A large number of human gene defects can cause ectrodactyly.

Over 4000 human diseases are caused by single gene defects.

In rare cases, a new gene defect occurs due to an unknown cause.

About 10 percent of cases run in families, linked to inherited gene defects.

Nor are there any biochemical markers for the gene defects.

There are two common gene defects in the population.

His group has found some specific mutations - gene defects - that have never before been seen in these two diseases.

In some cases, experts believe it may be a result of a gene defect on the X chromosome.

A gene defect on chromosome 21 was found in some Alzheimer's disease patients.

Genetic testing may be done to look for the gene defect associated with the syndrome.