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Volume 17, Number 15,
Issue of August 1, 1997
pp. 5881-5890
Copyright ©1997 Society for Neuroscience
Mammalian Homolog of Drosophila retinal degeneration
B Rescues the Mutant Fly Phenotype
Received March 11, 1997; revised May 12, 1997; accepted May 22, 1997.
Jinghua T. Chang1,
Scott Milligan4,
Yuanyuan Li1,
Christina E. Chew1,
Janey Wiggs5,
Neal G. Copeland6,
Nancy A. Jenkins6,
Peter A. Campochiaro1, 2,
David R. Hyde4, and
Donald J. Zack1, 2, 3
1 Wilmer Eye Institute and Departments of
2 Neuroscience and 3 Molecular Biology and
Genetics, Johns Hopkins University School of Medicine, Baltimore,
Maryland 21287-9289, 4 Department of Biological Sciences,
University of Notre Dame, Notre Dame, Indiana 46556, 5 New
England Eye Center, Tufts University School of Medicine, Boston,
Massachusetts 02111, and 6 Mammalian Genetics Laboratory,
ABL-Frederick Cancer Research and Development Center, Frederick,
Maryland 21702
Mutations in the Drosophila rdgB gene, which encodes
a transmembrane phosphatidylinositol transfer protein (PITP), cause a light-enhanced retinal degeneration. Cloning of mammalian
rdgB orthologs (mrdgB) reveal predicted
proteins that are 39% identical to rdgB, with highest
homology in the N-terminal PITP domain (62%) and in a region near the
C terminus (65%). The human mrdgB gene spans ~12 kb
and maps to 11q13.1, a locus where several retinal diseases have also
been mapped. Murine mrdgB maps to a syntenic region on
the proximal region of chromosome 19. MrdgB is
specifically expressed in the retina and brain. In the retina, MrdgB
protein is localized to photoreceptor inner segments and the outer and inner plexiform layers. Expression of murine mrdgB in
mutant flies fully rescues both the rdgB-dependent
retinal degeneration and abnormal electroretinogram. These results
suggest the existence of similarities between the invertebrate and
mammalian retina that were not previously appreciated and also identify
mrdgB as a candidate gene for retinal diseases that map
to 11q13.1.
Key words:
retina;
retinal degeneration;
phosphatidylinositol
transfer protein;
photoreceptors;
phototransduction;
retinal
degeneration B
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