Patterned rhodopsin expression in R7 photoreceptors of mosquito retina: Implications for species-specific behavior.

Full Abstract

Visual perception of the environment plays an important role in many mosquito behaviors. Characterization of the cellular and molecular components of mosquito vision will provide a basis for understanding these behaviors. A unique feature of the R7 photoreceptors in Aedes aegypti and Anopheles gambiae is the extreme apical projection of their rhabdomeric membrane. We show here that the compound eye of both mosquitoes is divided into specific regions based on nonoverlapping expression of specific rhodopsins in these R7 cells. The R7 cells of the upper dorsal region of both mosquitoes express a long wavelength op2 rhodopsin family member. The lower dorsal hemisphere and upper ventral hemisphere of both mosquitoes express the UV-sensitive op8 rhodopsin. At the lower boundary of this second region, the R7 cells again express the op2 family rhodopsin. In Ae. aegypti, this third region is a horizontal stripe of one to three rows of ommatidia, and op8 is expressed in a fourth region in the lower ventral hemisphere. However, in An. gambiae the op2 family member expression is expanded throughout the lower region in the ventral hemisphere. The overall conserved ommatidial organization and R7 retinal patterning show these two species retain similar visual capabilities. However, the differences within the ventral domain may facilitate species-specific visual behaviors.

Author information

Author/s: Hu, Xiaobang (X); England, James H (JH); Lani, Aaron C (AC); Tung, Jennifer J (JJ); Ward, Nicholas J (NJ); Adams, Sheila M (SM); Barber, Kathleen A (KA); Whaley, Michelle A (MA); O'Tousa, Joseph E (JE);

Affiliation: Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana 46556, USA.

Grants: EY006808 (Agency:NEI NIH HHS)

Journal and publication information

Publication Type: Comparative Study; Journal Article; Research Support, N.I.H., Extramural

Journal: The Journal of comparative neurology (J Comp Neurol), published in United States. (Language: eng)

Reference: 2009-Oct; vol 516 (issue 4) : pp 334-42

Dates: Created 2009/08/11; Completed 2009/11/02;

PMID: 19637310, status: MEDLINE (last retrieval date: 11/2/2009, IMS Date: )

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