Determining orientation and direction of DNA sequences

Details Determining orientation and direction of DNA sequences Determining orientation and direction of DNA sequences

1997-01-29

2000-08-22

Ketter, James

Chemistry: molecular biology and microbiology

Measuring or testing process involving enzymes or...

Involving nucleic acid

C12Q 168

Patent

active

061070300

ABSTRACT:
Determining orientation and direction of DNA sequences. A method by which fluorescence in situ hybridization can be made strand specific is described. Cell cultures are grown in a medium containing a halogenated nucleotide. The analog is partially incorporated in one DNA strand of each chromatid. This substitution takes place in opposite strands of the two sister chromatids. After staining with the fluorescent DNA-binding dye Hoechst 33258, cells are exposed to long-wavelength ultraviolet light which results in numerous strand nicks. These nicks enable the substituted strand to be denatured and solubilized by heat, treatment with high or low pH aqueous solutions, or by immersing the strands in 2.times.SSC (0.3M NaCl+0.03M sodium citrate), to name three procedures. It is unnecessary to enzymatically digest the strands using Exo III or another exonuclease in order to excise and solubilize nucleotides starting at the sites of the nicks. The denaturing/solubilizing process removes most of the substituted strand while leaving the prereplication strand largely intact. Hybridization of a single-stranded probe of a tandem repeat arranged in a head-to-tail orientation will result in hybridization only to the chromatid with the complementary strand present.

REFERENCES:
E.H. Goodwin and J. Meyne, "Strand-Specific FISH Reveals Orientation Of Chromosome 18 Alphoid DNA," Cytogenet. Cell Genet. 63, 126 (1993).
E.H. Goodwin, J. Meyne, S.M. Bailey, D. Quigley, "On the Origin of Lateral Asymmetry," Chromosoma 104, 345 (1996).
Epstein, L. et al., 1995, Cytometry, vol. 21, pp. 378-381.
Lehninger, A., 1975, Biochemistry, Second Ed., Worth Publishers, Inc., especially p. 873.

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