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Title: SmallRNA analysis
Description: How to analysis SmallRNA

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Small RNA Analysis







Small single stranded RNAs (~21-25 nucleotides)
but derived from larger precursors (double
stranded RNAs)
Non-coding sequences
Form imperfect stem-loop structures (hairpin)
Negative regulators of gene expression
(Postranscriptional and Translational regulation )



The journey that led to the discovery of miRNAs
began in 1993 with the humble nematode worm
...
After some remarkable
detective work, they decided
that this RNA did not code for
any protein, but the actual role
seemed somewhat obscure

Differential expression

SmallRNA characterization

More the 1 sample, study the
up and down regulated
smallRNA expression
...
Read characterization by
mapping to a reference genome
sequence, known RNA families (e
...
,
Rfam), and known microRNA
sequences (e
...
, miRBase)

smRNA-seq
Analysis

Target gene prediction and
pathway analysis

Expression count (mature
mirRNA)

Predict the genes target and
their pathway (GO)
Novel microRNA prediction

Secondary structure criteria
and MFEI calculation

Data preparation
 Prepare and check the sequence quality
Basic Analysis
 Trim sequence adapters and low quality
sequence reads
 Merge the read and count
 Annotate by mirBase
 Produce Annotated and Un-annotated result

http://articles
...
com/sites/articles/archive/2012/02/18/eating-wrong-plants-can-mess-dnaexpression
...


Annotated result

Un-Annotated result



Formula



Information need
1
...


Number of G and C in pre-miRNA

3
...
P
...

A=17 , C=10 , G=11, T=26

Prediction of potential target of miRNAs
 Software - http://omictools
...
noble
...
genetics
...
cn/psRobot/
MAGI
http://elgar
...
edu/software/magi/index
...
ym
...
tw/ym500/index
...
cs
...
ca/~blanchem/mirdup/
CleaveLand http://axtell-lab-psu
...
com/cleaveland
...
cmp
...
ac
Title: SmallRNA analysis
Description: How to analysis SmallRNA