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HAL Id: hal-02516452

https://hal.univ-angers.fr/hal-02516452

Submitted on 23 Mar 2020

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Context-specific co-expression networks to explore the impact of anti-sense transcription

Marc Legeay, Béatrice Duval, Jean-Pierre Renou

To cite this version:

Marc Legeay, Béatrice Duval, Jean-Pierre Renou. Context-specific co-expression networks to explore the impact of anti-sense transcription. 13th conference on Computational Methods for Systems Biology (CMSB’15), Sep 2015, Nantes, France. 2015. �hal-02516452�

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Context-specific co-expression networks to explore the impact of anti-sense transcription

Marc Legeay

1,2

B´eatrice Duval

1

Jean-Pierre Renou

2

1

LERIA - Universit´e d’Angers - UNAM,

2 boulevard Lavoisier, 49045 Angers, Cedex 01, France

2

INSTITUT DE RECHERCHE EN HORTICULTURE ET SEMENCES (IRHS), UMR1345 INRA-Universit´e d’Angers-AgroCampus Ouest, Centre Angers-Nantes,

42 rue Georges Morel - BP 60057, 49071, Beaucouz´e, Cedex, France

Motivations

Understanding the regulation mechanisms in a cell is a key issue in bioinformatics. Anti-sense RNAs are endogenous RNA molecules whose partial or entire sequences exhibit complementarity to other transcripts. Their different functional roles are not completely known but some studies suggest that they play an important role in stress response mechanisms. A recent study with a full genome microarray for the apple has detected anti-sense transcription for 65% of expressed genes, which suggests a high potential of anti-sense regulation. Our work integrates anti-sense transcripts into context-specific gene networks and proposes a differential analysis of those networks.

Biological materials

We use microarray data of RNA extracted from the apple fruit (Malus × domestica) thanks to the chip AryANE v1.0 containing 63011 predicted sense genes and 63011 complementary anti-sense sequences. We study the fruit ripening process described by two conditions: harvest ( H ) and 60 days after harvest ( 60DAH ), and for each condition, 22 samples of apple fruit have been analyzed.

Methods

sense anti-sense sense anti-sense

Condition 1 Condition 2

genes of interest

Coexpression network Coexpression network

Module detection

Module network analysis

Module detection Functional informations

Motif detection

Module detection

Sense ontology Sense and anti-sense ontology

Revealed-by-AS terms

Terms p-values

response to cold 5.6059e-05

... ...

Figure 1: Diagram of the methods.

We start with expression data of sense and anti-sense genes in two stress-response conditions. From there, we propose five steps to analyse the role of anti-sense transcripts:

1

Identification of genes of interest: genes (sense and anti-sense) differentially expressed.

2

Functional analysis of genes of interest to com- pute the revealed-by-AS terms.

3

Contextual construction of gene network for the genes of interest. We construct a co-expression gene network for each condition from the expression of the genes of interest.

4

Module detection. In each network, we look for highly correlated genes by grouping them in mod- ules thanks to a hierarchical clustering .

5

Network analysis, this work is in progress.

Genes of interest

With a threshold of 1 log change between the two conditions, we found 931 sense (S ) and 694 anti-sense probes (AS ) differentially expressed, with among them, 200 genes (S ∪ AS ) for which both sense and anti-sense fulfill the condition.

Figure 2: Expression profile of two genes of interest.

S AS

e(gAS)=0 (731)

e(gS)=e(gAS) (196)

e(gS)=0 (494)

e(gS)≠e(gAS) (4) e(gS)≠0

(931)

e(gAS)≠0 (694)

Figure 3: Genes of interest distribution.

Functional analysis

response to heat

response to osmotic stress response to salt stress

response to wounding response to temperature stimulus

hyperosmotic response response to cold

response to disaccharide

response to cadmium ion

response to hydrogen peroxide response to metal ion response to sucrose

response to reactive oxygen species

response to karrikin

response to desiccation response to oxygen levels

response to decreased oxygen levels

response to topologically incorrect protein

response to misfolded protein response to water

response to water deprivation response to oxidative stress response to cytokinin

gibberellic acid mediated signaling pathway

defense response to bacterium defense response to other organism

defense response

systemic acquired resistance systemic acquired resistance, salicylic acid mediated signaling

pathway response to endoplasmic reticulum

stress

defense response, incompatible interaction response to abscisic acid

response to brassinosteroid response to carbohydrate

response to inorganic substance

response to gibberellin response to alcohol

response to organic cyclic compound

jasmonic acid mediated signaling pathway gibberellin mediated signaling

pathway cellular response to gibberellin

stimulus response to salicylic acid

cellular response to salicylic acid stimulus

response to abiotic stimulus

response to stress cellular response to jasmonic acid

stimulus response to jasmonic acid cellular response to organic cyclic

compound response to hormone response to acid chemical

response to oxygen-containing compound response to lipid response to nitrate

response to organic substance

pigment accumulation in response to UV light anthocyanin accumulation in tissues in response to UV light long-day photoperiodism ion transmembrane transport

ammonium transmembrane transport

pigment accumulation drug transmembrane transport

drug transport

photoperiodism

pigment accumulation in tissues in response to UV light

diterpenoid catabolic process terpenoid metabolic process

lipid oxidation cell death pigmentation

signaling

isoprenoid metabolic process

fatty acid catabolic process fatty acid metabolic process

regulation of biological quality monocarboxylic acid metabolic

process single-organism cellular process regulation of hormone levels

gibberellin catabolic process biological_process

monocarboxylic acid catabolic process

lipid modification inorganic cation transmembrane

transport

inorganic ion transmembrane transport amide transport

urea transport

urea transmembrane transport amine transport organic acid transport

organic acid transmembrane transport

ion transport

single-organism localization photoperiodism, flowering

localization

transmembrane transport

pigment accumulation in tissues long-day photoperiodism, flowering

fatty acid oxidation programmed cell death

very long-chain fatty acid metabolic process

fatty acid beta-oxidation multi-organism process

cell communication immune system process

terpenoid catabolic process

xenobiotic metabolic process single organism signaling

isoprenoid catabolic process single-organism process

diterpenoid metabolic process circadian rhythm

death

multicellular organismal process rhythmic process

cell surface receptor signaling pathway cellular response to xenobiotic

stimulus

cellular response to stimulus

response to other organism salicylic acid mediated signaling

pathway innate immune response immune response hormone-mediated signaling

pathway

signal transduction intracellular signal transduction

response to fungus response to bacterium second-messenger-mediated

signaling

MAPK cascade response to external stimulus

transmembrane receptor protein tyrosine kinase signaling pathway

response to xenobiotic stimulus

host programmed cell death induced by symbiont response to UV

response to drug

cellular response to stress plant-type hypersensitive response

response to biotic stimulus detection of biotic stimulus

response to external biotic stimulus response to stimulus

enzyme linked receptor protein signaling pathway

cellular response to chemical stimulus

response to high light intensity nonphotochemical quenching response to far red light response to red light

response to red or far red light

energy quenching

response to light intensity response to blue light

response to light stimulus response to UV-B

detection of stimulus cellular response to acid chemical

cellular response to oxygen-containing compound

response to endogenous stimulus cellular response to organic substance cellular response to endogenous

stimulus response to chemical

cellular response to lipid

cellular response to hormone stimulus response to nitrogen compound

response to radiation calcium ion transport

L-amino acid transport L-arginine import

arginine import

transition metal ion transport L-amino acid import

amino acid import L-arginine transport

dicarboxylic acid transport

arginine transport

divalent inorganic cation transport dipeptide transport

neutral amino acid transport

oligopeptide transport

basic amino acid transport

metal ion transport

proline transport amino acid transport

divalent metal ion transport

cation transport

cation transmembrane transport ammonium transport

monovalent inorganic cation transport

anion transmembrane transport organic substance transport

glycerol transport

organic anion transport carboxylic acid transport myo-inositol transport

peptide transport

polyol transport nectar secretion

nitrogen compound transportanion transport inorganic anion transport

nitrate transport

organic cation transport

methylammonium transport

intracellular transport

protein targeting

establishment of protein localization

single-organism transport single-organism intracellular

transport intracellular protein transport

protein localization protein transportfluid transport

one-carbon compound transport carbohydrate transport

secretion water transport

transport organic hydroxy compound

transport

cation homeostasis

vegetative to reproductive phase transition of meristem

single-organism cellular localization protein localization to membrane seedling developmentcellular ion homeostasis

macromolecule localization cellular protein localization

establishment of localization establishment of protein

localization to membrane

cellular localization establishment of localization in cell

cellular cation homeostasis cellular macromolecule localization protein targeting to membrane

root epidermal cell differentiation

plant epidermal cell differentiation

root hair cell development plant epidermis development

trichoblast differentiation

trichoblast maturation root hair cell differentiation

anatomical structure morphogenesis

cellular developmental processmultidimensional cell growth single-organism developmental

process

developmental cell growth developmental growth

developmental process meristem development

root development

root morphogenesis

developmental maturation aging anatomical structure development anatomical structure maturation

organ development root system development

tissue development androecium development phyllome development

cell growth gibberellin metabolic process

carboxylic acid metabolic process cellular component morphogenesis

organelle organization unidimensional cell growth

membrane organization

plastid organization monocarboxylic acid biosynthetic

process cellular chemical homeostasis

reproductive process

homeostatic process single-organism membrane

organization

cellular homeostasis chemical homeostasis

meristem maintenance

growth single-multicellular organism

process fruit development

shoot system development system development

post-embryonic organ development reproductive system development

flower development

stamen development

fruit ripening

cell maturation cell differentiationcell development

root hair elongation developmental growth involved in

morphogenesis

cell morphogenesis

floral whorl development

anther development floral organ development

post-embryonic development

single organism reproductive process reproductive structure development

developmental process involved in reproduction reproductive shoot system

development ion homeostasis

multicellular organismal development

cellular modified amino acid biosynthetic process

heterocycle metabolic process

organic cyclic compound catabolic process

heterocycle catabolic process organonitrogen compound

metabolic process

cellular nitrogen compound metabolic process carbohydrate biosynthetic process

cellular macromolecule catabolic process purine nucleoside metabolic

process carbohydrate catabolic process carbohydrate metabolic process

macromolecule biosynthetic process

purine ribonucleoside metabolic process

pyridine-containing compound metabolic process purine-containing compound

metabolic process nucleobase-containing compound

metabolic process

allantoin catabolic process sulfur compound metabolic process

aromatic amino acid family metabolic process

reductive pentose-phosphate cycle generation of precursor metabolites and energy

allantoin metabolic process catabolic process

cellular modified amino acid metabolic process nitrogen compound metabolic

process glycosyl compound biosynthetic

process cellular aromatic compound

metabolic process

organonitrogen compound catabolic process

amine metabolic process heterocycle biosynthetic process

cytokinin metabolic process

photosynthesis

photosynthesis, dark reaction cell wall organization or biogenesis

single-organism carbohydrate catabolic process organic substance metabolic

process cellular catabolic process cellular metabolic process

carbohydrate derivative biosynthetic process

glycosyl compound metabolic process

organic cyclic compound metabolic process primary metabolic process

organic substance biosynthetic process

single-organism carbohydrate metabolic process

organic substance catabolic process thioester metabolic process

nucleoside metabolic process

flavonoid metabolic processorganophosphate biosynthetic process steroid biosynthetic process

protein phosphorylation inositol phosphate metabolic

process

flavonoid biosynthetic process

sterol metabolic process

steroid metabolic process alcohol biosynthetic process

biological regulation alcohol metabolic process

coenzyme metabolic process glycoprotein catabolic process

nucleotide metabolic process

oxidoreduction coenzyme metabolic process macromolecule modification protein metabolic process carbohydrate derivative catabolic

process

macromolecule catabolic process

cellular protein metabolic process ribonucleoside metabolic processnicotinamide nucleotide metabolic

process

glycoprotein metabolic process

pyridine nucleotide metabolic process

purine ribonucleotide metabolic process cofactor metabolic process

ribose phosphate metabolic process phosphate-containing compound

metabolic process organophosphate metabolic

process

glyceraldehyde-3-phosphate metabolic process

glucose 6-phosphate metabolic process

nucleoside phosphate metabolic process

purine ribonucleoside monophosphate metabolic process pyruvate metabolic process

organic hydroxy compound metabolic process lipid biosynthetic process

small molecule biosynthetic process cellular lipid catabolic process

small molecule metabolic process organic hydroxy compound

biosynthetic process

polyol metabolic process regulation of meristem growth

anthocyanin-containing compound metabolic process pigment metabolic process phytosteroid biosynthetic process

anthocyanin-containing compound biosynthetic process

phytosteroid metabolic process brassinosteroid metabolic process

brassinosteroid biosynthetic process

signal transduction by protein phosphorylation

ribonucleotide metabolic process

NADP metabolic process acyl-CoA metabolic processcellular protein modification

process

acetyl-CoA metabolic process pentose-phosphate shunt

protein modification process protein catabolic process phosphorus metabolic process carbohydrate derivative metabolic

process glycolytic process lipid catabolic process nucleobase-containing small molecule metabolic process

cytokinin catabolic process lignin biosynthetic process

sulfur amino acid metabolic process cellular amino acid biosynthetic

process

photosynthetic electron transport chain cellular metabolic compound

salvage

external encapsulating structure organization cellular amino acid catabolic

process cellular component organization Golgi organization

glucosinolate metabolic process endomembrane system

organization

alpha-amino acid biosynthetic process

cysteine biosynthetic process serine family amino acid

biosynthetic process

macromolecular complex subunit organization glycine catabolic process

glycine metabolic process

serine family amino acid catabolic process

serine family amino acid metabolic process

glycine decarboxylation via glycine cleavage system

alpha-amino acid catabolic process

polyamine catabolic process proteasome core complex assembly

cellular biogenic amine catabolic process

cellular biogenic amine metabolic process proteasome assembly

photosynthesis, light harvesting in photosystem I photosynthetic electron transport

in photosystem I cellular component biogenesis photorespiration

glucosinolate biosynthetic process alpha-amino acid metabolic process cysteine metabolic process

amine catabolic process cellular component assembly

sulfur amino acid biosynthetic process

cellular macromolecular complex assembly

cellular protein complex assembly protein complex subunit organization

macromolecular complex assembly

protein complex assembly

photosystem II assembly protein complex biogenesis

polyamine metabolic process cell wall modification

plant-type cell wall organization

gluconeogenesis hexose biosynthetic process

cell wall pectin metabolic process

plant-type cell wall loosening glucose metabolic process plant-type cell wall modification

photosynthesis, light harvesting

cell wall organization

plant-type cell wall organization or biogenesis photosynthesis, light reaction

cellular amine metabolic process ribonucleoprotein complex

biogenesis

phenylpropanoid biosynthetic process carboxylic acid biosynthetic process cellular component organization or

biogenesis

oxoacid metabolic process hormone metabolic process cellular process lignin metabolic process

secondary metabolic process oxidation-reduction process carboxylic acid catabolic process

electron transport chain

hormone catabolic processsecondary metabolite biosynthetic process glycosinolate metabolic process

phenylpropanoid metabolic process biosynthetic process

organic acid biosynthetic process toxin metabolic process

secondary metabolite catabolic process

metabolic process organic acid metabolic process

organic cyclic compound biosynthetic process

organic acid catabolic process benzene-containing compound

metabolic process aromatic compound biosynthetic

process

pigment biosynthetic process single-organism metabolic process

salicylic acid metabolic process

lipid metabolic process hormone biosynthetic process

cellular aldehyde metabolic process salicylic acid biosynthetic process

small molecule catabolic process phenol-containing compound

biosynthetic process cellular lipid metabolic process

cellular hormone metabolic process glycosinolate biosynthetic process

coumarin biosynthetic process

cellular amino acid metabolic process

organonitrogen compound biosynthetic process

S-glycoside biosynthetic process coumarin metabolic process

cellular biosynthetic process sulfur compound biosynthetic

process

single-organism catabolic process phenol-containing compound

metabolic process

toxin catabolic process S-glycoside metabolic process

carbon fixation single-organism biosynthetic

process

regulation of innate immune response

regulation of defense response regulation of plant-type hypersensitive response

regulation of phosphate metabolic process regulation of hydrogen peroxide metabolic process regulation of programmed cell

death

regulation of protein modification process negative regulation of protein

metabolic process

regulation of dephosphorylation regulation of proteolysis

regulation of protein dephosphorylation negative regulation of proteolysis

negative regulation of autophagy regulation of peptidase activity

negative regulation of peptidase activity

negative regulation of catabolic process positive regulation of biosynthetic

process

regulation of cellular catabolic process regulation of biosynthetic processregulation of macromolecule

metabolic process regulation of primary metabolic

process regulation of multicellular

organismal process

regulation of biological process regulation of cellular process

regulation of localization

regulation of immune system process

positive regulation of biological process

regulation of response to stimulus

negative regulation of cellular process negative regulation of biological

process

negative regulation of defense response

regulation of phosphorus metabolic process regulation of response to stress

regulation of proton transport

regulation of reactive oxygen species metabolic process regulation of photosynthesis regulation of ion transport

negative regulation of cellular catabolic process

regulation of autophagy regulation of protein metabolic

process regulation of flavonoid biosynthetic

process regulation of hydrolase activity

regulation of cellular protein metabolic process

positive regulation of flavonoid biosynthetic process

negative regulation of cellular protein metabolic process negative regulation of hydrolase

activity

negative regulation of macromolecule metabolic process negative regulation of catalytic

activity positive regulation of catalytic

activity regulation of catalytic activity

regulation of catabolic process regulation of cellular metabolic

process

negative regulation of metabolic process positive regulation of metabolic

process

regulation of metabolic process

negative regulation of cellular metabolic process regulation of multicellular

organismal development

regulation of developmental process myo-inositol hexakisphosphate

biosynthetic process

regulation of growth cholesterol metabolic process

cholesterol biosynthetic process

inositol phosphate biosynthetic process

polyol biosynthetic process

phosphorylation regulation of developmental growth regulation of meristem

development sterol biosynthetic process

myo-inositol hexakisphosphate metabolic process

nucleoside monophosphate metabolic process

negative regulation of molecular function ribonucleoside monophosphate

metabolic process

positive regulation of molecular function regulation of molecular function

purine nucleoside monophosphate metabolic process

negative regulation of response to stimulus regulation of immune response regulation of cellular response to

stress regulation of cell death regulation of transport

pectin metabolic process

cellulose metabolic process

beta-glucan metabolic process galacturonan metabolic process

plant-type cell wall cellulose metabolic process

rRNA processing

gene expression cellular polysaccharide metabolic

process RNA metabolic process ribosome biogenesis

cell wall polysaccharide metabolic process hexose metabolic process

ncRNA processing

starch metabolic process RNA processing

cellular glucan metabolic process

rRNA metabolic process glucan metabolic process

ncRNA metabolic process monosaccharide biosynthetic

process

cellular amide catabolic process monosaccharide metabolic process cellular amide metabolic process

cellular nitrogen compound catabolic process

cell wall macromolecule metabolic process polysaccharide biosynthetic process

macromolecule metabolic process cellular macromolecule metabolic

process cellular carbohydrate metabolic

process

polysaccharide metabolic process nucleic acid metabolic process

purine nucleotide metabolic process

Figure 4: Ontology of all the genes of interest.

transition metal ion transport L-arginine transport

neutral amino acid transport

calcium ion transport arginine import

L-arginine import

fatty acid oxidation

fatty acid catabolic process lipid oxidation

fatty acid beta-oxidation

anthocyanin-containing compound biosynthetic process very long-chain fatty acid metabolic process

signal transduction by protein phosphorylation

detection of stimuluscellular response to salicylic acid stimulus

defense response to bacterium salicylic acid mediated signaling

pathway jasmonic acid mediated signaling

pathway cellular response to jasmonic acid

stimulus

enzyme linked receptor protein signaling pathway

response to endoplasmic reticulum stress transmembrane receptor protein

tyrosine kinase signaling pathway

defense response to other organism

response to hydrogen peroxide

response to water

response to topologically incorrect protein response to oxidative stress

response to heat response to cold response to water deprivation

response to oxygen levels nonphotochemical quenching

energy quenching

response to high light intensity

drug transport

drug transmembrane transport monovalent inorganic cation

transport

cation transmembrane transport

photoperiodism

regulation of meristem development

regulation of developmental growth cholesterol metabolic process

regulation of developmental process regulation of multicellular organismal development protein phosphorylation

phosphorylation MAPK cascade

cholesterol biosynthetic process

positive regulation of metabolic process

negative regulation of defense response positive regulation of molecular

function

regulation of photosynthesis positive regulation of biological

process

negative regulation of response to stimulus acetyl-CoA metabolic process

regulation of response to stimulus

positive regulation of catalytic activity

negative regulation of hydrolase activity

negative regulation of catabolic process

regulation of phosphorus metabolic process

negative regulation of proteolysis regulation of peptidase activity

regulation of phosphate metabolic process

negative regulation of autophagy

negative regulation of peptidase activity

hyperosmotic response response to desiccation response to decreased oxygen

levels

response to misfolded protein

S-glycoside biosynthetic process secondary metabolite catabolic

process glycosinolate metabolic process

glycosinolate biosynthetic process

aromatic amino acid family metabolic process cellular biosynthetic process

growth meristem development

cell growth single-organism membrane

organization

meristem maintenance anatomical structure maturation

cellular component morphogenesis cellular developmental process

membrane organization

plastid organization cell morphogenesis

glycine decarboxylation via glycine cleavage system

macromolecular complex subunit organization

photorespiration

cellular metabolic compound salvage

glucosinolate biosynthetic process glucosinolate metabolic process

dicarboxylic acid transport

single-organism intracellular transport myo-inositol transport

carbohydrate transport polyol transport

intracellular transport

reproductive system development

shoot system development

post-embryonic development vegetative to reproductive phase

transition of meristem

anther development developmental process involved in

reproduction reproductive structure development

fruit ripening

glucose metabolic process ribosome biogenesis

ncRNA processing hexose biosynthetic process

cellulose metabolic process hexose metabolic process

gluconeogenesis

toxin catabolic process phenol-containing compound

metabolic process photoperiodism, flowering

S-glycoside metabolic process salicylic acid metabolic process phenol-containing compound

biosynthetic process multicellular organismal process

rhythmic process

salicylic acid biosynthetic process organic acid transmembrane

transport

circadian rhythm

monosaccharide biosynthetic process proteasome core complex assembly

monosaccharide metabolic process allantoin catabolic process

proteasome assembly

Figure 5: Revealed-by-AS terms.

In order to study the impact of anti-sense transcription, we compare the ontological terms significantly represented in the set S ∪ AS of sense and anti-sense genes (Figure 4) with the ontological terms significantly represented in the set S of sense genes. The difference enables to define the revealed-by-AS terms (Figure 5).

ANTISENS EVOLUTION SENS AT

MDP0000151721 -1 -1 MDP0000151721_r AT5G67590 MDP0000223905 -1 -1 MDP0000223905_r AT2G39730 MDP0000272802 -1 -1 MDP0000272802_r AT5G67590 MDP0000561026 -1 -1 MDP0000561026_r AT2G36830 MDP0000944409 -1 -1 MDP0000944409_r AT2G39730 MDP0000132480 -1 0 MDP0000132480_r AT2G27710 MDP0000134273 -1 0 MDP0000134273_r AT2G26250 MDP0000134685 -1 0 MDP0000134685_r AT4G37930 MDP0000146698 -1 0 MDP0000146698_r AT5G38480 MDP0000151190 -1 0 MDP0000151190_r AT3G24120 MDP0000169619 -1 0 MDP0000169619_r AT1G56070 MDP0000206093 -1 0 MDP0000206093_r AT4G04330 MDP0000206314 -1 0 MDP0000206314_r AT3G05890 MDP0000215630 -1 0 MDP0000215630_r AT3G51780 MDP0000224974 -1 0 MDP0000224974_r AT3G61580 MDP0000231051 -1 0 MDP0000231051_r AT2G46210 MDP0000234570 -1 0 MDP0000234570_r AT4G37930 MDP0000237499 -1 0 MDP0000237499_r AT3G23050 MDP0000268045 -1 0 MDP0000268045_r AT1G15950 MDP0000297425 -1 0 MDP0000297425_r AT4G03280 MDP0000324254 -1 0 MDP0000324254_r AT4G24960 MDP0000325574 -1 0 MDP0000325574_r AT3G62410 MDP0000325582 -1 0 MDP0000325582_r AT3G62410 MDP0000564897 -1 0 MDP0000564897_r AT2G22430 MDP0000642609 -1 0 MDP0000642609_r AT3G53990 MDP0000760376 -1 0 MDP0000760376_r AT2G46210 MDP0000777793 -1 0 MDP0000777793_r AT1G56070 MDP0000797759 -1 0 MDP0000797759_r AT2G21660 MDP0000920069 -1 0 MDP0000920069_r AT1G64060 MDP0000310152 -1 1 MDP0000310152_r AT5G65730 MDP0000126738 0 -1 MDP0000126738_r AT3G18990 MDP0000132477 0 -1 MDP0000132477_r AT4G37930 MDP0000148186 0 -1 MDP0000148186_r AT1G32060 MDP0000241245 0 -1 MDP0000241245_r AT1G49480 MDP0000244771 0 -1 MDP0000244771_r AT3G55800 MDP0000287992 0 -1 MDP0000287992_r AT1G01060 MDP0000300321 0 -1 MDP0000300321_r AT3G45140 MDP0000317816 0 -1 MDP0000317816_r AT5G01600 MDP0000321244 0 -1 MDP0000321244_r AT2G39730 MDP0000429215 0 -1 MDP0000429215_r AT2G46590 MDP0000647652 0 -1 MDP0000647652_r AT4G17090 MDP0000835914 0 -1 MDP0000835914_r AT1G42970 MDP0000122458 0 1 MDP0000122458_r AT4G25140 MDP0000205588 0 1 MDP0000205588_r AT3G11170 MDP0000210504 0 1 MDP0000210504_r AT3G01570 MDP0000253300 0 1 MDP0000253300_r AT2G38560 MDP0000302532 0 1 MDP0000302532_r AT3G18990 MDP0000671114 0 1 MDP0000671114_r AT5G54770 MDP0000813339 0 1 MDP0000813339_r AT4G34710 MDP0000151030 1 0 MDP0000151030_r AT4G25140 MDP0000191203 1 0 MDP0000191203_r AT3G16785 MDP0000253809 1 0 MDP0000253809_r AT5G65020 MDP0000281110 1 0 MDP0000281110_r AT1G22770 MDP0000728753 1 0 MDP0000728753_r AT5G06860 MDP0000766240 1 0 MDP0000766240_r AT4G01370 MDP0000836165 1 1 MDP0000836165_r AT4G02330

Figure 6: Evolution of probes associated with the term ”response to cold”.

Revealed-by-AS terms allow us to identify biological functions which could not have been noticed by enrichment analysis with- out anti-sense data.

For the dataset described before, one of the most significant revealed-by-AS terms is the term ”response to cold” (red ar- row in Figure 5). Ripening clearly involves cold reaction since between the conditions H and 60DAH, the apples are stored cold;

yet this term is not observed if we only consider the differentially expressed sense genes.

We define the evolution of a probe as the

expression difference between the two conditions with respect to a threshold of 1 log change. We observe that almost half of the probes associated with the term ”response to cold” have the same evolution pattern: the sense expression level is nearly constant between the two conditions whereas the anti-sense expression level decreases (highlighted in Figure 6). This confirms that anti- sense data provide valuable information to study this process.

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