Expressed very weakly in heart, liver, skeletal muscle, kidney, pancreas and fetal kidney. Not detected in brain, placenta and lung. A chromosomal aberration involving MIPOL1 is found in a patient with mirror-image polydactyly of hands and feet without other anomalies (MIP). Translocation t(2;14)(p23.3;q13). MIP is a very rare congenital anomaly characterized by mirror-image duplication of digits. MIP is occasionally associated with dimelia of the ulna and fibula, tibial and/or fibular hypoplasia, nasal abnormality and other malformations. Most MIP cases are sporadic, but very rare parent-child transmissions observed in familial cases suggest an autosomal mode of inheritance. May be due to a competing acceptor splice site.