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THE PLANT CELL, Vol 7, Issue 10 1667-1680, Copyright © 1995 by American Society of Plant Biologists
Matrix Attachment Regions and Transcribed Sequences within a Long Chromosomal Continuum Containing Maize Adh1
Z. Avramova, P. SanMiguel, E. Georgieva and J. L. Bennetzen
Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907
We provide evidence for the location of matrix attachment sites along a
contiguous region of 280 kb on maize chromosome 1. We define nine potential
loops that vary in length from 6 kb to >75 kb. The distribution of the
different classes of DNA within this continuum with respect to the
predicted structural loops reveals an interesting correlation: the long
stretches of mixed classes of highly repetitive DNAs are often segregated
into topologically sequestered units, whereas low-copy-number DNAs
(including the alcohol dehydrogenase1 [adh1] gene) are positioned in
separate loops. Contrary to expectations, several classes of highly
repeated elements with representatives in this region were found to be
transcribed, and some of these exhibited tissue-specific patterns of
expression.
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