in central Panama ... before. , Unable to identify it, they contacted German Carnevali, ... to be an unnamed species. So Carnevali recently named it ... the genus name, comprising about 40 species in the world. ...
(Date:4/17/2014)... in Europe, Asia and the United States are spreading ... impacting native honeybee populations at this time, according to ... including Nosema microsporidia and Varroa ... to these invasive pests, which suggests to us that ... and the United States currently are not necessary in ...
Breaking Biology News(10 mins):How vision makes sure that little fish do not get carried away 2How vision makes sure that little fish do not get carried away 3How vision makes sure that little fish do not get carried away 4Orchid named after UC Riverside researcher 2Orchid named after UC Riverside researcher 3East African honeybees are safe from invasive pests… for now 2East African honeybees are safe from invasive pests… for now 3
(Date:1/15/2014)... NY (PRWEB) January 15, 2014 The Microcompetition ... a major disease. One of these latent viruses is the ... rheumatoid arthritis (RA). Rheumatoid arthritis (RA) is a chronic inflammatory ... theory, a study found that RA patients have high concentrations ...
(Date:1/15/2014)... (PRWEB) January 15, 2014 Freeslate, ... solutions, today announced that Lupin Limited, one of India’s ... CM Protégé PharmD System for high throughput ... India, is focused on a wide range of quality, ...
(Date:1/14/2014)... 14, 2014 Date: Friday, April 11, 2014 ... Country Club, 1360 Almshouse Road, Warrington, Pa. , ... solely dedicated to finding a cure for hepatitis B and ... host its annual Crystal Ball on Friday, April 11 at ...
(Date:1/14/2014)... a leading provider of strategic communications services to corporations and organizations ... the United States and Europe ... is returning to the firm,s Washington, D.C. ... than two years of service as Associate Commissioner for the Office ...
Breaking Biology Technology:Study: Rheumatoid Arthritis (RA) Patients Have EBV; The CBCD Says this is Consistent with Microcompetition 2Study: Rheumatoid Arthritis (RA) Patients Have EBV; The CBCD Says this is Consistent with Microcompetition 3Lupin Selects Freeslate’s CM Protégé PharmD System to Accelerate Polymorph Screening for Drug Development 2Lupin Selects Freeslate’s CM Protégé PharmD System to Accelerate Polymorph Screening for Drug Development 3Hepatitis B Foundation to Host Annual Crystal Ball Gala 2Former FDA Associate Commissioner Returns To 3D Communications 2
Cached News: