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Related Concept Videos

Reproductive Cloning01:27

Reproductive Cloning

Reproductive cloning is the process of producing a genetically identical copy—a clone—of an entire organism. While clones can be produced by splitting an early embryo—similar to what happens naturally with identical twins—cloning of adult animals is usually done by a process called somatic cell nuclear transfer (SCNT).
Somatic Cell Nuclear Transfer
In SCNT, an egg cell is taken from an animal and its nucleus is removed, creating an enucleated egg. Then a somatic cell—any cell that is not a sex...
Introduction to Nuclear Reprogramming01:14

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...
Cloning of Dolly the Sheep01:08

Cloning of Dolly the Sheep

The first successfully cloned mammal was Dolly, a sheep, born on 5th July 1996 at Roslin Institute, Scotland. The cloned sheep was named after the American singer Dolly Parton. Dolly lived for seven years and died of respiratory complications, which is speculated to be due to the actual age of her DNA. Because the DNA in cloned cells belongs to an older individual,  the cloned individual’s life expectancy may be affected. Indeed, analysis of Dolly’s DNA revealed shorter telomeres than other...
Induced Pluripotent Stem Cells01:06

Induced Pluripotent Stem Cells

Stem cells are undifferentiated cells that divide and produce different cell types. Ordinarily, cells that have differentiated into a specific cell type are terminally differentiated; however, scientists have found a way to reprogram these mature cells so that they dedifferentiate and return to an unspecialized, proliferative state. These cells are pluripotent like embryonic stem cells—able to produce all cell types—and are called induced pluripotent stem cells (iPSCs).
Somatic cells are...
Somatic to iPS Cell Reprogramming01:29

Somatic to iPS Cell Reprogramming

Reprogramming alters the gene expression in somatic cells, transforming them into induced pluripotent stem (iPS) cells over several generations. Scientists can reprogram cells by introducing genes for four transcription factors—Oct4, Sox2, Klf4, and c-Myc (OSKM) by viral or non-viral methods. These factors are also known as Yamanaka factors after Shinya Yamanaka, who first generated iPS cells using mouse skin cells. Yamanaka was awarded the Nobel Prize in Physiology or Medicine in 2012 for this...
Methods of Nuclear Reprogramming01:24

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.

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Related Experiment Video

Updated: Jul 9, 2026

Nuclear Transfer into Mouse Oocytes
14:17

Nuclear Transfer into Mouse Oocytes

Published on: November 30, 2006

Somatic cell nuclear transfer in mammals: progress and applications.

A Colman1

  • 1PPL Therapeutics, Roslin, Edinburgh EH25 9PP, Scotland. acolman@ppl-therapeutics.com

Cloning
|October 13, 2005
PubMed
Summary

Somatic nuclear transfer, successful in mammals using adult cells, confirms nuclear totipotency. This technique has broad applications in aging research, gene targeting, and regenerative medicine.

Area of Science:

  • Developmental Biology
  • Genetics
  • Cell Biology

Background:

  • Somatic nuclear transfer (SNT) has been used in frogs since the 1960s, but generating adult frogs from adult cells remained elusive.
  • Recent advancements have established the successful birth of mammals (sheep, cows, goats, mice) using SNT with fetal or adult cell donors.

Purpose of the Study:

  • To demonstrate the totipotency of nuclei from adult differentiated cells.
  • To explore the research and commercial applications of somatic nuclear transfer.

Main Methods:

  • Somatic nuclear transfer using differentiated fetal or adult cells as nuclear donors.
  • Developmental assessment of reconstructed embryos to term.

Main Results:

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Transnuclear Mice with Pre-defined T Cell Receptor Specificities Against Toxoplasma gondii Obtained Via SCNT
13:36

Transnuclear Mice with Pre-defined T Cell Receptor Specificities Against Toxoplasma gondii Obtained Via SCNT

Published on: September 30, 2010

A Simple Microaspiration Technique for Isolating Somatic Cells from Cryopreserved Equine Semen as Nuclear Donors for Cloning
04:36

A Simple Microaspiration Technique for Isolating Somatic Cells from Cryopreserved Equine Semen as Nuclear Donors for Cloning

Published on: December 19, 2025

Related Experiment Videos

Last Updated: Jul 9, 2026

Nuclear Transfer into Mouse Oocytes
14:17

Nuclear Transfer into Mouse Oocytes

Published on: November 30, 2006

Transnuclear Mice with Pre-defined T Cell Receptor Specificities Against Toxoplasma gondii Obtained Via SCNT
13:36

Transnuclear Mice with Pre-defined T Cell Receptor Specificities Against Toxoplasma gondii Obtained Via SCNT

Published on: September 30, 2010

A Simple Microaspiration Technique for Isolating Somatic Cells from Cryopreserved Equine Semen as Nuclear Donors for Cloning
04:36

A Simple Microaspiration Technique for Isolating Somatic Cells from Cryopreserved Equine Semen as Nuclear Donors for Cloning

Published on: December 19, 2025

  • Successful generation of live-born mammals from adult somatic cell nuclear transfer.
  • Confirmation that nuclei from adult differentiated cells retain totipotency.

    • Conclusions:

    • Somatic nuclear transfer with adult mammalian cells validates nuclear totipotency, extending earlier frog studies.
    • SNT offers significant potential for basic research in aging, cancer, and epigenetics, as well as commercial applications like gene targeting in livestock and therapeutic stem cell generation in humans.