Protan color vision deficiency with a unique order of green-red as the first two genes of a visual pigment array.
Normal visual pigment gene arrays on the human X chromosome have a red gene at the first and a green gene at the second positions. More than half of the arrays have additional green genes downstream, but only the first two genes of the array are likely to be expressed in the retina. An array consisting of four genes in two Japanese participants, A121 and A447, was detected either by pulsed field gel electrophoresis and subsequent Southern hybridization or by single nucleotide primer extension reaction. In both participants, the first gene of the array was green, downstream genes were red and green, and the fourth gene was green. The red gene was determined to be at the second position by comparison of polymorphic sites among the intergenic regions that had been amplified by long-range PCR. Such an array with a reverse normal order of pigment genes, green-red as the first two, has never been reported before. They were expected to have normal color vision but showed protan deficiency (protanomaly), a phenotype lacking the red pigment. The red gene had no mutations in the exons and exon/intron boundaries, but had an A-71C substitution in the promoter in both participants.
Ueyama
Hisao
H
Department of Biochemistry and Molecular Biology, Shiga University of Medical Science, Seta, Otsu, 520-2192, Japan. datt@belle.shiga-med.ac.jp.
Tanabe
Shoko
S
Institute of Vision Research, 12-23 Sanbonmatsu-cho, Atsuta-ku, Nagoya, 456-0032, Japan.
Muraki-Oda
Sanae
S
Department of Ophthalmology, Shiga University of Medical Science, Seta, Otsu, 520-2192, Japan.
Yamade
Shinichi
S
Department of Ophthalmology, Shiga University of Medical Science, Seta, Otsu, 520-2192, Japan.
Ohkubo
Iwao
I
Department of Biochemistry and Molecular Biology, Shiga University of Medical Science, Seta, Otsu, 520-2192, Japan.
D000293:Adolescent; D000328:Adult; D001483:Base Sequence; D015139:Blotting, Southern; D003116:Color; D003118:Color Perception / Q000235:genetics*; D003117:Color Vision Defects / Q000235:genetics* / Q000503:physiopathology*; D016521:Electrophoresis, Gel, Pulsed-Field; D005091:Exons / Q000235:genetics; D018628:Gene Dosage; D023061:Gene Order; D006801:Humans; D007564:Japan; D008297:Male; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D012168:Retinal Pigments / Q000235:genetics*
D012168:Retinal Pigments