The neural crest is a multipotent stem cell population that migrates long distances in vertebrate embryos and gives rise to a large number of essential cell types including neurons and glia of the peripheral nervous system, melanocytes, chromaffin cells of the adrenal gland, and most of the craniofacial skeleton. Neural crest cells undergo an epithelial to mesenchymal transition (EMT), and migrate from the dorsal neural tube and populate distant target sites where they give rise to these derivatives. The molecular mechanisms that direct the development and differentiation of neural crest cells remains poorly understood, however, a number of key transcriptional regulators of these processes have been identified. SoxE family transcription factors (Sox8, Sox9, and Sox10) are essential for several aspects of neural crest cell development, including the formation of the craniofacial skeleton. SoxE factors act reiteratively throughout neural crest development to promote the initial formation of neural crest cells, the maintenance of their stem cell state, and the differentiation of a subset of neural crest derivatives. One mechanism via which SoxE factors can be regulated is through the actions of a family of related Sox proteins, the SoxD proteins (Sox5/6/13). The SoxD family transcription factor Sox5 is expressed in early neural crest cells and in a subset of neural crest derivatives including skeletal tissue. Where it has been examined, Sox5 appears to function in part by modulating the activity of SoxE factors in a context dependant fashion;Sox5 can inhibit Sox10-dependent activation of melanocyte promoters but cooperates with Sox9 to drive transcription of chondrocyte target genes. I have found that Sox5 is expressed throughout many stages of neural crest development in Xenopus and that it plays essential roles in this important cell type. In this proposal I will build on these strong preliminary findings in order to better understand the role of Sox5 in regulating SoxE function during neural crest development. )

Public Health Relevance

Chondrogenesis is an essential vertebrate specific process that when improperly regulated can lead to skeletal malformation and birth defects causing a significant reduction in life expectancy. The craniofacial skeleton is derived from a special group of multipotent stem cells called the neural crest. SoxE transcription factors are key regulators of this cell type, and the proposed research will shed important light on their regulation and function.

National Institute of Health (NIH)
National Institute of Dental & Craniofacial Research (NIDCR)
Predoctoral Individual National Research Service Award (F31)
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NIDR Special Grants Review Committee (DSR)
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Frieden, Leslie A
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Northwestern University at Chicago
Schools of Arts and Sciences
United States
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Buitrago-Delgado, Elsy; Nordin, Kara; Rao, Anjali et al. (2015) NEURODEVELOPMENT. Shared regulatory programs suggest retention of blastula-stage potential in neural crest cells. Science 348:1332-5
Nordin, Kara; LaBonne, Carole (2014) Sox5 Is a DNA-binding cofactor for BMP R-Smads that directs target specificity during patterning of the early ectoderm. Dev Cell 31:374-382
Lander, Rachel; Nasr, Talia; Ochoa, Stacy D et al. (2013) Interactions between Twist and other core epithelial-mesenchymal transition factors are controlled by GSK3-mediated phosphorylation. Nat Commun 4:1542
Lee, Pei-Chih; Taylor-Jaffe, Kimberly M; Nordin, Kara M et al. (2012) SUMOylated SoxE factors recruit Grg4 and function as transcriptional repressors in the neural crest. J Cell Biol 198:799-813
Lander, Rachel; Nordin, Kara; LaBonne, Carole (2011) The F-box protein Ppa is a common regulator of core EMT factors Twist, Snail, Slug, and Sip1. J Cell Biol 194:17-25