PMID- 8978613 OWN - NLM STAT- MEDLINE DCOM- 19970128 LR - 20190705 IS - 0092-8674 (Print) IS - 0092-8674 (Linking) VI - 87 IP - 6 DP - 1996 Dec 13 TI - branchless encodes a Drosophila FGF homolog that controls tracheal cell migration and the pattern of branching. PG - 1091-101 AB - The molecular basis for patterning of complex organ structures like the lung and insect tracheal system is unknown. Here, we describe the Drosophila gene branchless (bnl) and demonstrate that it is a key determinant of the tracheal branching pattern. bnl is required for tracheal branching and is expressed dynamically in clusters of cells surrounding the developing tracheal system at each position where a new branch will form and grow out. Localized misexpression of bnl can direct branch formation and outgrowth to new positions. Generalized misexpression activates later programs of tracheal gene expression and branching, resulting in massive networks of branches. bnl encodes a homolog of mammalian fibroblast growth factors (FGFs) and appears to function as a ligand for the breathless receptor tyrosine kinase, an FGF receptor homolog expressed on developing tracheal cells. The results suggest that this FGF pathway specifies the tracheal branching pattern by guiding tracheal cell migration during primary branch formation and then activating later programs of finer branching at the ends of growing primary branches. FAU - Sutherland, D AU - Sutherland D AD - Department of Biochemistry, Beckman Center, Stanford University School of Medicine, California 94305-5307, USA. FAU - Samakovlis, C AU - Samakovlis C FAU - Krasnow, M A AU - Krasnow MA LA - eng SI - GENBANK/U82273 PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Research Support, U.S. Gov't, Non-P.H.S. PT - Research Support, U.S. Gov't, P.H.S. PL - United States TA - Cell JT - Cell JID - 0413066 RN - 0 (DNA, Complementary) RN - 0 (Drosophila Proteins) RN - 0 (Insect Proteins) RN - 0 (Receptors, Fibroblast Growth Factor) RN - 0 (bnl protein, Drosophila) RN - 62031-54-3 (Fibroblast Growth Factors) SB - IM MH - Animals MH - Base Sequence MH - Cell Movement/physiology MH - DNA, Complementary/genetics MH - Drosophila/*genetics MH - *Drosophila Proteins MH - Fibroblast Growth Factors/*genetics MH - Gene Expression Regulation, Developmental/physiology MH - Genes, Insect/physiology MH - Insect Proteins/*genetics MH - Larva/genetics MH - Molecular Sequence Data MH - Phenotype MH - Receptors, Fibroblast Growth Factor/physiology MH - Sequence Homology, Amino Acid MH - Signal Transduction/physiology MH - Trachea/cytology/embryology EDAT- 1996/12/13 00:00 MHDA- 1996/12/13 00:01 CRDT- 1996/12/13 00:00 PHST- 1996/12/13 00:00 [pubmed] PHST- 1996/12/13 00:01 [medline] PHST- 1996/12/13 00:00 [entrez] AID - S0092-8674(00)81803-6 [pii] AID - 10.1016/s0092-8674(00)81803-6 [doi] PST - ppublish SO - Cell. 1996 Dec 13;87(6):1091-101. doi: 10.1016/s0092-8674(00)81803-6.