MicroRNA Expression in Zebrafish Embryonic Development

Author:

Wienholds Erno1234,Kloosterman Wigard P.1234,Miska Eric1234,Alvarez-Saavedra Ezequiel1234,Berezikov Eugene1234,de Bruijn Ewart1234,Horvitz H. Robert1234,Kauppinen Sakari1234,Plasterk Ronald H. A.1234

Affiliation:

1. Hubrecht Laboratory, Centre for Biomedical Genetics, 3584 CT Utrecht, the Netherlands.

2. Howard Hughes Medical Institute, Department of Biology and McGovern Institute for Brain Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

3. Wellcome Trust, Cancer Research UK Gurdon Institute, University of Cambridge, Cambridge CB2 1QN, UK.

4. Wilhelm Johannsen Centre for Functional Genome Research, Institute of Medical Biochemistry and Genetics, University of Copenhagen, DK-2200 Copenhagen N, Denmark.

Abstract

MicroRNAs (miRNAs) are small noncoding RNAs, about 21 nucleotides in length, that can regulate gene expression by base-pairing to partially complementary mRNAs. Regulation by miRNAs can play essential roles in embryonic development. We determined the temporal and spatial expression patterns of 115 conserved vertebrate miRNAs in zebrafish embryos by microarrays and by in situ hybridizations, using locked-nucleic acid–modified oligonucleotide probes. Most miRNAs were expressed in a highly tissue-specific manner during segmentation and later stages, but not early in development, which suggests that their role is not in tissue fate establishment but in differentiation or maintenance of tissue identity.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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