Analysis of Mir-9 Expression Pattern in Rat Retina During Postnatal Development

Etelka Postyeni,Andrea Kovacs-Valasek,Peter Urban,Lilla Czuni,Gyorgy Setalo,Csaba Fekete,Robert Gabriel

International journal of molecular sciences（2021）SCI 2区SCI 3区

Univ Pecs | Janos Szentagothai Res Ctr

Cited 4|Views29

Abstract

It is well established that miR-9 contributes to retinal neurogenesis. However, little is known about its presence and effects in the postnatal period. To expand our knowledge, miRNA-small RNA sequencing and in situ hybridization supported by RT-qPCR measurement were carried out. Mir-9 expression showed two peaks in the first three postnatal weeks in Wistar rats. The first peak was detected at postnatal Day 3 (P3) and the second at P10, then the expression gradually decreased until P21. Furthermore, we performed in silico prediction and established that miR-9 targets OneCut2 or synaptotagmin-17. Another two microRNAs (mir-135, mir-218) were found from databases which also target these proteins. They showed a similar tendency to mir-9; their lowest expression was at P7 and afterwards, they showed increase. We revealed that miR-9 is localized mainly in the inner retina. Labeling was observed in ganglion and amacrine cells. Additionally, horizontal cells were also marked. By dual miRNA-in situ hybridization/immunocytochemistry and qPCR, we revealed alterations in their temporal and spatial expression. Our results shed light on the significance of mir-9 regulation during the first three postnatal weeks in rat retina and suggest that miRNA could act on their targets in a stage-specific manner.

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Key words

mir-9,retina,postnatal development,in situ hybridization,qPCR,next-generation sequencing,synaptotagmin-17,OneCut2

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