ZFIN ID: ZDB-PUB-070629-16
Transgenic analysis of the anterior eye-specific enhancers of the zebrafish gelsolin-like 1 (gsnl1) gene
Yoshikawa, S., Norcom, E., Nakamura, H., Yee, R.W., and Zhao, X.C.
Date: 2007
Source: Developmental dynamics : an official publication of the American Association of Anatomists   236(7): 1929-1938 (Journal)
Registered Authors: Nakamura, Hisashi, Yoshikawa, Shunichi, Zhao, Xinping
Keywords: anterior segment, cornea, annular ligament, gsnl1, transgenic zebrafish
MeSH Terms:
  • Animals
  • Animals, Genetically Modified*
  • Anterior Eye Segment/metabolism*
  • Enhancer Elements, Genetic*
  • Gelsolin/genetics*
  • Promoter Regions, Genetic
  • Zebrafish/genetics*
  • Zebrafish/metabolism
PubMed: 17576137 Full text @ Dev. Dyn.
The anterior segment of the eye includes such structures as the cornea, lens, iris, and ciliary body and is essential for many visual and physiological functions of the eye. The zebrafish gelsolin-like 1 (gsnl1) gene encodes an actin regulatory protein and is expressed in the anterior segment of the eye. We report the transgenic analyses of the gsnl1 promoter and enhancer that are required for expression in the anterior segment of the eye. A 6.4-kb genomic fragment upstream from the translation initiation site (ATG) was capable of driving green fluorescent protein (GFP) expression in transient transgenic embryos and stable transgenic adult fish, which mimics the endogenous gsnl1 expression. The GFP expression was localized in the corneal epithelium (CE) and the annular ligament (AL) at the iridocorneal angle. A unique enhancer for each of these two tissues was identified at 3.7-kb upstream from the ATG. The 60-bp AL and 25-bp CE enhancers were separated by 100-bp and functioned independently from each other. Deletion analysis indicated that the proximal promoter was located 1.6-kb upstream from the ATG. Stable GFP transgenic lines were established for future studies of genetic regulation in the anterior segment of the fish eye.