- Further mutations in Brain 4 (POU3F4) clarify the phenotype in the X-linked deafness, DFN3. Bitner-Glindzicz, M., Turnpenny, P., Höglund, P., Kääriäinen, H., Sankila, E.M., van der Maarel, S.M., de Kok, Y.J., Ropers, H.H., Cremers, F.P., Pembrey, M. Hum. Mol. Genet. (1995)