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Stephanie Belanger January 12, 2009 AP Bio

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Page 1: Stephanie Belanger January 12, 2009 AP Bio. What is Tay-Sachs Disease? An inherited autosomal recessive condition that causes progressive degeneration

Stephanie Belanger

January 12, 2009

AP Bio

Page 2: Stephanie Belanger January 12, 2009 AP Bio. What is Tay-Sachs Disease? An inherited autosomal recessive condition that causes progressive degeneration

What is Tay-Sachs Disease?

• An inherited autosomal recessive condition that causes progressive degeneration of the central nervous system

http://upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Autorecessive.svg/300px-Autorecessive.svg.png

Page 3: Stephanie Belanger January 12, 2009 AP Bio. What is Tay-Sachs Disease? An inherited autosomal recessive condition that causes progressive degeneration

Common Names

• B Variant GM2 Gangliosidosis

• GM2 Gangliosidosis, Type 1

• Hex A Deficiency

• Hexosaminidase A Deficiency

• Sphingolipiosis

• TSD

http://www.msgpp.org/images/Structures/Lmaj005461AAB_hex_view01_light_USF_phobic.png

Page 4: Stephanie Belanger January 12, 2009 AP Bio. What is Tay-Sachs Disease? An inherited autosomal recessive condition that causes progressive degeneration

History

• In 1881, Warren Tay, British ophthalmologist, discovered a cherry red spot on the retina of an infant

• Several years later Bernard Sachs, a New York neurologist, provided the first description of cellular changes in Tay-Sachs disease

http://www.pfofflaserandeye.com/The%20Informed%20Patient/Patient%20Ed%20Common%20Eye%20Disorders/Retina/Retina%20jpgs/crao%20cherry.jpg

Page 5: Stephanie Belanger January 12, 2009 AP Bio. What is Tay-Sachs Disease? An inherited autosomal recessive condition that causes progressive degeneration

Mode of Inheritance

• Autosomal Recessive Gene

• Both parents are carriers, child inherits both recessive genes

• Caused by a mutation of the Hex A gene on chromosome 15

http://www.sfn.org/SiteObjects/published/0000BDF20016F63800FD712C3158BA55/0000BDF2000006250110C68C4585

7663/file/bb_feb2007_large.jpg

Page 6: Stephanie Belanger January 12, 2009 AP Bio. What is Tay-Sachs Disease? An inherited autosomal recessive condition that causes progressive degeneration

Tay-Sachs Description• Deafness

• Decreased Eye Contact

• Blindness

• Decreased Muscle Tone

• Delayed Mental and Social Skills

• Dementia

• Increased Startle Reaction

• Irritability

• Loss of Motor Skills

• Paralysis or loss of motor function

• Seizures

• Slow Growth http://www.curetay-sachs.org/gpx/dakota_260b.jpg

Page 7: Stephanie Belanger January 12, 2009 AP Bio. What is Tay-Sachs Disease? An inherited autosomal recessive condition that causes progressive degeneration

Description Continued• Without the enzyme Hex A, GM2 begins to strangle the nerves in the brain and begins to kill off nerve cells

• Children usually die by age 5, but some live longer

• Most commonly inherited in Ashkenazi Jewish and French Canadian cultures

• 1 in every 250 contract Tay-Sachs disease in the general population

Page 8: Stephanie Belanger January 12, 2009 AP Bio. What is Tay-Sachs Disease? An inherited autosomal recessive condition that causes progressive degeneration

Treatment

• No cure or treatment

• Suggested enzyme replacement therapy

• Substrate reduction drug

• Stem cell transplantation

http://www.usask.ca/alumni/alumnisite/publications/green_white/issues/spring2006/images/stem_cell1.jpg

Page 9: Stephanie Belanger January 12, 2009 AP Bio. What is Tay-Sachs Disease? An inherited autosomal recessive condition that causes progressive degeneration

Detection

• Cannot be detected before symptoms appear

• Disorder tested for once parents notice considerable changes in child’s development and motor skills

• Small percentage detected prenatal, but has been found through chronic villus sampling (CVS)

http://images.main.uab.edu/healthsys/ei_0096.jpg

Page 10: Stephanie Belanger January 12, 2009 AP Bio. What is Tay-Sachs Disease? An inherited autosomal recessive condition that causes progressive degeneration

Ethical Issues

• “What is normal and what is a disability or disorder, and who decides?”

• “Are disabilities diseases? Do they need to be cured or prevented?”

• “Does searching for a cure demean the lives of individuals presently affected by disabilities?”

• “In somatic gene therapy (which is done in the adult cells of persons known to have the disease) more or less ethical then germline gene therapy (which is done in egg and sperm cells and prevents the trait from going on to other generations?”

• “Preliminary attempts at gene therapy are exorbitantly expensive. Who will have access to these therapies? Who will pay for their use?”

Page 11: Stephanie Belanger January 12, 2009 AP Bio. What is Tay-Sachs Disease? An inherited autosomal recessive condition that causes progressive degeneration

Legal Issues

• Human Experimentation

• Standard of Care

• Parental Authority

• Unfairness

• Negligence

http://www.csgv.org/atf/cf/%7B23E96A35-4C75-41EE-BDDD-4BD3A3B59010%7D/GAVEL_COURT.JPG


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