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THE PLANT CELL, Vol 1, Issue 4 415-425, Copyright © 1989 by American Society of Plant Biologists
Soybean [beta]-Conglycinin Genes Are Clustered in Several DNA Regions and Are Regulated by Transcriptional and Posttranscriptional Processes
J. J. Harada, S. J. Barker and R. B. Goldberg
Department of Biology, University of California, Los Angeles, California 90024-1606
We investigated the chromosomal organization and developmental regulation
of soybean [beta]-conglycinin genes. The [beta]-conglycinin gene family
contains at least 15 members divided into two major groups encoding
2.5-kilobase and 1.7-kilobase embryo mRNAs. [beta]-Conglycinin genes are
clustered in several DNA regions and are highly homologous along their
entire lengths. The two groups differ by the presence or absence of
specific DNA segments. These DNA segments account for the size differences
in [beta]-conglycinin mRNAs. The 2.5-kilobase and 1.7-kilobase
[beta]-conglycinin mRNAs accumulate and decay at different times during
embryogenesis. By contrast, genes encoding these mRNAs are
transcriptionally activated and repressed at the same time periods. Our
studies indicate that the [beta]-conglycinin family evolved by both
duplication and insertion/deletion events, and that [beta]-conglycinin gene
expression is regulated at both the transcriptional and posttranscriptional
levels.
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