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Genomic Imprinting and Inheritance

Genomic 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...

Epigenetic Regulation

Epigenetic Regulation

Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.

Epigenetic Regulation

Epigenetic 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...

Heterochromatin

Heterochromatin

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.
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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 DNA...

Euchromatin

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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.
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Related Experiment Video

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Immunostaining for DNA Modifications: Computational Analysis of Confocal Images

Immunostaining for DNA Modifications: Computational Analysis of Confocal Images

Published on: September 7, 2017

Conserved features of imprinted differentially methylated domains.

Ariane Paoloni-Giacobino¹, Leonardo D'Aiuto, M Cecilia Cirio

¹Department of Molecular Genetics and Biochemistry University of Pittsburgh, 200 Lothrop Street, Pittsburgh, PA 15261, USA.

|June 5, 2007

Summary

Genomic imprinting relies on differentially methylated domains (DMDs) in mammals. Conserved structural features of tandem repeats within DMDs, not their sequences, maintain this crucial epigenetic imprinting signal.

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Area of Science:

Epigenetics
Genomics
Mammalian Evolution

Background:

Genomic imprinting is an epigenetic phenomenon in mammals, regulating parental allele-specific gene expression.
Differentially methylated domains (DMDs) are key genomic sites for maintaining imprints established during gametogenesis.
Previous work identified CpG-rich tandem repeats in mouse DMDs crucial for differential methylation maintenance.

Purpose of the Study:

To investigate the conserved features of DMD tandem repeats across mammalian species.
To determine if DNA sequence or structure is the primary determinant of the imprinting signal.
To identify conserved structural characteristics within DMD tandem repeats.

Main Methods:

Comparative sequence analysis of DMD tandem repeats from three mouse genes (Snurf/Snrpn, Kcnq1, Igf2r) across mammalian species.
Analysis of repeat unit organization, size stability, CpG content, and predicted secondary structures.

Main Results:

DMD tandem repeat regions showed remarkable size stability during mammalian evolution despite repeat unit variation.
All analyzed DMD repeats exhibited high CpG content and ordered CpG dinucleotide arrangements.
Predicted secondary structures of these DMD tandem repeats were similar across species.

Conclusions:

The conserved imprinting signal within DMDs is likely a structural feature of the tandem repeats, rather than specific DNA sequences.
This structural feature is maintained across mammalian evolution, underscoring its functional importance in genomic imprinting.
Repeat-related DNA structure plays a critical role in the epigenetic imprinting mechanism.