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At least 541 records · Page 30Linked to original sources
PubMed2003

Isolation of high molecular weight DNA from soil for cloning into BAC vectors.

Isolation of high molecular weight DNA fragments from soil, in excess of 1 Mb, and of sufficient quality for cloning into an Escherichia coli-streptomycete artificial chromosome vector is described. The combination of indirect extraction of cells, using a nycodenz extraction technique, followed by lysis of biomass immobilised in agarose plugs, allowed fragments in excess of 1 Mb to be purified.

Bacteria↗
PubMed2003

Chromosomal heteromorphism and an apparent translocation detected using a BAC contig spanning the mating type locus of Phytophthora infestans.

Genetic and physical irregularities associated with the mating type locus of the oomycete, Phytophthora infestans, were revealed by analyzing a contig spanning the locus that was constructed using a bacterial artificial chromosome library. Contigs from both homologs of an A1 strain A/a genotype at mating type locus) had chromosome-specific differences, flanked by regions of similarity. Such heteromorphism was detected within multiple isolates. The mating type locus was narrowed to a 60-70kb interval by genetic mapping of candidate genes, identified using a cDNA library. During these analyses, an unusual isolate of P. infestans was identified in which the mating type determinant had apparently translocated from its location in typical strains. Comparative mapping of the cDNAs between P. infestans and P. parasitica revealed partial synteny between the species however; substantial rearrangements existed and no cDNA was tightly linked to mating type in P. parasitica. These findings add to previous observations of unusual genetic behavior involving mating type in Phytophthora.

Chromosome Mapping↗
PubMed1999

BAC vaccine

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Journal Article↗
PubMed2002

Genome-wide detection of chromosomal imbalances in tumors using BAC microarrays.

Chromosomal imbalances such as deletions and amplifications are common rearrangements in most tumors. Specific rearrangements are consistently associated with specific tumor types or stages, implicating the role of the genes in a region of chromosomal imbalance in tumor initiation and progression. The development of comparative genomic hybridization (CGH) has obviated the need to obtain metaphase spreads from tumors, so that the chromosomal imbalances in many solid tumors may be revealed using an extracted genomic DNA sample. However, the resolution of the cytogenetic method remains and the extreme technical difficulty of CGH has restricted its use. Conceptually, DNA microarray-based CGH is an obvious solution to all of the limitations of conventional CGH. Although arrays have been used for CGH studies, their success has been limited by poor specific signal-to-noise ratios. Here we demonstrate a microarray-based CGH method that allows reliable detection of chromosomal deletions and amplifications with high resolution. Our microarray system is fundamentally different from most current microarray technologies in that activated DNA is printed on natural glass surfaces while other systems almost exclusively focus on activating the surfaces, a strategy that invariably introduces hybridization backgrounds. The concept of using pre-modification may be generally applied for making arrays of other biological materials, as modifying the substrates will be more controllable in solution than on surfaces.

Animals↗