Nucleic Acids Research, 2003, Vol. 31, No. 7 1869-1876
© 2003 Oxford University Press
A non-redundant microarray of genes for two related bacteria
Sidney Kimmel Cancer Center, 10835 Altman Row, San Diego, CA 92121, USA and 1 Celera/Applied Biosystems, 45 West Gude Drive, Rockville, MD 20850, USA
The authors wish it to be known that, in their opinion, the first two authors should be regarded as joint First Authors
A microarray with sequences from the annotated open reading frames (ORFs) in Salmonella enterica subspecies 1, serovar Typhimurium was supplemented with annotated chromosomal ORFs from serovar Typhi that are divergent from Typhimurium (>10% DNA sequence divergence). This non- redundant array was used to (i) measure changes in gene copy number in DNA from actively growing versus stationary Typhi and (ii) to reveal the transcriptional response of Typhi to peroxide, a stress similar to that experienced when they are phagocytosed by macrophages. In S.enterica subspecies 1, pairs of genomes differ in the presence or absence of
10% of their genes. An array twice the size of that needed to cover all ORFs for one genome could carry close homologs of all the ORFs for 10 genomes. Non-redundant DNA arrays could be constructed for any group of closely related organisms that differ by the presence and absence of a few genes.
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