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Introduction to Nuclear Reprogramming

Introduction to Nuclear Reprogramming

Nuclear reprogramming is the process of switching gene expression of one cell type to that of another cell type, usually from a differentiated cell state to an undifferentiated cell state. Differentiation occurs during processes such as development and morphogenesis, tissue regeneration, and malignancy. Cells can also be artificially induced to reprogram their gene expression by techniques such as nuclear transfer, induced pluripotency, and cell fusion. Such techniques have many applications in...

Methods of Nuclear Reprogramming

Methods of Nuclear Reprogramming

Nuclear reprogramming is a process of transforming one cell type into an unrelated cell type by epigenetic changes that alter the cell’s original gene expression pattern. Such epigenetic changes force cells to express a different set of genes, which play a significant role in inducing transformation into other cell types. Nuclear reprogramming offers applications in reproductive cloning for livestock propagation and regenerative medicine — developing patient-specific cells for injury repair.

Replication in Eukaryotes

Replication in Eukaryotes

In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...

Replication in Eukaryotes

Replication in Eukaryotes

Telomeres and Telomerase

Telomeres and Telomerase

In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded DNA.

Telomeres and Telomerase

Telomeres and Telomerase

In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded DNA.

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Utilizing Murine Inducible Telomerase Alleles in the Studies of Tissue Degeneration/Regeneration and Cancer

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Published on: April 13, 2015

Telomere rejuvenation during nuclear reprogramming.

Rosa M Marión¹, Maria A Blasco

¹Spanish National Cancer Centre, Madrid, Spain.

Current Opinion in Genetics & Development

|February 24, 2010

Summary

Nuclear reprogramming fully rejuvenates telomeres, restoring chromosomal stability. This epigenetic reversal is crucial for the quality of induced pluripotent stem (iPS) cells and somatic cell nuclear transfer (SCNT) products.

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Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence

Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence

Published on: May 22, 2013

Area of Science:

Cell biology
Epigenetics
Stem cell research

Background:

Cellular reprogramming restores pluripotency using methods like somatic cell nuclear transfer (SCNT) and induced pluripotent stem (iPS) cell generation.
Telomeres are critical for maintaining chromosomal stability during cell division.

Purpose of the Study:

To investigate whether nuclear reprogramming fully rejuvenates telomeres.
To understand the role of telomere structure and epigenetic control in reprogramming.

Main Methods:

Somatic cell nuclear transfer (SCNT)
Induced pluripotent stem (iPS) cell generation through transcription factor overexpression
Analysis of telomere length and structure
Epigenetic analysis of telomeric chromatin

Main Results:

Nuclear reprogramming effectively rejuvenates telomeres.
Telomere chromatin structure is dynamic and epigenetically regulated.
Reprogramming reverses epigenetic modifications controlling telomere structure.

Conclusions:

Telomere rejuvenation is a key feature of successful nuclear reprogramming.
Epigenetic mechanisms play a vital role in controlling telomere dynamics during reprogramming.
These findings enhance the understanding of cellular reprogramming quality and epigenetic memory.