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SLIT-ROBO Rho GTPase-activating protein 2 (srGAP2) also known as formin-binding protein 2 (FNBP2) is a protein that in humans is encoded by the ''SRGAP2'' gene. SRGAP2 is involved in neuronal migration and neuronal differentiation. SRGAP2 also plays a critical role in synaptic development. SRGAP2C slows maturation of some neurons and increases neuronal spine density. Downregulation of srGAP2 inhibits cell-cell repulsion and enhances cell-cell contact duration. == Gene duplication in humans == This gene is one of the 23 genes that are duplicated in humans but not in other primates. This protein in humans has been duplicated three times in the human genome in the past 3.4 million years, one duplication 3.4 million years ago (mya) called SRGAP2B, a second duplication 2.4 mya (called SRGAP2C) and one final duplication ~1 mya (SRGAP2D). The ancestral gene SRGAP2 is found in all mammals and the human copy has been renamed SRGAP2A. The 2.4 million year-old duplication (SRGAP2C) expresses a shortened version that 100% of humans possess. This shortened version SRGAP2C inhibits the function of the ancestral copy SRGAP2A and (1) allows faster migration of neurons by interfering with filopodia production and (2) slows the rate of synaptic maturation and increases the density of synapses in the cerebral cortex.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「SRGAP2」の詳細全文を読む スポンサード リンク
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