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Alwin Prem Anand, A.* ; Huber, C.* ; Asnet Mary, J.* ; Gallus, N.* ; Leucht, C. ; Klafke, R. ; Hirt, B.* ; Wizenmann, A.*

Expression and function of microRNA-9 in the mid-hindbrain area of embryonic chick.

BMC Dev. Biol. 18:3 (2018)

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Background: MiR-9 is a small non-coding RNA that is highly conserved between species and primarily expressed in the central nervous system (CNS). It is known to influence proliferation and neuronal differentiation in the brain and spinal cord of different vertebrates. Different studies have pointed to regional and species-specific differences in the response of neural progenitors to miR-9. Methods: In ovo and ex ovo electroporation was used to overexpress or reduce miR-9 followed by mRNA in situ hybridisation and immunofluorescent stainings to evaluate miR-expression and the effect of changed miR-9 expression. Results: We have investigated the expression and function of miR-9 during early development of the mid-hind-brain region (MH) in chick. Our analysis reveals a closer relationship of chick miR-9 to mammalian miR-9 than to fish and a dynamic expression pattern in the chick neural tube. Early in development, miR-9 is diffusely expressed in the entire brain, bar the forebrain, and it becomes more restricted to specific areas of the CNS at later stages. MiR-9 overexpression at HH9-10 results in a reduction of FGF8 expression and premature neuronal differentiation in the mid-hindbrain boundary (MHB). Within the midbrain miR-9 does not cause premature neuronal differentiation it rather reduces proliferation in the midbrain. Conclusion: Our findings indicate that miR-9 has regional specific effects in the developing mid-hindbrain region with a divergence of response of regional progenitors.

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