RRC ID 4128
Author Rohrschneider MR, Elsen GE, Prince VE.
Title Zebrafish Hoxb1a regulates multiple downstream genes including prickle1b.
Journal Dev. Biol.
Abstract Despite 30 years of Hox gene study, we have a remarkably limited knowledge of the downstream target genes that Hox transcription factors regulate to confer regional identity. Here, we have used a microarray approach to identify genes that function downstream of a single vertebrate Hox gene, zebrafish hoxb1a. This gene plays a critical and conserved role in vertebrate hindbrain development, conferring identity to hindbrain rhombomere (r) 4. For example, zebrafish Hoxb1a, similar to mouse Hoxb1, is required for the migration of r4-derived facial branchiomotor neurons into the posterior hindbrain. We have screened microarrays carrying more than 16,000 expressed sequence tags (ESTs) for genes that are differentially regulated in normal versus Hoxb1a-deficient r4 tissue. Using this approach, we have identified both positively and negatively regulated candidate Hoxb1a target genes. We have used in situ hybridization to validate twelve positively regulated Hoxb1a targets. These downstream targets are expressed in a variety of subdomains within r4, with one gene, a novel prickle homolog (pk1b), expressed specifically within the facial branchiomotor neurons. Using morpholino knock-down and cell transplantation, we demonstrate that the Hoxb1a target Prickle1b functions cell-autonomously to control facial neuron migration, a single aspect of r4 identity.
Volume 309(2)
Pages 358-72
Published 2007-9-15
DOI 10.1016/j.ydbio.2007.06.012
PII S0012-1606(07)01128-1
PMID 17651720
MeSH Adaptor Proteins, Signal Transducing Animals Carrier Proteins / biosynthesis* Cell Movement Expressed Sequence Tags Face / innervation Gene Expression Regulation Homeodomain Proteins / genetics Homeodomain Proteins / metabolism* LIM Domain Proteins Motor Neurons / physiology Oligonucleotide Array Sequence Analysis Signal Transduction Zebrafish / embryology Zebrafish / metabolism* Zebrafish Proteins / biosynthesis*
IF 2.936
Times Cited 63
Zebrafish rw0 (Tg(CM-isl1:GFP))