BMP5
- Generally, brachymesophalangia is a condition in which the middle phalanx is shorter than the distal phalanx. The fifth finger is the most common occurrence. The frequency of occurrence is about 1% in Caucasians and Negroes, but in Japanese, it occurs at a high frequency of 14% in males and 21% in females. Family history research has shown that it is caused by an autosomal irregular dominant gene with incomplete penetrance. It also occurs at a high rate in children with Down syndrome.
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