[The development of zebrafish research in China].

As one of the most important vertebrate model systems, the zebrafish plays increasingly important roles in the field of life sciences. At present, zebrafish is widely used in studies on developmental biology, molecular biology, cell biology, genetics, neurobiology, oncology, immunology, marine biology, pharmacology, toxicology, and environmental protection. The zebrafish-based studies have led to many important discoveries that contribute to the development of modern life sciences.

Negative regulation of TGF-beta signaling in development.

The TGF-beta superfamily members have important roles in controlling patterning and tissue formation in both invertebrates and vertebrates. Two types of signal transducers, receptors and Smads, mediate the signaling to regulate expression of their target genes. Despite of the relatively simple signal transduction pathway, many modulators have been found to contribute to a tight regulation of this pathway in a variety of mechanisms.

[The shh promoter of zebrafish directs the expression of GFP in notochord].

In vitro experiment showed that HNF3beta was the direct regulator of sonic hedgehog (shh) promoter. To investigate the activity of zebrafish shh promoter in vivo, we constructed the expression vector pShh-EGFP with ligating a 538 bp zebrafish shh promoter,which contained two HNF3beta binding sites, to EGFP. The pShh-EGFP DNA was microinjected into one-cell stage embryos of the zebrafish and the embryos were observed for GFP expression with fluorescent microscopy.