Postaxial polydactyly is the duplication of the fifth digit and includes supernumerary digits that are fully developed with bone and neural tissue (type A) or that are attached only by soft tissue (type B). On examination in the neonatal unit, postaxial type B polydactyly was discovered on both of the newborn's hands.
In this regard, what gene causes polydactyly?
More than 40 mutations in the GLI3 gene have been found to cause Pallister-Hall syndrome, a rare condition whose major features include polydactyly, an abnormal growth in the brain called a hypothalamic hamartoma, and a malformation of the airway called a bifid epiglottis.
Subsequently, question is, what are the main symptoms of polydactyly?
Symptoms. The main symptom of polydactyly is an extra finger or toe. The condition can range from a small extra bump on the side of the hand to a finger that widens to end in two fingertips, an extra finger that dangles by a thin cord from the hand or a hand that has a thumb and five fingers.
Is polydactyly a genetic disorder?
Polydactyly may be passed down in families. This trait involves only one gene that can cause several variations. African Americans, more than other ethnic groups, can inherit a 6th finger. In most cases, this is not caused by a genetic disease.
What race is polydactyly most common in?
Isolated preaxial polydactyly in the hand is more common in Caucasians compared to African Americans, and has a high incidence in the Native American and Asian populations.