Expression of a novel zebrafish zinc finger gene, gli2b, is affected in Hedgehog and Notch signaling related mutants during embryonic development.
Gli zinc-finger proteins are known as downstream mediators of the evolutionary conserved Hedgehog pathway. In zebrafish, gli2 functions differently from Gli2 in mammals. This difference could be due to the gli2 duplication in teleosts evolution and partial redundancy between two duplicated genes. Here, we report a novel zebrafish gli2-like cDNA. Its structure, genetic location, and distinct expression pattern in the central nervous system suggested that this gene might represent a second gli2 of teleosts, and we named it gli2b. gli2b was expressed in the neural keel, excluding the forebrain-midbrain boundary, while gli2 expression complemented this pattern. After 24 hours postfertilization, several specific domains of gli2b expression were observed in the lateral and medial hindbrain and hypothalamus. In mutants affecting the Hedgehog and Notch signaling pathways, gli2b expression was either disrupted or extended in different regions.
Ke
Zhiyuan
Z
Department of Biological Sciences, National University of Singapore, Singapore 117604.
Emelyanov
Alexander
A
Lim
Simon Eng Seng
SE
Korzh
Vladimir
V
Gong
Zhiyuan
Z
D000595:Amino Acid Sequence; D000818:Animals; D002874:Chromosome Mapping; D018076:DNA, Complementary / Q000378:metabolism; D005816:Genetic Complementation Test; D053823:Hedgehog Proteins; D007150:Immunohistochemistry; D017403:In Situ Hybridization; D008957:Models, Genetic; D008969:Molecular Sequence Data; D009154:Mutation; D010766:Phosphorylation; D010802:Phylogeny; D017434:Protein Structure, Tertiary; D012333:RNA, Messenger / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017386:Sequence Homology, Amino Acid; D015398:Signal Transduction; D013997:Time Factors; D015534:Trans-Activators / Q000096:biosynthesis* / Q000235:genetics; D014157:Transcription Factors / Q000096:biosynthesis* / Q000235:genetics*; D015027:Zebrafish; D029961:Zebrafish Proteins / Q000096:biosynthesis* / Q000235:genetics*; D000075746:Zinc Finger Protein Gli2; D016335:Zinc Fingers
D018076:DNA, Complementary; D053823:Hedgehog Proteins; D012333:RNA, Messenger; D015534:Trans-Activators; D014157:Transcription Factors; D029961:Zebrafish Proteins; D000075746:Zinc Finger Protein Gli2; C118355:gli2a protein, zebrafish