PMID: 9192656Jun 24, 1997Paper

The distribution of genes in the genomes of Gramineae

Proceedings of the National Academy of Sciences of the United States of America
A BarakatG Bernardi

Abstract

Recent investigations showed that most maize genes are present in compositional fractions of nuclear DNA that cover only a 1-2% GC (molar fraction of guanosine plus cytosine in DNA) range and represent only 10-20% of the genome. These fractions, which correspond to compositional genome compartments that are distributed on all chromosomes, were collectively called the "gene space." Outside the gene space, the maize genome appears to contain no genes, except for some zein genes and for ribosomal genes. Here, we investigated the distribution of genes in the genomes of two other Gramineae, rice and barley, and used a new set of probes to study further the gene distribution of maize. We found that the distribution of genes in these three genomes is basically similar in that all genes, except for ribosomal genes and some storage protein genes, were located in gene spaces that (i) cover GC ranges of 0.8%, 1.0%, and 1.6% and represent 12%, 17%, and 24% of the genomes of barley, maize, and rice, respectively; (ii) are due to a remarkably uniform base composition in the sequences surrounding the genes, which are now known to consist mainly of transposons; (iii) have sizes approximately proportional to genome sizes, suggesting that expans...Continue Reading

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