What percentage of the population has polydactyly?
Polydactyly occurs in 1 in 1,000 births in the overall population, but occurs more often in African Americans with 1 in 150 births. It’s also more common in boys than girls. It is most often seen in the right hand and left foot, and typically affects the hands.
How common is polydactyly in UK?
During 2002, there were only eight newborns with polydactyly reported in the UK. When both parents were polydactyls, there was a 75% probability of polydactyly in the offspring. Heredity contributes to 15% of polydactyly causation.
What chromosome is polydactyly on?
Phenotype-Gene Relationships
| Location | Phenotype | Gene/Locus |
|---|---|---|
| 7p14.1 | Polydactyly, postaxial, types A1 and B | GLI3 |
What is the incidence of polydactyly in the UK?
Studies have found that when all types of polydactyly are put together, the incidence in black men and women is 13.5 per 1000 and 11.1 per 1000, respectively, and among caucasian men and women is 2.3 per 1000 and 0.6 per 1000, respectively. During 2002, there were only eight newborns with polydactyly reported in the UK.
Where is the extra digit of polydactyly located?
In preaxial polydactyly, the additional digit is present on the outside of the big toe or thumb. When present in the feet, the presence of the extra digit is known as tibial polydactyly. When present in the hand, it is known as radial polydactyly.
What are the three types of polydactyly of the hand?
The classification of polydactyly of the hand can be divided into radial, central, and ulnar polydactyly, referring to the anatomical location of the extra digit or part of a digit. 1,2 The incidence of polydactyly varies depending on the type of polydactyly and the studied population.
Are there any male to male transmission of polydactyly?
No male-to-male transmission of Polydactyly seems to have been documented. 10. In 2002, only 8 infants were born alive with Polydactyly in the United Kingdom. 11. There were three cases of abortions that occurred after the pregnancy was determined to include Polydactyly. 12. When it occurs spontaneously, it is a dominant trait.