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206

N. Yan et al.

and UCSC (http://genome.ucsc.edu/) database (Lall et al. 2006; Lewis et al. 2003). Genes directly correlated with retinal development were selected for analysis.

23.3 Results and Discussion

23.3.1 miRNA Microarray Analysis

Microarray assay provides a powerful tool for analyzing both miRNA expression patterns and quantitative expression levels, the fluorescence scanning map was shown in Fig. 23.1. Class comparison and SAM were performed to identify differences in miRNA expression of retinal tissues. Twenty-eight miRNAs were detected as differential expression between newborn and adult rabbit retina. Among these, 17 appear to be up-regulated and the other 11 miRNAs downregulated, suggesting that these miRNAs might play a role in retinal development (Table 23.1).

Fig. 23.1 Fluorescence scanning map of miRNA microarray. a: pseudocolor image I Cy3, pseudocolor image M Cy5; b: pseudocolor image I Cy5; D: pseudocolor image M Cy3

23 Profiling MicroRNAs Differentially Expressed in Rabbit Retina

207

 

Table 23.1 miRNAs microarray SAM results of I and M samples

 

 

 

 

 

 

 

Up-regulated

 

Down-regulated

 

 

 

miRNA

Newborn/adult

miRNA

Newborn/adult

hsa-miR-18a

4.1486

hsa-miR-130b

5.8852

hsa-miR-20a

12.9398

mmu-miR-34b-5p

10.1031

hsa-miR-216a

8.0302

hsa-miR-20b

6.9742

hsa-miR-17

6.7509

hsa-miR-18b

14.4449

hsa-miR-106a

8.1018

hsa-miR-19a

5.5511

hsa-miR-106b

5.4884

hsa-miR-93

5.1490

hsa-miR-15b

3.8734

hsa-miR-19b

4.5873

hsa-miR-16

6.3309

hsa-miR-92b

9.5928

hsa-miR-181c

5.6769

hsa-miR-30c

3.9409

hsa-miR-125b

5.6260

hsa-miR-204

4.0983

hsa-miR-192

4.6176

hsa-miR-185

3.7080

hsa-miR-29a

4.7579

hsa-miR-22

4.5589

hsa-miR-29c

3.3060

hsa-miR-422a

16.4091

hsa-miR-29b

5.1833

hsa-miR-129-3p

6.8226

23.3.2 Putative miRNA Target Gene Prediction

PicTar and TargetScan 4.0 prediction programs were used to predict changes in the miRNAs, and the putative targets related to miRNA were screened using the UCSC and NCBI databases. Our studies shown that some screened genes appear to be directly correlated with retinal development, and might be involve in signal pathways for cell growth, apoptosis, transcription factor binding, enzyme activator activity, cell proliferation, regulation of cell cycle, neurogenesis, or cell cycle. Some of the target genes might also be directly associated with signal pathways relevant to visual development including sensory perception of light, visual perception, Hs_GPCRDB_Class_A_Rhodopsin-like (Human G-Protein Coupled Receptors DataBase Class A Rhodopsin-like) and rhodopsin-like receptor activity, etc (Table 23.2).

For this study, we chose the rabbit retina because it is amenable to preand post-natal manipulation and because the developments of many neuron-specific properties have been investigated using this retina as a model system (Lam et al. 1980; Fung et al. 1982; Lam 1987). By comparing the miRNA expression profile in newborn and adult-rabbit retina using miRNA array technology, we have identified a number of putative miRNA and target genes that might contribute to retinal development and maturation. Further investigations, including miRNA analyses at different developmental stages and comparison with other relevant studies might shed light on the molecular mechanisms regulating neural development.