Probably interacts with ABI3. Expressed in brain, heart, lung, liver, pancreas kidney and placenta. Defects in ABI3BP has been found in a patient with isolated coloboma, a defect of the eye characterized by the absence of ocular structures due to abnormal morphogenesis of the optic cup and stalk, and the fusion of the fetal fissure (optic fissure). Isolated colobomas may be associated with an abnormally small eye (microphthalmia) or small cornea. Extended N-terminus. Extended N-terminus.