- The gamma-aminobutyric acid receptor gamma 3 subunit gene (GABRG3) is tightly linked to the alpha 5 subunit gene (GABRA5) on human chromosome 15q11-q13 and is transcribed in the same orientation. Greger, V., Knoll, J.H., Woolf, E., Glatt, K., Tyndale, R.F., DeLorey, T.M., Olsen, R.W., Tobin, A.J., Sikela, J.M., Nakatsu, Y. Genomics (1995)