Allelic differences
due to single SNPs
ASOs used as
SNP-specific probes
"Southern Blot" without
electrophoresis, probe "sticks"
to only one allele:
Genetic screen
"positive / negative"
result
Ex.: 508-ASO Test for Cystic Fibrosis probes deletion mutation (OMIM219700)
Pre-Natal Screening:
the GATACCA
model
Ex.: Mr
& Ms Mus seek genetic counseling ....
Species-Specific Oligonucleotides (SSOs)
DNA Fingerprinting
Determination of an individual-specific
genetic patterns
Variable Number of Tandem
Repeat (VNTR) loci
Microsatellites
- di-, tri-, tetra-nucleotide motifs repeated 101s ~ 106s of times
(CACACACACACA
versus CACACACA)
Origin by slipped-mismatch
replication
Copy number
mutates rapidly, even between parents & children
VNTR loci are highly polymorphic
[HOMEWORK]
good marker for within-population
studies
[Animation of DNA
Fingerprinting for forensics
]
Forensics - use of DNA
data as legal evidence
Positive identification of
individuals [HOMEWORK] with
high probability
CODIS
Multiplex
Fingerprinting
"Variant Detector Arrays (VDAs)" detect specific SNP alleles in genome
"GeneChips" perform automated "Northern"
analysis:
specific
mRNAs / cDNAs detected in proteome
"Heat Map" indicate levels of
gene expression by cool &
hot colors
DNA "re-sequencing
(iterative) array" sequences ~500 Kbp in one experiment
All text material ©2025 by Steven M. Carr