Diagnostic DNA hybridization relies on probes composed of single copy (sc) genomic sequences. Sc sequences in probe design ensure high specificity and avoid cross-hybridization to other regions of the genome, which could lead to ambiguous results that are difficult to interpret. We examine how the distribution and composition of repetitive sequences in the genome affects sc probe performance. A...

BACKGROUND Our previously developed assay for detection of the factor V Leiden mutation (G1691A) based on a nucleic acid photo-cross-linking technology used two allele-specific capture probes and six fluorescein-modified signal-generating reporter probes. We wished to improve the sensitivity and performance of the method. METHODS We developed new reporter probes with approximately 10-fold mor...

roots of helianthemum species were collected from various rangeland sites in fars, and other provinces in iran. the partial small subunits of ribosomal dna genes were amplified with the genomic dna extracted from their roots by nested polymerase chain reaction (pcr) using the universal fungal primer pair its1/its4 and specific primer pair ftc/rtc, which was designed based on internal transcribe...

The human T cell receptor gamma locus has been extensively characterized (for review, see ref. 1). The locus which covers 160 kb of genomic DNA is located at 7pl4-15 (2-4). It comprises 2 constant genes, 5 joining segments and 14 variable genes all of which have been sequenced (1). The variable gene TCRGV9 belongs to the V7II subgroup and is the single member of that subgroup. We have defined t...

We have mapped the multiple (15-25) genes coding for the hormonally regulated major urinary proteins (MUPs) of the mouse by using a cloned cDNA probe. By Southern blot analysis of DNA from Chinese hamster-mouse somatic cell hybrids, all of the MUP genes were found to be on chromosome 4. Different inbred mouse strains showed DNA polymorphism in their MUP Southern hybridization pattern. Analysis ...

Metaphase I (MI) pairing of wheat homologous chromosomes is usually reduced in hybrids between cultivars relative to the parental inbred lines. Previous work suggested that this phenomenon is caused by polymorphism in nucleotide sequences (nonstructural chromosome variation) among wheat cultivars. The present work investigated the distribution of this variation along three selected chromosome a...

Fluorescence in situ hybridization (FISH) probe for the identification of the Philadelphia (Ph) translocation [t(9;22) (q34;qll)l in chronic myelogenous leukemia cells was developed by inter-Alu-polymerase chain reaction of DNA from an interspecific somatic cell hybrid containing approximately 5 Mb of human DNA covering the ABL gene region on human chromosome 9q34. This probe was large nough...

SOURCE/DESCRIPTION: Probe LDR152-a 1.68 Kb single copy Hind III fragment isolated from a chromosome 19 bivariate flow sorted enriched Charon 21A library and subcloned into SP64. CHROMOSOMAL LOCALISATION: 1 9cent-1 9q 1 • 3 by somatic cell hybrid and linkage data. POLYMORPHISMS: Recognises two, two allele polymorphisms when U3ed to probe human genomic DNA digested with P3t I and Msp I.

Human genomic samples are complex and are considered difficult to assay directly without denaturation or PCR amplification. We report the use of a base-specific heteropolymeric triplex, formed by native duplex genomic target and an oligonucleotide third strand probe, to assay for low copy pathogen genomes present in a sample also containing human genomic duplex DNA, or to assay human genomic du...

We have previously shown that arsenic-containing Chinese herbal formula, Qing-Huang powder capsule (containing tetraarsenic tetrasulfide, As(4)S(4)), is effective in the treatment of myelodysplastic syndrome (MDS); yet the underlined mechanisms remain unclear. In this study, using standard cytogenetic analysis (G-banded) and global DNA methylation method (ChIP-on-chip assays), we aimed to deter...