The Possibility of Branch Conformation in Azotobacter Vinelandii Chromosomal DNA Carrying Multiple Gene Copies and Its Folded State in the Cell Page: 57
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57
when the cells are growing. This is an erroneous premise since all
assays for gene number reported by Punita et aL were performed on
cultures in log phase or late log phase. Punita et aL should have
been compelled to compare gene number in cultures fixing nitrogen
which should give a multiplicity of 80 n according to their theory
and those grown on media with nitrogen where the gene number
should be 1 n. Since both cultures gave 1 n (Vela, unpublished data),
this theory must be said false.
How can these single-copy gene groups including. nif genes and
multiple-copy gene groups exist on the folded chromosomes of A.
vinelandii , in inherently stable form? Are they located on identical
chromosomes one gene copy per one chromosome as suggested by
Punita et al ? If so, are the nif genes present on only one specific
chromosome among many identical chromosomes all of which lack
nif genes? In the postulated model of this study, the nif genes are
placed on a large circular DNA, and other multi-copy genes are
placed on each member of multiple circular DNA segments, one gene
per one circular unit of large circular DNA carrying many other
"branch" loops (Figure 8). This configuration of chromosomal DNA is
reconciled with the results obtained in this study.
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Choi, Munhyeong. The Possibility of Branch Conformation in Azotobacter Vinelandii Chromosomal DNA Carrying Multiple Gene Copies and Its Folded State in the Cell, thesis or dissertation, August 1991; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc798271/m1/63/: accessed July 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .