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Dev Cell. 2016 Apr 18;37(2):127-35. doi: 10.1016/j.devcel.2016.03.024.

Scaling Pattern to Variations in Size during Development of the Vertebrate Neural Tube.

Author information

1
Department of Genetics, Harvard Medical School, 77 Avenue Louis Pasteur, Boston, MA 02115, USA.
2
Mill Hill Laboratory, The Francis Crick Institute, London NW7 1AA, UK.
3
Department of Genetics, Harvard Medical School, 77 Avenue Louis Pasteur, Boston, MA 02115, USA. Electronic address: tabin@genetics.med.harvard.edu.

Abstract

Anatomical proportions are robustly maintained in individuals that vary enormously in size, both within a species and between members of related taxa. However, the mechanisms underlying scaling are still poorly understood. We have examined this phenomenon in the context of the patterning of the ventral neural tube in response to a gradient of the morphogen Sonic hedgehog (SHH) in the chick and zebra finch, two species that differ in size during the time of neural tube patterning. We find that scaling is achieved, at least in part, by altering the sensitivity of the target cells to SHH and appears to be achieved by modulating the ratio of the repressive and activating transcriptional regulators, GLI2 and GLI3. This mechanism contrasts with previous experimental and theoretical analyses of morphogenic scaling that have focused on compensatory changes in the morphogen gradient itself.

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PMID:
27093082
PMCID:
PMC4854284
DOI:
10.1016/j.devcel.2016.03.024
[Indexed for MEDLINE]
Free PMC Article

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