期刊
DEVELOPMENTAL CELL
卷 29, 期 6, 页码 635-648出版社
CELL PRESS
DOI: 10.1016/j.devcel.2014.04.023
关键词
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资金
- EJLB Foundation
- Canadian Institutes of Health Research
- Spanish Ministerio de Economia y Competitividad [BFU 2008-00632, BFU2011-26075, CSD2007-00008]
- Fundacion Ramon Areces
- Burroughs Wellcome Fund
- NIH [R01-NS074037, R01-NS083833]
The Drosophila Bithorax complex (BX-C) Hox cluster contains a bidirectionally transcribed miRNA locus, and a deletion mutant (Delta mir) lays no eggs and is completely sterile. We show these miRNAs are expressed and active in distinct spatial registers along the anterior-posterior axis in the CNS. Delta mir larvae derepress a network of direct homeobox gene targets in the posterior ventral nerve cord (VNC), including BX-C genes and their TALE cofactors. These are phenotypically critical targets, because sterility of Delta mir mutants was substantially rescued by heterozygosity of these genes. The posterior VNC contains IIp7+ oviduct motoneurons, whose innervation and morphology are defective in Delta mir females, and substantially rescued by heterozygosity of Delta mir targets, especially within the BX-C. Collectively, we reveal (1) critical roles for Hox miRNAs that determine segment-specific expression of homeotic genes, which are not masked by transcriptional regulation; and (2) that BX-C miRNAs are essential for neural patterning and reproductive behavior.
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