Mesh hole after uv mapping

hello i have imported a sphere out of an external 3d modelling programm(wings 3d). but a sphere has to cut before uv mapping. in my game i move the triangles of the sphere. when i export the sphere without uv, all is right, but with uv the sphere has a hole at the uv cut when i move the triangles. how can i connect this point? or how can i give the sphere a texture without uv mapping?

here is a picture of the hole