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Proceedings Paper

Maximum-likelihood estimation of restriction-fragment mobilities from 1-D electrophoretic agarose gels
Author(s): Heather A. Drury; David G. Politte; John M. Ollinger; Philip Green; Lewis J. Thomas Jr.
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Paper Abstract

We have developed a technique for finding maximum-likelihood estimates of DNA restriction- fragment mobilities from images of fluorescently stained electrophoretic gels. Gel images are acquired directly using a CCD camera. The likelihood model incorporates the Poisson nature of the photon counts and models the fluorescence intensity as the superposition of Gaussian functions (corresponding to the fragment bands) of varying magnitude and width. An expectation-maximization algorithm is used to find maximum-likelihood estimates of the number of fragments, fragment mobilities, widths of the bands, background contributions, and DNA concentration. This approach has several advantages. Closely spaced and overlapping fragments are accurately resolved into their components. No a priori knowledge of the number or positions of fragments is required. Fragment lengths estimated by the maximum-likelihood method from experimental data were compared to the known lengths of fragments generated from three different restriction digests of bacteriophage (lambda) DNA. Preliminary results using the maximum-likelihood method indicate residual sizing errors on the order of 1%.

Paper Details

Date Published: 26 June 1992
PDF: 12 pages
Proc. SPIE 1660, Biomedical Image Processing and Three-Dimensional Microscopy, (26 June 1992); doi: 10.1117/12.59585
Show Author Affiliations
Heather A. Drury, Washington Univ. (United States)
David G. Politte, Washington Univ. (United States)
John M. Ollinger, Washington Univ. (United States)
Philip Green, Washington Univ. (United States)
Lewis J. Thomas Jr., Washington Univ. (United States)

Published in SPIE Proceedings Vol. 1660:
Biomedical Image Processing and Three-Dimensional Microscopy
Raj S. Acharya; Carol J. Cogswell; Dmitry B. Goldgof, Editor(s)

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