Related Experiment Video
Updated: Jul 27, 2025
11:04
A Cell Free Assay to Study Chromatin Decondensation at the End of Mitosis
Published on: December 19, 2015
10.4K
THE INTRINSIC MECHANISM OF CHROMATIN DECONDENSATION AND ITS ACTIVATION IN HUMAN SPERMATOZOA
Ulrik Kvist1, Björn A Afzelius2, Lennart Nilsson3
1Department of Physiology I, Karolinska Institute, S-104 01 Stockholm.
Development, Growth & Differentiation
|June 7, 2023
Summary
Human sperm chromatin decondensation relies on an intrinsic mechanism, crucial for in vivo fertilization. Prostatic zinc may protect this ability from oxidative damage, enabling sperm function.
Area of Science:
- Reproductive biology
- Spermatozoa research
- Chromatin structure
Background:
- Human sperm chromatin undergoes decondensation during fertilization.
- The precise in vitro mechanisms and protective factors are not fully understood.
- Oxidative stress can impair sperm function.
Purpose of the Study:
- To investigate the intrinsic mechanism of human sperm chromatin decondensation in vitro.
- To provide morphological evidence for the in vivo relevance of this mechanism.
- To explore the role of prostatic zinc in protecting sperm chromatin.
Main Methods:
- Light microscopy
- Scanning electron microscopy
- Transmission electron microscopy
Main Results:
- Morphological evidence supports an intrinsic mechanism essential for in vivo chromatin decondensation.
- Prostatic zinc is hypothesized to protect sperm's decondensation potential via thiol-group binding.
- Disulphide bonds in eutherian spermatozoa may prevent self-degradation.
Conclusions:
- An intrinsic mechanism drives human sperm chromatin decondensation.
- Prostatic zinc plays a protective role against oxidative damage.
- Structural adaptations in spermatozoa safeguard them during transit.
Related Concept Videos
03:17Inheritance of Chromatin Structures
6.3K
Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
6.3K
02:05Duplication of Chromatin Structure
5.6K
The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
5.6K
02:38Heterochromatin
14.0K
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at...
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at...
14.0K
01:01Euchromatin
7.0K
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
7.0K
01:32Chromatin Packaging
16.8K
Each human somatic cell contains 6 billion base pairs of DNA. Each base pair is 0.34 nm long, meaning each diploid cell contains a staggering 2 meters of DNA. This long DNA strand is packed inside a nucleus measuring only 10-20 microns in diameter with the help of specialized DNA-binding proteins called histones. Together they form a compact DNA-protein complex called chromatin. The chromatin is further compacted into higher-order structures. The highest level of compaction is achieved during...
16.8K
02:15Condensins
3.5K
Condensins are large protein complexes that use ATP to fuel the assembly of chromosomes during mitosis. They transform the tangled, shapeless mass of post-interphase DNA into individualized chromosomes by compacting, organizing, and segregating chromosomal DNA.
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
3.5K