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L and M cone proportions in polymorphic New World monkeys

JACOBS, GERALD H., WILLIAMS, GARY A.·2006·Visual Neuroscience
DOI 10.1017/s0952523806233066
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Abstract

Platyrrhine monkeys typically have only a single X-chromosome opsin gene. Alleles of this gene code for multiple versions of middle- to long-wavelength cone photopigments. X-chromosome inactivation provides heterozygous females with a retinal mosaic of cones containing either of two types of M and L pigment, thus establishing the photopigment basis for trichromatic color vision. This study examined the proportions of L and M cones created by this process. For that purpose, electroretinogram flicker photometry was used to obtain complete spectral sensitivity functions from 60 heterozygous female monkeys drawn from seven genera of platyrrhine monkeys. To obtain estimates of cone proportions, these functions were subsequently fit with linear combinations of L and M cone fundamentals that were derived from similar recordings made on conspecific animals having only one type of M/L pigment. Consistent with a random X-chromosome inactivation process, the average L:M cone weighting across the sample was close to unity. At the same time, there were significant individual variations in L:M cone proportions. The genesis of this variation and its implications for seeing are discussed.

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Metadata

Authors
JACOBS, G. H., & WILLIAMS, G. A.
Venue
Visual Neuroscience
Publisher
Maximum Academic Press
Published
2006-05
Volume
23
Issue
3-4
Pages
365-370
ISSN
  • 0952-5238
  • 1469-8714
DOI
10.1017/s0952523806233066
Cited by
16
References
0
Language
en
Licence
www.cambridge.org/core/terms (unspecified, 128 d)

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