Related Experiment Video
Updated: Jun 17, 2026
07:34
Slide Preparation Method to Preserve Three-dimensional Chromatin Architecture of Testicular Germ Cells
Published on: January 10, 2014
Acrylamide disturbs genomic imprinting during spermatogenesis
Zhuoqun Wang1, Shuang Lu, Chunmei Liu
1Graduate School, Peking Union Medical College, Beijing 100005, China.
Frontiers in Bioscience (Elite Edition)
|December 29, 2009
Summary
Acrylamide (ACR) exposure in rats disrupts genomic imprinting in sperm genes, specifically affecting methylation patterns crucial for development. This chemical carcinogen impacts spermatogenesis, highlighting potential reproductive risks.
Area of Science:
- Reproductive toxicology
- Epigenetics
- Environmental health
Background:
- Acrylamide (ACR) is a known carcinogen found in the environment and cooked foods.
- Evidence links ACR to chromosomal damage and mutagenesis.
- The impact of ACR on genomic imprinting during spermatogenesis remains largely unknown.
Purpose of the Study:
- To investigate the effects of ACR exposure on the methylation patterns of rat sperm genes.
- To determine if ACR disrupts genomic imprinting during spermatogenesis.
Main Methods:
- Oral administration of ACR to rats for two weeks.
- Analysis of methylation patterns in specific CpG islands of the insulin-like growth factor II (Igf2) gene in sperm.
- Assessment of methylation changes at different time points (19th and 35th day).
Main Results:
- ACR exposure led to the disappearance of methylation in specific cytosines within the DMR2 of the Igf2 gene by the 35th day.
- Methylation defects induced by ACR varied among individual animals.
- Mitotic spermatogonia and primary spermatocytes were identified as sensitive cell types to ACR-induced imprinting aberration.
Conclusions:
- Acrylamide exposure can cause aberrant genomic imprinting during spermatogenesis in rats.
- ACR predominantly interferes with the epigenetic remodeling process in developing sperm cells.
- Findings suggest potential reproductive health risks associated with environmental ACR exposure.
Related Concept Videos
02:30Genomic Imprinting and Inheritance
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.
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...
01:37Epigenetic Regulation
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.
X-chromosome...
X-chromosome...
01:46Epigenetic Regulation
Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
01:21Nondisjunction
Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers. Nondisjunction is common during anaphase I or anaphase II of meiosis. Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold sister...
03:17Inheritance of Chromatin Structures
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 DNA...
01:32Chromatin Modification in iPS Cells
Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...