Genetics Mnemonics

Genetics Mnemonics

Chromosome 15 diseases Chromosome 15 has its own MAP:
Marfan syndrome
Angelman syndrome
Prader-Willi syndrome

Bartter syndrome: inheritance BARtter syndrome is
autosomal recessive (AR).

DNA probes available for prenatal diagnosis "ABCDEFGH
Probes":
Alpha globin probe: alpha thalassaemia, polycystic kidney
Alpha 1 AT probe: alpha-1 anti-trypsin deficiency
Beta globin probe: beta thalassaemia, sickle cell anaemia
CFTCR probe: cystic fibrosis
Dystrophin probe: Duchenne's modystrophy
Enormous CAG repeat probe: Huntington's disease
Factor VIII probe: haemophilia A
GH probe: growth hormone deficiency
Hemochromatosis probe: hemochromatosis
PAH probe: phenylketonuria

Nucleotides: double vs. triple bonded basepairs "TU
bonds" (two bonds):
T-A and U-A have Two bonds.
G-C therefore has the three bonds.

Codons: nonsense mutation "Stop talking nonsense!":
Nonsense mutation causes premature stop.

DNA: Z vs. B form: which is inactive ZZZZ is sleeping
(inactive).
B form is therefore active DNA.

Nucleotides: purines "AGUA PURa":
Adenine and GUAnine are PURines.
· "Agua pura" is spanish for "pure water".

Hurler's syndrome: symptoms BLUFF:
Blind (corneal opacity)
Little (dwarfish)
Ugly (coarse facial features)
Fool (mental retardation
Failures (failure to thrive and hear failure secondary to coronary artery
disease)

Achrondroplasia dwarfism: inheritance pattern Achondroplasia
Dwarfism is Autosomal Dominant.

Marfan syndrome features MARFAN'S:
Mitral valve prolapse
Aortic Aneurysm
Retinal detachment
Fibrillin
Arachnodactyly
Negative Nitroprusside test (differentiates from homocystinuria)
Subluxated lens

Imprinting diseases: Prader-Willi and Angelman "Pray
to an Angel":
Prader-Willi and Angelman are the 2 classic imprinting diseases.
· Which disease results, depends on whether 15q deletion is maternal or
paternal. Keep them straight by:
Paternal is Prader-Willi.

Down syndrome pathology DOWN:
Decreased alpha-fetoprotein and unconjugated estriol (maternal)
One extra chromosome twenty-one
Women of advanced age
Nondisjunction during maternal meiosis

Hurler syndrome features HURLER'S:
Heptosplenomegaly
Ugly facies
Recessive (AR inheritance)
L-iduronidase deficiency (alpha)
Eyes clouded
Retarded
Short/ Stubby fingers

Tay Sach's features SACHS:
Spot in macula
Ashkenazic Jews
CNS degeneration
Hex A deficiency
Storage disease
· Extra details with TAY:
Testing recommended
Autosomal recessive/ Amaurosis
Young death (<4 yrs)

Down syndrome features: complete "My CHILD HAS PROBLEM!":
Congenital heart disease/ Cataracts
Hypotonia/ Hypothyroidism
Incure 5th finger/ Increased gap between 1st and 2nd toe
Leukemia risk x2/ Lung problem
Duodenal atresia/ Delayed development
Hirshsprung's disease/ Hearing loss
Alzheimer's disease/ Alantoaxial instability
Squint/ Short neck
Protruding tongue/ Palm crease
Round face/ Rolling eye (nystagmus)
Occiput flat/ Oblique eye fissure
Brushfield spot/ Brachycephaly
Low nasal bridge/ Language problem
Epicanthic fold/ Ear folded
Mental retardation/ Myoclonus

APKD: genetics ADult Polycystic Kidney Disease is
Autosomal
Dominant
· Also, "Polycystic kidney" has 16 letters and is due to a defect on
chromosome 16.

DiGeorge/ Velocardiofacial syndrome: features CATCH 22:
Cardiac abnormalities
Abnormal facies
Thymic aplasia
Cleft palate
Hypocalcemia
22q11 deletion

Nucleotides: purines vs. pyrimidines "Guardian Angels
are Pure, with two Wings":
G and A are Purines, with two Rings.

Exon vs. intron function Exons Expressed.
InTrons In Trash.

Nucleotides: class having the single ring · "Pyrimadines are
CUT from purines"
· Pyrimidines are:
Cytosine
Uracil
Thiamine
They are cutfrom purines so the pyrimadines must be smaller (one ring).

Pedigree symbols: gender and affected Gender: The cIRcle
is a gIRl [so boys are squares].
Affected: Black plague was a disease, so black-filled
symbol means an affected/diseased person [so non-filled-in is
unaffected].

Cell cycle stages "Go Sally Go! Make
Children!":
G1 phase (Growth phase 1)
S phase (DNA Synthesis)
G2 phase (Growth phase 2)
M phase (Mitosis)
Cphase (Cytokinesis)

Hardy-Weinberg equilibrium: causes for deviations from it "Maggie
May Does Not Smoke":
Mutations
Migration
Drift
Non-random mating
Selection

Tumor suppressor vs. proto-onogene mutations: recessive vs. dominant
"Recess Suppress":
Tumor suppressor mutations are recessive.
Proto-oncogenes are opposite (dominant).

Blots: function of Southern vs. Northern vs. Western "SN0W
DR0P":
· Match up the 1st word letter with 2nd word letter:
Southern=DNA
Northern=RNA
Western=Protein
· The 0's in snow drop are zeros, since there is no Eastern blot.

Pyrimidines nucleotides "CUT the PY" (cut the
pie):
Cytosine
Uracil
Thiamine
are the PYrimidines

Cri-du-chat syndrome: chromosomal deletion causing it is 5p(-)
What's another name for a cat that's five letters long and starts
with a P? (Answer: pussy).
Why is the cat crying? Missing its P.

Nucleotides: which are purines "Pure Silver":
· Chemical formula of Pure silver is Ag.
Therefore, Purines are Adenine and Guanine.