Atomic force microscope analysis of chromatin volumes in human sperm with head-shape abnormalities

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Abstract

We used the atomic force microscope to perform volume measurements on individual human sperm nuclei under ambient conditions. Data obtained for normal sperm and for sperm from seven of the nine classes of head-shape abnormality revealed that the nuclear volumes were essentially identical for sperm in each headshape class, even though the projected areas and shapes of the nuclei have were shown to vary widely. These results indicate that the abnormal sperm head morphologies found at a rate of 25-40% in fertile males are not caused by factors that affect the volume of sperm chromatin, such as the DNA content of the sperm nucleus, differences in chromatin organization, or the extent of DNA compaction.

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Lee IV, J. D., Allen, M. J., & Balhorn, R. (1997). Atomic force microscope analysis of chromatin volumes in human sperm with head-shape abnormalities. Biology of Reproduction, 56(1), 42–49. https://doi.org/10.1095/biolreprod56.1.42

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