spontaneous mutation


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Related to spontaneous mutation: induced mutation

spontaneous mutation

[spän′tā·nē·əs myü′tā·shən]
(genetics)
A mutation that occurs spontaneously, that is, in an individual not specifically exposed to a known mutagen.
References in periodicals archive ?
Scientists use the term spontaneous mutation when this happens.
Although it is passed down from parents to children, about 1/3 of cases are caused by a spontaneous mutation, a change in a gene, he added.
and It long "When she was about three to four months, I became aware that she wasn't meeting her targets in development and I had to come to terms with her having a disability, which was recently diagnosed as a spontaneous mutation in one of her genes.
Applied since the 1930s to accelerate the process of developing and selecting new valuable agronomic traits, mutation breeding uses a plants own genetic make-up, mimicking the natural process of spontaneous mutation. The mutation process generates random genetic variations, resulting in plants with new and useful traits.
Study shows high frequency of spontaneous mutation in Ebola virus.
EB can be inherited, arise through a spontaneous mutation or, more rarely, can be acquired as the result of autoimmune disease.
In humans, Sirenomelia may be an autosomal dominant genetic condition and every single case is caused by a new spontaneous mutation. So the condition may be the result of combined genetic and environmental component.
(2) /3rd of all case mutations are inherited from mother while the rest occur as a result of spontaneous mutation in egg/zygote.(AIS support group UK 1999).
Considered a genetic disorder, 70% of the cases have a familial/genetic link, while 30% appear to be by spontaneous mutation. Duchenne is typically diagnosed between 3 and 7 years of age, with the mean year of diagnosis around the age of 5.
A positive family history may be elicited in only about 50 percent patients, rest of cases are due to spontaneous mutation of the loricrin gene.
The three separate cases in Denmark, Japan, and Hong Kong appear to have the same spontaneous mutation but do not appear to have reassorted with seasonal influenza viruses, he said.

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