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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 17, Iss. 3 — Mar. 1, 2000
  • pp: 527–537

Cone pigment gene expression in individual photoreceptors and the chromatic topography of the retina

Stephanie A. Hagstrom, Maureen Neitz, and Jay Neitz  »View Author Affiliations


JOSA A, Vol. 17, Issue 3, pp. 527-537 (2000)
http://dx.doi.org/10.1364/JOSAA.17.000527


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Abstract

Human trichromatic vision is based on three classes of cones: L, M, and S (long-, middle-, and short-wavelength sensitive, respectively). Individuals can have more than one M and/or more than one L pigment gene on the X chromosome along with an S pigment gene on chromosome 7. In some people the X-linked pigment gene array can include polymorphic variants that encode multiple, spectrally distinct cone photopigment subtypes. A single-cell, polymerase chain reaction approach was used to examine visual pigment gene expression in individual human cone cells and identify them as L or M. The ratio of L:M pigment gene expression was assayed in homogenized retinal tissues taken from the same eyes. Results indicate that there is a close correspondence between the cone ratio determined from counting single cells and the L:M pigment mRNA ratio estimated from homogenized pieces of retina. The results also show that the different pigment genes in one array are often expressed at very different levels, giving rise to unequal numbers of L and M cones. Expression of only one photopigment gene was detected in each cone cell. However, individual males can have more than the classically described three spectrally distinct cone types in their retinas.

© 2000 Optical Society of America

OCIS Codes
(330.1720) Vision, color, and visual optics : Color vision
(330.5310) Vision, color, and visual optics : Vision - photoreceptors

History
Original Manuscript: July 22, 1999
Revised Manuscript: October 5, 1999
Manuscript Accepted: October 5, 1999
Published: March 1, 2000

Citation
Stephanie A. Hagstrom, Maureen Neitz, and Jay Neitz, "Cone pigment gene expression in individual photoreceptors and the chromatic topography of the retina," J. Opt. Soc. Am. A 17, 527-537 (2000)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-17-3-527


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