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A novel mutation in the short-wavelength-sensitive cone pigment gene associated with a tritan color vision defect

  • KAREN L. GUNTHER (a1), JAY NEITZ (a1) and MAUREEN NEITZ (a1)

Abstract

Inherited tritan color vision deficiency is caused by defects in the function of the short-wavelength-sensitive (S) cones. This heterozygous group of disorders has an autosomal dominant pattern of inheritance. Amino acid variations of the S cone opsin are rare and all that have been identified thus far are associated with inherited tritan color vision defects. Here we report the identification of a 30-year-old male who made errors on standard color vision tests consistent with the presence of a mild tritan color vision deficiency. We tested the hypothesis that his color vision impairment was due to a mutation in the S cone photopigment gene. He was found to be heterozygous for a mutation that caused the amino acid proline to be substituted in place of a highly conserved leucine at amino acid position 56 in the S cone opsin. This mutation was absent in 564 S cone photopigment genes from 282 subjects who did not make tritan errors. Thus, we conclude that this mutation disrupts the normal function of S cones.

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Corresponding author

Address correspondence and reprint requests to: Maureen Neitz, Department of Ophthalmology, Medical College of Wisconsin, 925 N. 87th Street, Milwaukee, WI 53226-4812, USA. E-mail: mneitz@mcw.edu

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Keywords

A novel mutation in the short-wavelength-sensitive cone pigment gene associated with a tritan color vision defect

  • KAREN L. GUNTHER (a1), JAY NEITZ (a1) and MAUREEN NEITZ (a1)

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