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Related Concept Videos

Centrioles and Centrosomes01:13

Centrioles and Centrosomes

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Most animal cells comprise a pair of centrioles together called a centrosome. The cell duplicates its centrosome and contains two centrosomes side-by-side, which begin to move apart during the prophase. As the centrosomes migrate to two different sides of the cell, microtubules start extending from each centrosome toward the other end. The mitotic spindle is composed of the centrosomes and their emerging microtubules.
Near the end of the prophase, also called late prophase or...
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Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male...
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Histone Variants at the Centromere02:30

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Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3...
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Sperm Structure and Semen Composition01:22

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During ejaculation, males release around 2-5 milliliters of semen, which is a complex mixture of mature sperm and various fluids produced by accessory glands. The mature sperm cells measure approximately 60 micrometers in length and consist of a head, neck, midpiece, and tail. The head is flattened and tapered, measuring about 4 to 5 micrometers in length. It contains a nucleus with condensed chromosomes and an acrosome, a cap-like structure filled with enzymes essential for penetrating the...
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Centrosome Duplication02:25

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The primary microtubule organizing center (MTOC) in animal cells is the centrosome. A centrosome has two cylindrical centrioles at its core. Each centriole consists of nine sets of three microtubules held together by proteins. The centrioles are positioned at right angles to each other and surrounded by a shapeless protein cloud called the pericentriolar matrix, or pericentriolar material (PCM).
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Sperm Transport01:15

Sperm Transport

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The journey of sperm from its origin to the point of ejaculation begins within the seminiferous tubules of the testis. Here, Sertoli cells produce fluid that propels non-motile sperm through a series of conduits, starting with the straight tubules leading to the rete testis. This interconnected network of tubules acts as the initial pathway for sperm, guiding them into the efferent ductules and then into the epididymis for maturation.
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Related Experiment Video

Updated: Aug 7, 2025

Imaging Centrosomes in Fly Testes
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Focus on centrin in normal and altered human spermatozoa.

Elena Moretti1, Daria Noto1, Roberta Corsaro1

  • 1Department Molecular and Developmental Medicine, University of Siena, Siena, Italy.

Systems Biology in Reproductive Medicine
|March 9, 2023
PubMed
Summary

Centrin, a key protein in sperm centrioles, plays a crucial role in male fertility. Altered centrin distribution in sperm may cause infertility, necessitating further research for reproductive health advancements.

Keywords:
Centrinshuman spermatozoasperm connecting piecesperm proximal and distal centrioles

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Area of Science:

  • Reproductive Biology
  • Molecular Biology
  • Cell Biology

Background:

  • Centrin is a calcium-binding phosphoprotein vital for centriole structure and function.
  • In humans, three centrin genes exist, with Centrin 1 being the sole isoform in spermatozoa.
  • Centrin is essential for centrosome dynamics during sperm development and early embryonic cell division.

Approach:

  • This review synthesizes current research on centrin's role in human sperm.
  • It examines centrin's localization and function in normal and defective spermatozoa.
  • The review discusses findings from human and animal model studies.

Key Points:

  • Centrin 1 is localized to the sperm's head-tail junction, appearing as two distinct spots in normal sperm.
  • Abnormal centrin distribution is observed in defective spermatozoa, potentially impacting fertility.
  • Centrin mutations can lead to structural defects in the sperm's connecting piece, causing fertilization or developmental issues.

Conclusions:

  • Centrin's presence and function in the sperm connecting piece are critical for successful reproduction.
  • Further investigation into centrin's role is needed to address idiopathic male infertility.
  • Understanding centrin's abnormalities may offer new therapeutic strategies for male reproductive health.