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1. Although three major types of epigenetic modifications have been identified, specific environmental or nongenetic factors...

1. Although three major types of epigenetic modifications have been identified, specific environmental or nongenetic factors can cause epigenetic modifications. Identical twins have essentially the same DNA sequences; however, aging and significant lifestyle differences cause changes in:

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types of epigenetic modifications

> DNA modification
> histone modification
> Microribonucleic acids (miRNAs) or mature miRNAs
> specific environmental or non genetic factors, such as diet and exposure to certain chemicals can affect epigenetic

>compare methylation and other signatures of epigenetic modification in identical (monozygotic) twin pairs, because their DNA sequences are essentially the same As twins age, differences increase in methylation patterns of the DNA sequences of somatic cells

DNA methylation
> accumulated large numbers of differences in methylation pattens.
> Became different as a result of epigenetic changes, which in turn affect gene expression
> finding generated in animal studies suggest that changes in epigenetic patterns may be an important part of the aging process

Nightingale answered 2 years ago
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