title: Lineage-specific requirements of beta-catenin in neural crest development.
abstract: Beta-catenin plays a pivotal role in cadherin-mediated cell adhesion. Moreover, it is a downstream signaling component of Wnt that controls multiple developmental processes such as cell proliferation, apoptosis, and fate decisions. To study the role of beta-catenin in neural crest development, we used the Cre/loxP system to ablate beta-catenin specifically in neural crest stem cells. Although several neural crest-derived structures develop normally, mutant animals lack melanocytes and dorsal root ganglia (DRG). In vivo and in vitro analyses revealed that mutant neural crest cells emigrate but fail to generate an early wave of sensory neurogenesis that is normally marked by the transcription factor neurogenin (ngn) 2. This indicates a role of beta-catenin in premigratory or early migratory neural crest and points to heterogeneity of neural crest cells at the earliest stages of crest development. In addition, migratory neural crest cells lateral to the neural tube do not aggregate to form DRG and are unable to produce a later wave of sensory neurogenesis usually marked by the transcription factor ngn1. We propose that the requirement of beta-catenin for the specification of melanocytes and sensory neuronal lineages reflects roles of beta-catenin both in Wnt signaling and in mediating cell-cell interactions.
authors.affiliation: Institute of Cell Biology, Department of Biology, Swiss Federal Institute of Technology, CH-8093 Zurich, Switzerland.
authors.forename: Lisette
authors.initials: L
authors.lastname: Hari
authors.forename: Véronique
authors.initials: V
authors.lastname: Brault
authors.forename: Maurice
authors.initials: M
authors.lastname: Kléber
authors.forename: Hye-Youn
authors.initials: HY
authors.lastname: Lee
authors.forename: Fabian
authors.initials: F
authors.lastname: Ille
authors.forename: Rainer
authors.initials: R
authors.lastname: Leimeroth
authors.forename: Christian
authors.initials: C
authors.lastname: Paratore
authors.forename: Ueli
authors.initials: U
authors.lastname: Suter
authors.forename: Rolf
authors.initials: R
authors.lastname: Kemler
authors.forename: Lukas
authors.initials: L
authors.lastname: Sommer
mesh_terms: D000818:Animals; D051792:Basic Helix-Loop-Helix Proteins; D015415:Biomarkers / Q000032:analysis; D002450:Cell Communication; D002454:Cell Differentiation; D019070:Cell Lineage; D002478:Cells, Cultured; D003433:Crosses, Genetic; D003598:Cytoskeletal Proteins / Q000235:genetics / Q000502:physiology*; D005727:Ganglia, Spinal / Q000166:cytology / Q000196:embryology; D018507:Gene Expression Regulation, Developmental; D020868:Gene Silencing; D018257:Helix-Loop-Helix Motifs; D008544:Melanocytes / Q000166:cytology; D051379:Mice; D008817:Mice, Mutant Strains; D008954:Models, Biological; D009419:Nerve Tissue Proteins / Q000378:metabolism; D009432:Neural Crest / Q000166:cytology / Q000196:embryology* / Q000502:physiology; D009457:Neuroglia / Q000166:cytology; D009474:Neurons / Q000166:cytology; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D011995:Recombination, Genetic; D013234:Stem Cells / Q000166:cytology / Q000502:physiology; D015534:Trans-Activators / Q000235:genetics / Q000502:physiology*; D051176:beta Catenin
chemical_list: D051792:Basic Helix-Loop-Helix Proteins; D015415:Biomarkers; D003598:Cytoskeletal Proteins; D009419:Nerve Tissue Proteins; D012333:RNA, Messenger; D015534:Trans-Activators; D051176:beta Catenin; C495267:CTNNB1 protein, mouse; C102938:Neurog2 protein, mouse