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Down Syndrome - Trisomy 21

Introduction

Trisomy 21 - Down Syndrome

Trisomy 18, Edward Syndrome

Trisomy 13, Patau Syndrome

Neural Tube and Ventral Wall Defects

William's Syndrome

Turner's Syndrome

Cri Du Chat Syndrome

Trisomy 21 (Down Syndrome) is a genetic disorder that occurs when an extra copy of the chromosome is present in the 21st chromosomal pairing.

This is the most common form of genetic disorders in humans.  Some statistics claim that as many as 1 in 700 embryos are Trisomy 21.  The risk of carrying a Trisomy 21 child increases with age (after 35, the risk increases dramatically).  See the article on Genetic Testing Options in Pregnancy for details of screening programs and genetic diagnostic techniques available.     

Mental retardation is an inevitable result of this extra chromosome. Down Syndrome also carries with it major risk of heart defects as well as gastrointestinal problems associated with intestine or esophagus blockages.

The vast majority of Down Syndrome people require intensive care for the duration of their lives, although many are able to become semi self-sufficient during adulthood.

The following sites can be useful for people seeking further information or support for Down Syndrome:

http://www.downs-syndrome.org.uk

http://www.nas.com/downsyn

http://www.ndss.org

http://www.nads.org

http://www.ds-health.com

http://www.down-syndrome.net

http://www.downsnet.org

http://www.downsyndrome.com

http://www.healthboards.com/down-syndrome

Introduction

Trisomy 21 - Down Syndrome

Trisomy 18, Edward Syndrome

Trisomy 13, Patau Syndrome

Neural Tube and Ventral Wall Defects

William's Syndrome

Turner's Syndrome

Cri Du Chat Syndrome

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