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Gli3 and Plzf cooperate in proximal limb patterning at early stages of limb development


The vertebrate limb initially develops as a bud of mesenchymal cells that subsequently aggregate in a proximal to distal (P–D) sequence to give rise to cartilage condensations that prefigure all limb skeletal components1. Of the three cardinal limb axes, the mechanisms that lead to establishment and patterning of skeletal elements along the P–D axis are the least understood. Here we identify a genetic interaction between Gli3 (GLI-Kruppel family member 3) and Plzf (promyelocytic leukaemia zinc finger, also known as Zbtb16 and Zfp145), which is required specifically at very early stages of limb development for all proximal cartilage condensations in the hindlimb (femur, tibia, fibula). Notably, distal condensations comprising the foot are relatively unperturbed in Gli3-/-;Plzf-/- mouse embryos. We demonstrate that the cooperative activity of Gli3 and Plzf establishes the correct temporal and spatial distribution of chondrocyte progenitors in the proximal limb-bud independently of known P–D patterning markers and overall limb-bud size. Moreover, the limb defects in Gli3-/-;Plzf-/- embryos correlate with the transient death of a specific subset of proximal mesenchymal cells that express bone morphogenetic protein receptor, type 1B (Bmpr1b) at the onset of limb development. These findings suggest that the development of proximal and distal skeletal elements is distinctly regulated early during limb-bud formation. The initial division of the vertebrate limb into two distinct molecular domains is consistent with fossil evidence indicating that the upper and lower extremities of the limb have different evolutionary origins2.

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Figure 1: Plzf and Gli3 regulate proximal skeletal patterning.
Figure 2: Plzf and Gli3 regulate molecular and morphological features of the proximal stylopod and zeugopod.
Figure 3: Plzf and Gli3 are for required for proximal limb condensations.
Figure 4: Cellular consequences of Plzf and Gli3 loss of function.


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We thank our laboratory staff, in particular S. Weatherbee and I. Zohn, for discussions; D. Ruggero for suggestions and support; and Y. Yang for discussions on joint formation. We thank Y. Yang, C. Tabin, D. Kingsley, A. Boulet, M. Capecchi and B. de Crombrugghe for in situ hybridization probes. This work was supported by the NIH (L.N.) and by a MSKCC Cancer Center Support grant. L.N. is an Investigator of the Howard Hughes Medical Institute.

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Correspondence to Lee Niswander.

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Supplementary information

Supplementary Figure S1

Limb skeletal phenotypes in mutant mice. (JPG 643 kb)

Supplementary Figure S2

Expression of joint and tendon markers in WT and Plzf-/-;Gli3-/- limbs. (JPG 313 kb)

Supplementary Figure S3

Histology of Plzf-/-;Gli3-/- hindlimb sections at E12.0 stained with hematoxylin and eosin. (JPG 679 kb)

Supplementary Figure S4

Expression of AER and A-P patterning genes in WT and Plzf-/-;Gli3-/- embryos. (JPG 524 kb)

Supplementary Figure S5

Expression of P-D patterning genes in Plzf-/-;Gli3-/- embryos. (JPG 535 kb)

Supplementary Figure S6

BMPR1B expression in the E10.5 limb. RNA in situ hybridization for BMPR1B on WT forelimb and hindlimb sections. (JPG 311 kb)

Supplementary Figure Legends S1-S6 (DOC 23 kb)

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Barna, M., Pandolfi, P. & Niswander, L. Gli3 and Plzf cooperate in proximal limb patterning at early stages of limb development. Nature 436, 277–281 (2005).

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