Non-stringent tissue-source requirements for BMP ligand expression in regulation of body size inCaenorhabditis elegans

Genetical Research - Tập 93 Số 6 - Trang 427-432 - 2011
Cathy Savage‐Dunn1, Ling Yu1, KWESI GILL1, Muhammad Uzair Awan1, Thilini R. Fernando1
1Department of Biology, Queens College, City University of New York, Flushing, NY 11367, USA#TAB#

Tóm tắt

SummaryInCaenorhabditis elegans, the Bone Morphogenetic Protein (BMP)-related ligand Dpp- and BMP-like-1 (DBL-1) regulates body size by promoting the larval and adult growth of the large epidermal syncytium hyp7 without affecting cell division. This system provides an excellent model for dissecting the growth-promoting activities of BMP ligands, since in this context the growth and differentiation functions of DBL-1 are naturally uncoupled.dbl-1is expressed primarily in neurons and the DBL-1 ligand signals to its receptors and Smad signal transducers in the target tissue of the epidermis. The requirements constraining the source(s) of DBL-1, however, have not previously been investigated. We show here thatdbl-1expression requirements are strikingly relaxed. Expression in non-overlapping subsets of the endogenous expression pattern, as well as ectopic expression, can provide sufficient levels of activity for rescue of the small body size ofdbl-1mutants. By analysingdbl-1expression levels in transgenic strains with different degrees of rescue, we corroborate the model that DBL-1 is a dose-dependent regulator of growth. We conclude that, for body size regulation, the site of expression ofdbl-1is less important than the level of expression.

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Tài liệu tham khảo

10.1006/dbio.2001.0443

10.1038/381387a0

Wang, 2002, The expression of TGFbeta signal transducers in the hypodermis regulates body size in C. elegans, Development, 129, 4989, 10.1242/dev.129.21.4989

10.1073/pnas.2133476100

10.1126/science.3201241

Okkema, 1993, Sequence requirements for myosin gene expression and regulation in Caenorhabditis elegans, Genetics, 135, 385, 10.1093/genetics/135.2.385

10.1038/ni.1700

10.1038/ng.122

10.1038/387083a0

10.1038/ng1783

10.1006/dbio.2000.9713

Suzuki, 1999, A BMP homolog acts as a dose-dependent regulator of body size and male tail patterning in Caenorhabditis elegans, Development, 126, 241, 10.1242/dev.126.2.241

10.1016/S0092-8674(00)81114-9

10.1073/pnas.94.23.12457

10.1038/ng0396-315

10.1002/ajmg.10777

10.1038/ng.125

Mello, 1991, Efficient gene transfer in C. elegans: extrachromosomal maintenance and integration of transforming sequences, EMBO J, 10, 3959, 10.1002/j.1460-2075.1991.tb04966.x

10.1038/ng.121

10.1006/dbio.1999.9545

10.1016/j.devcel.2004.05.004

10.1080/08977190412331279890

10.1002/gene.10184

Burke, 1996, Dpp receptors are autonomously required for cell proliferation in the entire developing Drosophila wing, Development, 122, 2261, 10.1242/dev.122.7.2261

Savage-Dunn, September 9,, TGF-beta signaling, WormBook

Miller, 1995, Expression of the unc-4 homeoprotein in Caenorhabditis elegans motor neurons specifies presynaptic input, Development, 121, 2877, 10.1242/dev.121.9.2877

10.1242/dev.00863