- Autosomal dominant pseudohypoparathyroidism type Ib is associated with a heterozygous microdeletion that likely disrupts a putative imprinting control element of GNAS. Bastepe, M., Fröhlich, L.F., Hendy, G.N., Indridason, O.S., Josse, R.G., Koshiyama, H., Körkkö, J., Nakamoto, J.M., Rosenbloom, A.L., Slyper, A.H., Sugimoto, T., Tsatsoulis, A., Crawford, J.D., Jüppner, H. J. Clin. Invest. (2003)