PT - JOURNAL ARTICLE AU - Gerard M. J. Beaudoin III AU - Claude M. Schofield AU - Tulip Nuwal AU - Keling Zang AU - Erik M. Ullian AU - Bo Huang AU - Louis F. Reichardt TI - Afadin, A Ras/Rap Effector That Controls Cadherin Function, Promotes Spine and Excitatory Synapse Density in the Hippocampus AID - 10.1523/JNEUROSCI.4565-11.2012 DP - 2012 Jan 04 TA - The Journal of Neuroscience PG - 99--110 VI - 32 IP - 1 4099 - http://www.jneurosci.org/content/32/1/99.short 4100 - http://www.jneurosci.org/content/32/1/99.full SO - J. Neurosci.2012 Jan 04; 32 AB - Many molecules regulate synaptogenesis, but intracellular signaling pathways required for their functions are poorly understood. Afadin is a Rap-regulated, actin-binding protein that promotes cadherin complex assembly as well as binding many other cell adhesion molecules and receptors. To examine its role in mediating synaptogenesis, we deleted afadin (mllt1), using a conditional allele, in postmitotic hippocampal neurons. Consistent with its role in promoting cadherin recruitment, afadin deletion resulted in 70% fewer and less intense N-cadherin puncta with similar reductions of β-catenin and αN-catenin puncta densities and 35% reduction in EphB2 puncta density. Its absence also resulted in 40% decreases in spine and excitatory synapse densities in the stratum radiatum of CA1, as determined by morphology, apposition of presynaptic and postsynaptic markers, and synaptic transmission. The remaining synapses appeared to function normally. Thus, afadin is a key intracellular signaling molecule for cadherin recruitment and is necessary for spine and synapse formation in vivo.