The Ter mutation in the dead end gene causes germ cell loss and testicular germ cell tumours.
Youngren KK, Coveney D, Peng X, Bhattacharya C, Schmidt LS, Nickerson ML, Lamb BT, Deng JM, Behringer RR, Capel B, Rubin EM, Nadeau JH, Matin A. The Ter mutation in the dead end gene causes germ cell loss and testicular germ cell tumours. Nature. 2005 May 19; 435(7040):360-4.