Measurement of mammalian sperm deoxyribonucleic acid by flow cytometry. Problems and approachesMA Van Dilla, BL Gledhill, S Lake, PN Dean, JW Gray, V Kachel, B Barlogie and W Gohde
Measurement of mammalian sperm deoxyribonucleic acid content is of importance in several areas of biomedical research. When measured in flow systems with orthogonal axes of illumination, flow and detection, an unexpected, distorted distribution consisting of a narrow peak with a lateral extension to the right is observed. Several lines of evidence lead to the conclusion that this effect is an optical-geometric artifact attributable to the flat shape and high index of refraction of mammalian sperm heads. This artifact disappears when an epiillumination flow system is used in which the optic axes for illumination and detection and the flow axis are all coincident. Other approaches also eliminate the artifact. The resulting coefficients of variation observed after acriflavine-Feulgen staining are 4-5%, short of the goal of 1.5% required to distinguish between human sperm bearing X and Y chromosomes and to develop a mutagen test system using mice.
Volume 25,
Issue 7,
pp. 763-773,
07/01/1977
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U.B. Hacker-Klom, W. Gohde, E. Nieschlag, and H.M. Behre DNA flow cytometry of human semen Hum. Reprod., October 1, 1999; 14(10): 2506 - 2512. [Abstract] [Full Text] [PDF] |
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D Pinkel, B. Gledhill, S Lake, D Stephenson, and M. Van Dilla Sex preselection in mammals? Separation of sperm bearing Y and "O" chromosomes in the vole Microtus oregoni Science, November 26, 1982; 218(4575): 904 - 906. [Abstract] [PDF] |
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P. Horan and L. Wheeless Jr Quantitative single cell analysis and sorting Science, October 14, 1977; 198(4313): 149 - 157. [PDF] |
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