HOME >> BIOLOGY >> NEWS
Genetic studies endow mice with new color vision

of photoreceptor cells in the retina that preferentially absorb lights at different wavelengths. These are known as cone cells and each type contains a particular kind of light-absorbing sensor protein. Short-wavelength-sensitive (S) cone cells are most sensitive to blue lights, medium-wavelength-sensitive (M) cone cells are most sensitive to green lights, and long-wavelength-sensitive (L) cones are most sensitive to red lights. When light strikes the retina and activates the cone cells, the brain compares the responses of the S, M, and L photoreceptors, and it is the brains assessment of their relative levels of activation that we perceive as color.

Most mammals, including mice, are dichromats, possessing only S and M cone pigments. As a consequence, they can distinguish only a fraction of the wavelengths that can be distinguished by humans. John Mollon at the University of Cambridge has suggested that the evolution of trichromacy could have permitted primates to discriminate between unripe fruit, which is typically green, and ripe red- and orange-colored fruits. Reciprocally, the colors of ripened fruits may have coevolved with primate trichromacy, since animals that could recognize and eat the ripe fruit would have assisted plants by spreading their seeds.

Nathans, a Howard Hughes Medical Institute researcher at Johns Hopkins, worked out the structure of the human S, M, and L pigments and the genetic basis of human color vision variation beginning in the 1980s. At the same time, Jacobs, at UCSB, deciphered the distinctive genetic mechanism that gives rise to trichromatic color vision in New World (South American) primates. Together, their work has suggested that the type of trichromatic color vision that New World monkeys possess may also be the evolutionary precursor to the form found among Old World (African) primates, including humans.

In the current study, the researchers set out to replicate what most scientists had considered the crucial s
'"/>

Contact: Jennifer Michalowski
michalow@hhmi.org
301-215-8576
Howard Hughes Medical Institute
22-Mar-2007


Page: 1 2 3 4

Related biology news :

1. Genetic variation helps to understand predisposition to schizophrenia
2. Genetic factors strongly shape how peers are chosen
3. Genetic analysis finds greater threat in frog-killing fungus
4. Genetic diversity in honeybee colonies boosts productivity
5. 2007-2008 Genzyme/ACMGF Clinical Genetics Fellowship In Biochemical Genetics award winner announced
6. Maynard Olson receives $500,000 Gruber Genetics Prize
7. Genetic defect links respiratory disease and congenital heart disease
8. Cell Press announces new partnership with the American Society of Human Genetics
9. Genetic fellow traveler discovered in Alzheimers
10. Genetic roots of bipolar disorder revealed by first genome-wide study of illness
11. Health disparities -- Genetics, society and race play an important role in access to healthcare

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:7/10/2020)... ... 2020 , ... Today CJ BIO announced the first in a series of ... taste” phenomenon that is revolutionizing ingredient mixes, nutritional content and flavor profiles across a ... July 13, 2020 at11:00 AM (CDT) during SHIFT20, the virtual edition of the IFT ...
(Date:7/1/2020)... ... July 01, 2020 , ... Catalent, a global leader in ... Pharmaceuticals’ packaging facility in Minakuchi, located in the Shiga prefecture of Japan. , ... Kakegawa, the new 60,000-square-foot facility will provide customers with flexible clinical supply solutions, ...
(Date:6/25/2020)... ... June 24, 2020 , ... ... and software-driven clinical data services that accelerate drug development, is collaborating with Karyopharm ... XPO1 inhibitor, in hospitalized patients with severe COVID-19. This is the first study ...
Breaking Biology News(10 mins):
(Date:7/10/2020)... Va. (PRWEB) , ... July 08, 2020 , ... ... testing services and products, announces a significant expansion of laboratory operations through its ... collection for agencies implementing testing programs. , Bode-CARES provides a ...
(Date:7/7/2020)... ... July 06, 2020 , ... R3 International is now offering stem cell ... million stem cells. Depending on the patient's condition, treatment may be offered IV, intrathecal ... having some form of Alzheimers dementia, and the incidence continues to increase as individuals ...
(Date:7/1/2020)... (PRWEB) , ... June 30, ... ... expert tissue data insights, today announced that the launch of a new ... along with data about the tumor microenvironment (TME). , “Flagship’s TissueInsight is ...
(Date:6/28/2020)... ... June 26, 2020 , ... ... security solutions providers, today announced its strong opposition to the recently introduced bicameral ... impose a blanket ban on most federal use of nearly all biometric and ...
Breaking Biology Technology:
Cached News: