Abstract
Congenital hydrocephalus is a common birth-defect whose developmental origins are poorly understood. Pax3-null mutants show defects in myogenesis, neural tube closure, neural crest morphogenesis, and heart development that, consequently, results in embryonic lethality. Here we demonstrate that conditional deletion of the mouse Pax3 transcription factor results in fully-penetrant congenital obstructive hydrocephalus. To identify the role of Pax3 during cranial development, we deleted Pax3 within the neuroepithelium (via Pax7−Cre), in the neural crest (via P0-Cre), and in both the neuroepithelium and the neural crest (via Wnt1-Cre). Only conditional mutants generated using Pax7−Cre or Wnt1-Cre developed early onset congenital hydrocephalus due to stenosis of the third ventricle, suggesting that loss of neuroepithelial Pax3 is sufficient to disturb third ventricle morphogenesis. Dilation of lateral ventricles occurs as early as E14.5, and lineage-mapping revealed that the neuroepithelial cells in the conditional mutants are present, but fail to undergo normal differentiation at the stenotic site. Concomitant with a narrowing of the mutant third ventricle, we detected ectopic apoptosis, reduced proliferation, and abnormal β-catenin localization. Furthermore, consistent with the overlapping expression pattern of Pax3 and Pax7 in early cranial neuroepithelium, we demonstrated a combinatorial role, as compound Pax3/Pax7 heterozygotes display partially-penetrant congenital hydrocephalus. These murine data provide an experimental paradigm underpinning clinical observations of the presence of PAX3 mutations in some hydrocephalic patients.
Highlights
Pax3 is a transcription factor expressed in the neural tube, neural crest (NC), and somites during early embryogenesis
We show that simultaneous heterozygous mutation of Pax7, a Pax3 paralog, induces hydrocephalus in compound heterozygous
Pax3 f lox{ f lox /Wnt1-Cre mice were born at the expected Mendelian ratio, but all died within 30 days of birth (n = 50/50)
Summary
Pax is a transcription factor expressed in the neural tube, neural crest (NC), and somites during early embryogenesis. The importance of Pax is well established by the in utero and neonatal death of Pax homozygous mutants [1,2] or hypomorphs [3] with an 80% reduction of Pax expression. This early death and the associated composite structural defects hinders our understanding of the functional role Pax plays in any given tissue/organ, especially subsequent defects which might not manifest until postnatal life [1,2,3,4]. Deficiency of Pax leads to failed neural tube closure, resulting in exencephally which disrupts cranial development.
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