A forward genetic screen in mice identifies Sema3A(K108N), which binds to neuropilin-1 but cannot signal.

ABSTRACT: We have performed a three-generation, forward genetic screen to identify recessive mutations that affect the patterning of the peripheral nervous system. Using this assay, we identified Sema3A(K108N), a novel loss-of-function allele of Sema3A. Class 3 semaphorins, which include Sema3A, are structurally conserved secreted proteins that play critical roles in the development and function of the nervous system. Sema3A(K108N) mutant mice phenocopy Sema3A-null mice, and Sema3A(K108N) protein fails to repel or collapse DRG axons in vitro. K108 is conserved among semaphorins, yet the loss-of-function effects associated with K108N are not the result of impaired expression, secretion, or binding of Sema3A to its high-affinity receptor Neuropilin-1 (Npn-1). Using in silico modeling and mutagenesis o

SUBMITTER: Merte J 

PROVIDER: S-EPMC2869466 | biostudies-literature | 2010 Apr

REPOSITORIES: biostudies-literature