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Comparative Study
. 1981 Nov 25;9(22):6001-15.
doi: 10.1093/nar/9.22.6001.

Clustering and methylation of repeated DNA: persistence in avian development and evolution

D A Sobieski, F C Eden
Comparative Study

Clustering and methylation of repeated DNA: persistence in avian development and evolution

D A Sobieski et al. Nucleic Acids Res. .

Abstract

In the chicken genome, clusters of repeated DNA sequences occur which have alternate arrangements of the component sequence elements. Many of these clustered, repeated sequences are extensively methylated. We have established that both their arrangement and their methylation are invariant regardless of the source of chicken DNA. Comparisons included DNA from sperm, from a series of embryonic stages, from tissues of single adult individuals, and from thirty individual chickens of two strains. These same sequences are found in the DNA of some avian species related to chickens, and there they show the same clustered, methylated form. In related species, some of the arrangements found in chicken DNA are different or missing.

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