Cell Biochemistry and Biophysics

, Volume 45, Issue 1, pp 59–70 | Cite as

Single-step multicolor fluorescence In situ hybridization using semiconductor quantum dot-DNA conjugates

  • Laurent A. BentolilaEmail author
  • Shimon Weiss
Original Article


We report a rapid method for the direct multicolor imaging of multiple subnuclear genetic sequences using novel quantum dot-based fluorescence in situ hybridization (FISH) probes (QD-FISH). Short DNA oligonucleotides were attached on QDs and used in a single hybridization/detection step of target sites in situ. QD-FISH probes penetrate both intact interphase nuclei and metaphase chromosomes and showed good targeting of dense chromatin domains with minimal steric hindrances. We further demonstrated that QD’s broad absorption spectra allowed different colored probes specific for distinct subnuclear genetic sequences to be simultaneously excited with a single excition wavelength and imaged free of chromatic aberrations in a single exposure. Thus, these results demonstrate that QD-FISH probes are very effective in multicolor FISH applications. This work also documents new possibilities of using QD-FISH probes detection down to the single molecule level.

Index Entries

Quantum dots FISH DNA heterochromatin centromere fluorescnece imaging microscopy hybridization biomaterial nanotechnology 


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Copyright information

© Humana Press Inc. 2006

Authors and Affiliations

  1. 1.Department of Chemistry and BiochemistryUniversity of California at Los AngelesLos Angeles
  2. 2.California NanoSystems InstituteUniversity of California at Los AngelesLos Angeles
  3. 3.Department of Physiology, David Geffen School of MedicineUniversity of California at Los AngelesLos Angeles

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