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Three-dimensional Characterization of Interorganelle Contact Sites in Hepatocytes using Serial Section Electron Microscopy

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Three-dimensional reconstruction of rat sperm using volume electron microscopy.

Jiazheng Liu^1,2,3, Limei Lin^2,3, Lina Zhang^2,3

¹School of Future Technology, University of Chinese Academy of Sciences, Beijing 101408, China.

Acta Biochimica Et Biophysica Sinica

|September 7, 2024

Summary

Three-dimensional (3D) reconstruction of rat sperm using automated tape-collecting ultramicrotome scanning electron microscopy (ATUM-SEM) reveals key ultrastructural changes during spermiogenesis. This detailed analysis enhances understanding of male fertility and infertility causes.

Keywords:

ATUM-SEM spermatid spermiogenesis three-dimensional reconstruction

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Area of Science:

Reproductive Biology
Cellular Ultrastructure
Male Fertility Research

Background:

Understanding sperm ultrastructure is crucial for diagnosing male infertility.
Spermiogenesis involves complex morphological transformations vital for sperm function.

Purpose of the Study:

To conduct a comprehensive 3D ultrastructural examination of rat sperm.
To elucidate the morphological changes during spermiogenesis using advanced imaging techniques.

Main Methods:

Utilized automated tape-collecting ultramicrotome scanning electron microscopy (ATUM-SEM) for 3D reconstruction.
Analyzed cellular ultrastructure of rat sperm during development.

Main Results:

Observed significant nuclear volume reduction (to 10%) during spermiogenesis.
Detailed the elongation and attachment of acrosomal vesicles to the nucleus.
Tracked mitochondrial migration to form the energy-providing sheath in the sperm tail.
Reconstructed the chromatoid body, an mRNA-storing structure.

Conclusions:

3D ultrastructural analysis provides unprecedented insight into spermiogenesis.
Findings contribute to a deeper understanding of male fertility and causes of infertility.
This research advances the comprehensive knowledge of sperm 3D ultrastructure.