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Bitter end: PTC Sensitivity
By Anna-Maria Vassilevska
and Alexandra Draganova
11/7
Who this condition affects?
• 30 % of the world population cannot taste PTC
• Varies around the world
• 42 % of the indigenous people Australia and
New Guinea cannot taste PTC
• Only 2% of Americans cannot taste it
• No specific age group
Causes
• Genetically inherited
• 1 gene’s responsible for the tasting- TAS2R
• 3 amino acids that differ in tasters and nontasters
• The form of the gene is slightly altered
• Since we have two copies of each gene we may
find something really bitter, slightly bitter or not
bitter at all.
• PTC blindness is a recessive trait
Structure of tongue
•Tongue
•Taste Buds
•Gustatory Cells

•Nerves
•Bitter Taste
Receptors
Symptoms and effects
• Not being able to taste bitter things
• Poisons are usually bitter →when being bitter
taste blind you wouldn’t recognize the bitter
taste of the poison
Tests
• An ornithologist can find out whether your child
has this condition or not and to what extent.
• DNA test of cheek cells
Recommendations
• Be careful with what food you have in the
refrigerator and teach your child to always look
at the expiration date of products.
• The diet of the child must be controlled since it
may not eat the right amount or type of food
• You can expect that your child could get
poisoned without realizing it because it would
not sense the bitter taste of the poison
Discussion questions
• Can we define bitter taste blindness as an
disorder even though it can not lead to any
serious conditions?
• If you were a parent and you knew that there is a
chance for your child to have bitter taste
blindness, would you worry?
Sources
• "Bitter Taste Gene." Neuroscience for Kids. N.p., n.d. Web. 09
Nov. 2013.
• "Phenylthiocarbamide." Wikipedia. Wikimedia Foundation,
11 Feb. 2013. Web. 09 Nov. 2013.
• "Global Variation in Sensitivity to Bitter-Tasting Substances
(PTC or PROP)." [NIDCD Health Information]. N.p., n.d.
Web. 09 Nov. 2013.
• "Taste Disorders." NIDCD. N.p., n.d. Web. 09 Nov. 2013.
• Taste. Digital image. Learn Genetics. N.p., n.d. Web. 11 Nov.
2013.
• Poison 2. Digital image. Meaning of Dreams. N.p., n.d. Web.
11 Nov. 2013.
• Mouth Swab. Digital photo. Zip Trails. N.p., n.d. Web. 11 Nov.
2013.

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Ptc sensitivity version 2

  • 1. Bitter end: PTC Sensitivity By Anna-Maria Vassilevska and Alexandra Draganova 11/7
  • 2. Who this condition affects? • 30 % of the world population cannot taste PTC • Varies around the world • 42 % of the indigenous people Australia and New Guinea cannot taste PTC • Only 2% of Americans cannot taste it • No specific age group
  • 3.
  • 4. Causes • Genetically inherited • 1 gene’s responsible for the tasting- TAS2R • 3 amino acids that differ in tasters and nontasters • The form of the gene is slightly altered • Since we have two copies of each gene we may find something really bitter, slightly bitter or not bitter at all. • PTC blindness is a recessive trait
  • 5. Structure of tongue •Tongue •Taste Buds •Gustatory Cells •Nerves •Bitter Taste Receptors
  • 6. Symptoms and effects • Not being able to taste bitter things • Poisons are usually bitter →when being bitter taste blind you wouldn’t recognize the bitter taste of the poison
  • 7. Tests • An ornithologist can find out whether your child has this condition or not and to what extent. • DNA test of cheek cells
  • 8. Recommendations • Be careful with what food you have in the refrigerator and teach your child to always look at the expiration date of products. • The diet of the child must be controlled since it may not eat the right amount or type of food • You can expect that your child could get poisoned without realizing it because it would not sense the bitter taste of the poison
  • 9. Discussion questions • Can we define bitter taste blindness as an disorder even though it can not lead to any serious conditions? • If you were a parent and you knew that there is a chance for your child to have bitter taste blindness, would you worry?
  • 10. Sources • "Bitter Taste Gene." Neuroscience for Kids. N.p., n.d. Web. 09 Nov. 2013. • "Phenylthiocarbamide." Wikipedia. Wikimedia Foundation, 11 Feb. 2013. Web. 09 Nov. 2013. • "Global Variation in Sensitivity to Bitter-Tasting Substances (PTC or PROP)." [NIDCD Health Information]. N.p., n.d. Web. 09 Nov. 2013. • "Taste Disorders." NIDCD. N.p., n.d. Web. 09 Nov. 2013. • Taste. Digital image. Learn Genetics. N.p., n.d. Web. 11 Nov. 2013. • Poison 2. Digital image. Meaning of Dreams. N.p., n.d. Web. 11 Nov. 2013. • Mouth Swab. Digital photo. Zip Trails. N.p., n.d. Web. 11 Nov. 2013.