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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 16 — Jun. 1, 2000
  • pp: 2831–2839

Effects of fluorescence excitation geometry on the accuracy of DNA fragment sizing by flow cytometry

James H. Werner, Erica J. Larson, Peter M. Goodwin, W. Patrick Ambrose, and Richard A. Keller  »View Author Affiliations


Applied Optics, Vol. 39, Issue 16, pp. 2831-2839 (2000)
http://dx.doi.org/10.1364/AO.39.002831


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Abstract

We report on various excitation geometries used in ultrasensitive flow cytometry that yield a linear relation between the fluorescence intensity measured from individual stained DNA fragments and the lengths of the fragments (in base pairs). This linearity holds for DNA samples that exhibit a wide range of conformations. The variety of DNA conformations leads to a distribution of dipole moment orientations for the dye molecules intercalated into the DNA. It is consequently important to use an excitation geometry such that all dye molecules are detected with similar efficiency. To estimate the conformation and the extent of elongation of the stained fragments in the flow, fluorescence polarization anisotropy and autocorrelation measurements were performed. Significant extension was observed for DNA fragments under the flow conditions frequently used for DNA fragment sizing. Classical calculations of the fluorescence emission collected over a finite solid angle are in agreement with the experimental measurements and have confirmed the relative insensitivity to DNA conformation of an orthogonal excitation geometry. Furthermore, the calculations suggested a modified excitation geometry that has increased our sizing resolution.

© 2000 Optical Society of America

OCIS Codes
(030.5260) Coherence and statistical optics : Photon counting
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(260.2510) Physical optics : Fluorescence
(260.5430) Physical optics : Polarization
(280.2490) Remote sensing and sensors : Flow diagnostics

History
Original Manuscript: July 30, 1999
Revised Manuscript: February 10, 2000
Published: June 1, 2000

Citation
James H. Werner, Erica J. Larson, Peter M. Goodwin, W. Patrick Ambrose, and Richard A. Keller, "Effects of fluorescence excitation geometry on the accuracy of DNA fragment sizing by flow cytometry," Appl. Opt. 39, 2831-2839 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-16-2831


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References

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