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DNA
Microarray Analysis
Daniel Kosalla
DNA Microarray
Analysis
 DNA
 Microarray
 Analysis
DNA
Microarraydna
Microarraydna
DNA?
Genes
Gene expression
Microarrays
What are microarrays?
Microarraydna
Microarraydna
Output data?
> exprs(mydata)[1:10,]
Down Syndrome-Astrocyte-1478-1-U133A.CEL
1 142.0
2 9543.8
3 163.0
4 9706.8
5 48.3
6 133.5
7 8966.0
8 129.0
Output data?
> mydata
AffyBatch object
size of arrays=712x712 features (29 kb)
cdf=HG-U133A (22283 affyids)
number of samples=25
number of genes=22283
annotation=hgu133a
notes=
RoadMap
Analysis
Case Study
Down Syndrome
Trisomy
In trisomy 21, the presence of an extra
set of genes leads to overexpression of
the involved genes, leading to increased
production of certain products.
Suspects
 COL6A1ETS2
 Superoxide Dismutase (SOD1)
 CAF1A
 Cystathione Beta Synthase (CBS)
 DYRK
 CRYA1
 GART
 IFNAR
RrrrrRRRrrr
R
How to deal with the
data?
 Import
 Check for abnormalities
 Normalize
 Differential analysis
 Filtering
 Output
Import
DataSet
Global up-regulation of chromosome 21
gene expression
in the developing Down syndrome brain
Mao et al., Genomics
Microarraydna
Check
Microarraydna
Normalize
Before
After
Differential analysis
Microarraydna
Microarraydna
The results
Ensembl Gene ID HGNC symbol Chromosome Name
1 ENSG00000060491 OGFR 20
2 ENSG00000073536 NLE1 17
3 ENSG00000115596 WNT6 2
4 ENSG00000116176 TPSG1 16
5 ENSG00000118217 ATF6 1
6 ENSG00000130640 TUBGCP2 10
7 ENSG00000131096 PYY 17
8 ENSG00000132507 EIF5A 17
9 ENSG00000135823 STX6 1
10 ENSG00000137504 CREBZF 11
11 ENSG00000141959 PFKL 21
12 ENSG00000142168 SOD1 21
13 ENSG00000143184 XCL1 1
14 ENSG00000154719 MRPL39 21
15 ENSG00000154723 ATP5J 21
16 ENSG00000155313 USP25 21
17 ENSG00000156256 USP16 21
18 ENSG00000157538 DSCR3 21
19 ENSG00000159140 SON 21
20 ENSG00000159147 DONSON 21
21 ENSG00000159788 RGS12 4
22 ENSG00000159961 OR3A3 17
23 ENSG00000160209 PDXK 21
24 ENSG00000160213 CSTB 21
25 ENSG00000160221 C21orf33 21
26 ENSG00000160294 MCM3AP 21
27 ENSG00000167515 TRAPPC2L 16
Microarraydna
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Microarraydna