RAS-Guanine nucleotide exchange factor (GEF) that controls the negative regulation of neuronal dendrite growth by mediating a signaling pathway linking RAS and MAP2 (PubMed:17984326, PubMed:21385318). May be involved in cellular senescence (By similarity). Interacts (via KIND2) with MAP2; the interaction enhances MAP2 phosphorylation and localizes KNDC1 to dendrites. Highly expressed in the brain and at low levels in the ovary. In the brain it is most prominently expressed in the cerebellum where it is restricted to the granular Purkinje cell layer. At 14.5 dpc, highly expressed in the mid- and hindbrain and only weakly in the forebrain, but during development the main expression shifts towards the telencephalon as seen at 17.5 dpc (PubMed:16099729). In cerebellum expression is highly up-regulated between postnatal days P7 and P12. At P7, low expression levels throughout the brain, but high in hippocampus, thalamus and the cerebellar white matter (PubMed:17984326).