Inherited Disease Flashcards
Pathological variants of which genes are associated with breast cancer
BRCA1
BRCA2
TP 53 (rare)
All tumour suppressor genes
oncogene
Mutated derivative of proto-oncogene
‘Gain of function mutation’-dominant manner at cell level
A female with a BRCA 1 or BRCA 2 mutation is a higher risk of which cancers?
Breast & Ovarian
Which BRCA mutation gives the highest risk of Breast Cancer for females?
BRCA1
Males with which BRCA mutation are at increased risk of prostate cancer?
BRCA2
BRCA 1 2 mutations are associated with increased risk of which cancers?
Breast, Ovarian, Pancreatic, Prostate
Clinical indication of Breast cancer; you should be referred for further assessment if you have: (6 criteria)
- one close relative who has had breast cancer before the age of 40
- two or more close relatives who have had breast cancer
- close relatives who have had breast cancer and others who have had ovarian cancer
- one close relative who has had breast cancer in both breasts (bilateral breast cancer)
- a male relative who has had breast cancer
- Ashkenazi Jewish ancestry”
Transcription
DNA copied to mRNA by RNA polymerase
Translation
process in which ribosomes in the cytoplasm or ER synthesize proteins
Codon
triplet nucleotides, 64 of these encode 20 amino acids (3 exceptions)
Polymorphism
Change in triplet code results in same amino acid production
UAU to UAC = Tyr
(conservative)
Mutation
Change in triplet code results in different amino acid production
UAU to UAG = STOP
(truncating)
UAU to UUC = Phe
(non-conservative substitution)
Expressivity
Degree to which a phenotype is expressed in individuals with the same geneotype
MEN2
Autosomal dominant Medullary Thyroid carcinoma Phaeochromocytoma RET gene mutation MEN2A represents 90%
MEN2
Autosomal dominant
MEN2 mutation
example of mutation in oncogene (gain of function)
Medullary Thyroid carcinoma, Phaeochromocytoma (benign)
Familial cancers involving tumour suppressor genes
Retinoblastoma- RB1
Li-Fraumeni syndrome (brain tumours, sarcomas, leukemia)-TP53
Familial adenomatous polyposis-APC
Breast and/or ovarian cancer-BRCA1/2
Colon Cancer Mutator pathway
Lynch Syndrome- MSH2, MLH1
<100 adenomas
High colorectal cancer risk
High endometrial cancer risk