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Sequence analysis of the mouse IRBP gene and cDNA
R Keith Shuler1, Eleanore Gross, Wei-Ya He
1Department of Ophthalmology, Emory University, Atlanta, GA 30322, USA.
Current Eye Research
|November 16, 2002
Summary
The mouse interphotoreceptor retinoid-binding protein (IRBP) gene structure is conserved across mammals, supporting its role in vision. Aberrant IRBP mRNA in knockout mice correlates with absent Repeat 4 protein.
Area of Science:
- Genetics
- Molecular Biology
- Vision Science
Background:
- Interphotoreceptor retinoid-binding protein (IRBP) plays a crucial role in the visual cycle.
- Understanding IRBP gene structure and expression is vital for comprehending retinoid transport and photoreceptor function.
Purpose of the Study:
- To elucidate the structure of the mouse IRBP gene.
- To compare the predicted primary structure of IRBP repeats across species.
- To quantify IRBP RNA expression levels in normal versus knockout mice.
Main Methods:
- DNA sequencing of the mouse IRBP gene using P1 clones and PCR amplification.
- RNA extraction from mouse retinas followed by reverse transcription-PCR (RT-PCR).
- SYBR Green-based monitoring of double-stranded DNA product accumulation during RT-PCR.
Main Results:
- A 14.4 kb contig of the mouse IRBP gene was assembled, revealing conserved exon-intron structure with human and bovine genes.
- Repeated low-complexity sequences were identified upstream of the transcription start site and within Intron C.
- Reduced levels (approx. 10-fold) of IRBP mRNA were detected in IRBP knockout mice compared to normal mice.
Conclusions:
- Conserved gene structure and protein sequence among mammals highlight the biological significance of IRBP in vision.
- The presence of low-level aberrant IRBP mRNA in knockout mice aligns with the absence of detectable Repeat 4 protein.