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Changes To Embryonic Stem Cells Caused By Down Syndrome Revealed

Date:
September 8, 2008
Source:
Queen Mary, University of London
Summary:
Scientists investigating the mechanisms of Down syndrome have revealed the earliest developmental changes in embryonic stem cells caused by an extra copy of human chromosome 21 -- the aberrant inheritance of which results in the condition.

Scientists investigating the mechanisms of Down Syndrome (DS) have revealed the earliest developmental changes in embryonic stem cells caused by an extra copy of human chromosome 21 – the aberrant inheritance of which results in the condition.

Lead by Dean Nizetic, Professor of Cellular and Molecular Biology at Barts and The London School of Medicine and Dentistry, the team utilised embryonic stem cells from a previously genetically engineered species of mice carrying a copy of human chromosome 21.

They discovered that extra chromosome 21 - a genetic state known as trisomy 21 - disturbs a key regulating gene called NRSF or REST, which in turn disturbs the cascade of other genes that control normal development at the embryonic stem cell stage. Furthermore, they identified one gene (DYRK1A) on human chromosome 21, whose overdose in trisomy (DS) is responsible for the observed effects.

Down Syndrome belongs to the group of conditions called 'aneuploidies', defined by an abnormal loss or gain of genetic material, i.e. fragments of chromosomes or whole chromosomes. Aneuploidies cause congenital anomalies that are a prime cause of infant death in Europe and the USA, and are currently on the increase with advancing maternal age in European countries. The number of people with DS in Europe exceeds half a million.

The condition is more common than muscular dystrophy and cystic fibrosis, but the development of new therapeutic concepts is hindered by the fact that unlike muscular dystrophy and cystic fibrosis, where a single mutated gene causing the disease is known, the entire human chromosome 21 (containing around 300 genes) still has to be dissected into individual gene-dose contributions to the DS symptoms.

Professor Nizetic, calling for further research into the components of the disturbed cascade he and his team have revealed said; "We hope that further research might lead to clues for the design of new therapeutic approaches tackling developmental delay, mental retardation, ageing and regeneration of brain cells, and Alzheimer's disease. In other words, we hope our work will open new routes to tackle the genetics of these health disorders, approaching them from the "back entrance", as dominant component-symptoms of Down Syndrome."

Professor Nizetic's research was conducted in collaboration with scientists from UCL, NIMR, and the Institute of Cancer Research, and internationally with colleagues from the universities of Geneva, Barcelona, Sydney and San Francisco.


Story Source:

The above story is based on materials provided by Queen Mary, University of London. Note: Materials may be edited for content and length.


Journal Reference:

  1. DYRK1A-Dosage Imbalance Perturbs NRSF/REST Levels, Deregulating Pluripotency and Embryonic Stem Cell Fate in Down Syndrome. American Journal of Human Genetics, 4 September 2008

Cite This Page:

Queen Mary, University of London. "Changes To Embryonic Stem Cells Caused By Down Syndrome Revealed." ScienceDaily. ScienceDaily, 8 September 2008. <www.sciencedaily.com/releases/2008/09/080904145053.htm>.
Queen Mary, University of London. (2008, September 8). Changes To Embryonic Stem Cells Caused By Down Syndrome Revealed. ScienceDaily. Retrieved August 2, 2014 from www.sciencedaily.com/releases/2008/09/080904145053.htm
Queen Mary, University of London. "Changes To Embryonic Stem Cells Caused By Down Syndrome Revealed." ScienceDaily. www.sciencedaily.com/releases/2008/09/080904145053.htm (accessed August 2, 2014).

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