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Measurement of mammalian sperm deoxyribonucleic acid by flow cytometry. Problems and approaches

MA 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
Copyright © 1977 by The Histochemical Society


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