What it means to have a mutation and what role mutations play in Huntington’s disease.
Another Theory...
It was mentioned in Part 3 that most researchers believe that expansion occurs during mitosis instead of meiosis. However, a very recent study suggests that expansion does not occur in either of these settings. The study found that instead, expansion occurs in sperm while they reside in the male epididymis, which is where the sperm undergo their final maturation. Thus, instead of during mitosis or meiosis, the researchers believe that expansions occur in the final maturation of sperm. However, this is very new research and it will take many more studies before the research community is convinced that sperm maturation, rather than mitosis, is when expansion occurs.
Last Modified: 1-28-04
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