Im pretty sure that if they had the autoflowering gene, they would be labeled autoflowering.
Supposedly Dr Greenthumbs Iranian Autoflower can be vegged indefinitely under 24 hour light and cloned. but if you grow it under anything but 24 hour light it will begin to flower. I have not personally tried. But thats what I read from a few different people.
BUT, like most things on the internet you need to take it with a grain of salt because a lot of stuff, espescially MJ stuff on the net is garbage.