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Identification of differentially expressed genes in carp rods and cones
Yoshie Shimauchi-Matsukawa1, Yoshinobu Aman, Shuji Tachibanaki
1Graduate School of Frontier Biosciences, Osaka University, Osaka, Japan.
Purpose:
Rods and cones differ in their photoresponse characteristics, morphology, and susceptibilities to certain diseases. To contribute to the studies at the molecular level of these differences, we tried to identify genes expressed preferentially in rods or cones.
Methods:
From purified carp rods and cones, we extracted their RNA and obtained corresponding cDNA pools (rod cDNA and cone cDNA). We employed the suppression subtractive hybridization method to identify the genes expressed preferentially in rods or cones. Cone cDNA was subtracted from rod cDNA to obtain cDNA, which ideally contained cDNA expressed preferentially in rods (R/c cDNA). Similarly, rod cDNA was subtracted from cone cDNA to obtain C/r cDNA. With differential array screening, we screened candidate genes that were expressed mainly or exclusively in rods or cones. The nucleotide sequences of the positive genes were determined. In some of them, their mRNA localizations were confirmed by in situ hybridization.
Results:
R/c cDNA contained genes already known to code rod specific proteins, such as cGMP gated channel, transducin beta1, and rhodopsin. In sharp contrast, C/r cDNA contained genes that code proteins of which functions are mostly unknown. Among them, N-myc downregulated gene 1-like (NDRG1L) and aryl hydrocarbon receptor 2 (AhR2) were most abundant, and by in situ hybridization, they were proven to be expressed specifically in cones.
Conclusions:
Using purified rods and cones, we identified mRNAs expressed preferentially in rods or cones. Of particular interest is the specific expression of NDRG1L and AhR2 in cones.
Insights
Researchers identified novel genes specifically expressed in cone photoreceptor cells. These findings, including NDRG1L and AhR2, advance our understanding of cone cell molecular differences and potential disease susceptibilities.
Area of Science:
- Retinal cell biology
- Molecular genetics
- Photoreceptor research
Background:
- Rods and cones, the primary photoreceptor cells in the retina, exhibit distinct functional, morphological, and disease-related characteristics.
- Understanding these differences at the molecular level is crucial for advancing retinal research and developing targeted therapies.
Purpose of the Study:
- To identify genes preferentially expressed in either rod or cone photoreceptor cells.
- To elucidate molecular distinctions between rod and cone cells.
Main Methods:
- Purification of carp rod and cone cells and subsequent RNA extraction.
- Utilizing suppression subtractive hybridization to isolate differentially expressed genes.
- Employing differential array screening and in situ hybridization to validate gene expression patterns.
Main Results:
- Identified known rod-specific genes (e.g., rhodopsin) in rod cDNA.
- Discovered novel genes, including N-myc downregulated gene 1-like (NDRG1L) and aryl hydrocarbon receptor 2 (AhR2), predominantly in cone cDNA.
- Confirmed specific cone expression of NDRG1L and AhR2 via in situ hybridization.
Conclusions:
- Successfully identified mRNAs with preferential expression in rods or cones.
- Highlighted the specific expression of NDRG1L and AhR2 in cone cells, suggesting their potential roles in cone function or disease.
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