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7 Aug 2018

explain why the repeat expansion associated with Freidrich's ataxia causes a loss of the fratazin protein. Indicate a possible DNA-based therapy and why this would alleviate the expansion effect?

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Tod Thiel
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7 Aug 2018

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Related questions

1. An occurrence of a gene made larger by trinucleotide repeats is:

Allelic expansion

Nucleotide expansion

Translocation mutation

Transformation

2. a chemical that can damage and/or change DNA is called a/an:

Allele

Endonuclease

Vector

Mutagen

3. An occurrence when a section of a chromosome relocates itself to an entirely different (non-homologous) chromosome is called a/an:

Inversion mutation

Translocation mutation

Transformation mutation

Duplication mutation

4. The tandem repeat in the sequence GGGAAGGGAAGGGAAGGGAAGGGAAG is:

GGA

GGGAA

GGAAG

GGAAGGG

A disease characterized by abnormally shaped hemoglobin is called:

Cystic Fibrosis

Sickle Cell Anemia

Marfan Syndrome

Leukemia

5. A point mutation that causes a substitution of a stop codon with an amino acid and leads to the formation of a longer protein is a:

Nonsense mutation

Missense mutation

Sense mutation

Frameshift mutation

6. Addition or deletion of nucleotides in a DNA sequence is known as a:

Nonsense mutation

Missense mutation

Sense mutation

Frameshift mutation

7. The least severe type of chromosomal mutation is:

Point

Frameshift

Inversion

Translocation

8. Chemicals inserting themselves into DNA can cause a:

Missense mutation

Nonsense mutation

Sense mutation

Frameshift mutation

9. A genetic condition caused by allelic expansion is:

Familial hypercholesterolemia

Fragile X syndrome

Alkaptonuria

Galactosemia

10. Which of the following is most likely the original DNA strand if the mutated DNA strand is ATAGUUGATGUA ?

ATAGAAGATGAA

ATAGCCGATGCA

ATAGGGGATGGA

ATAGTTGATGTA

11. An unbalanced chromosomal mutation would include a/an:

duplication (insertion)

inversion

translocation

denaturation

12. Many translocation mutations are found to be involved with:

cancers

sickle cell anemia

Huntington disease

cystic fibrosis

13. A common repeat throughout the human genome that is approximately 300 bases in length is called a/an:

EcoRI repeat

Hind repeat

Exo repeat

Alu repeat

14. A balanced chromosomal mutation includes:

imprintation

denaturation

inversion

deletion

You are studying a disease, which based on clinicalcharacteristics, may be a "trinucleotide repeat" disease. Aco-worker has identified a gene that may cause this condition.

1. Is it possible, based on only the DNA sequence of thecandidate gene, to determine if the gene might cause thedisease?

2. What causes the alternation in DNA sequence which isresponsible for trinucleotide repeat diseases?

1. A patient with Li-Fraumeni syndrome has a tumor with a mutation on only one allele of p53. Explain why this is not an example of loss of heterozygosity.

2. A tumor virus produces a protein which inhibits p53. Is this viral protein an oncogene or a tumor suppressor? Why?

3. Why might a tumor with mutations in p53 be resistant to radiation therapy?

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