Birth order and the genetics of amyotrophic lateral sclerosis.

Abstract excerpt

The cause of ALS remains largely unknown for the 90% with no known family history, but spontaneous mutation to risk alleles of as yet unidentified genes is possible. It has long been recognized that genetic diseases may be more likely to occur in the last born children of a sibship because increased paternal age is associated with an increased spontaneous point mutation rate in sperm. To test the hypothesis that...

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