Assessment
Questionnaire

Have a symptom?
See what questions
a doctor would ask.
 
Articles » Genetics Center » Sporadic Genetic Diseases
 

Sporadic Genetic Diseases

Although most genetic diseases are inherited from parents, this is not always the case. When a genetic disease occurs without any family history or genetic defects in the parents, the disease is called a sporadic genetic disease.

The cause of these diseases is usually a random mutations in gene in the DNA that occurred somewhere in the development of the fetus. This is presumably how the diseases arose in the first place throughout history.

It is more common for a sporadic disease to be a dominant genetic disease. The obvious reason is that a dominant disease requires only one random mutation, whereas two identically located mutations are required for recessive diseases. Hence, a random mutation is more likely to make a person a "carrier" of a recessive disease than actually give them the disease.

By this method of random DNA mutations, rare cases of genetic diseases are possible even if neither parent has any genetic history of the particular disease. In such cases, the risk of a reoccurrence in a second child is very low, but genetic testing is required to check whether the parents really do not have the genetic condition.

 

By using this site you agree to our Terms of Use. Information provided on this site is for informational purposes only; it is not intended as a substitute for advice from your own medical team. The information on this site is not to be used for diagnosing or treating any health concerns you may have - please contact your physician or health care professional for all your medical needs. Please see our Terms of Use.

Home | Symptoms | Diseases | Diagnosis | Videos | Tools | Forum | About Us | Terms of Use | Privacy Policy | Site Map | Advertise