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Inheritance of Chromatin Structures03:17

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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...
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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
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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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Related Experiment Video

Updated: Sep 11, 2025

Stable Isotope In-Vivo Labeling for Mass-Spectrometry Identification of Paternal Metabolites Transferred from Sperm to Oocyte During Fertilization
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Stable Isotope In-Vivo Labeling for Mass-Spectrometry Identification of Paternal Metabolites Transferred from Sperm to Oocyte During Fertilization

Published on: June 17, 2025

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Sperm histone mediated epigenetic inheritance†.

Bhupender Singh1,2, Rajeev Singh3, Madan M Chaturvedi1,4

  • 1Department of Zoology, University of Delhi, Delhi, India.

Biology of Reproduction
|August 14, 2025
PubMed
Summary
This summary is machine-generated.

Sperm retain some histones, crucial for embryonic development via paternal epigenetic inheritance. Understanding histone retention mechanisms and their modifications is key to unlocking reproductive insights.

Keywords:
Sperm retained histonesepigenetic inheritancehistone post-translational modifications and histone variantsprotaminesspermiogenesis

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Area of Science:

  • Reproductive Biology
  • Epigenetics
  • Sperm Biology

Background:

  • Spermatogenesis involves replacing most histones with protamines for sperm chromatin compaction.
  • A small percentage of histones (1-15%) are retained in mammalian sperm.
  • Retained sperm histones, with their post-translational modifications (PTMs), are implicated in regulating embryonic development and paternal epigenetic inheritance.

Purpose of the Study:

  • To review potential mechanisms of histone retention in sperm.
  • To explore the differential localization of retained histones within chromatin domains.
  • To discuss the role of histone PTMs and protamines in histone-mediated epigenetic inheritance.

Main Methods:

  • This review synthesizes existing literature on sperm histone retention and epigenetic inheritance.
  • Mechanisms of histone-to-protamine transition are examined.
  • The interplay between histone PTMs, DNA methylation, and non-coding RNA is discussed.

Main Results:

  • Retained sperm histones are found at CpG sites of developmental genes and gene deserts, exhibiting varied PTMs.
  • The precise mechanisms for histone retention, specific localization, and crosstalk with other epigenetic factors remain largely unknown.
  • Histone PTMs and protamine modifications are critical for histone-mediated epigenetic inheritance.

Conclusions:

  • Retained sperm histones and their PTMs play a significant role in paternal epigenetic inheritance and early embryonic development.
  • Further research is needed to elucidate the exact mechanisms governing histone retention and their interactions with the epigenome.
  • Understanding these processes is vital for reproductive biology and developmental science.