RAI2

gene
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Summary

RAI2 (retinoic acid induced 2, HGNC:9835) is a protein-coding gene on chromosome Xp22.13, encoding Retinoic acid-induced protein 2 (Q9Y5P3).

Retinoic acid plays a critical role in development, cellular growth, and differentiation. The specific function of this retinoic acid-induced gene has not yet been determined but it may play a role in development. The chromosomal location of this gene designates it to be a candidate for diseases such as Nance-Horan syndrome, sensorineural deafness, non-specific X-linked cognitive disability, oral-facial-digital syndrome, and Fried syndrome. Alternate splicing results in multiple transcript variants.

Source: NCBI Gene 10742 — RefSeq curated summary.

At a glance

  • Gene–disease (curated): congenital heart disease (Disputed, ClinGen)
  • GWAS associations: 1
  • Clinical variants (ClinVar): 128 total — 1 pathogenic
  • Phenotypes (HPO): 1
  • MANE Select transcript: NM_021785

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:9835
Approved symbolRAI2
Nameretinoic acid induced 2
LocationXp22.13
Locus typegene with protein product
StatusApproved
Ensembl geneENSG00000131831
Ensembl biotypeprotein_coding
OMIM300217
Entrez10742

Gene structure

Transcript identifiers

Ensembl transcripts: 21 — 21 protein_coding

ENST00000331511, ENST00000360011, ENST00000415486, ENST00000451717, ENST00000509491, ENST00000545871, ENST00000871541, ENST00000871542, ENST00000871543, ENST00000871544, ENST00000871545, ENST00000871546, ENST00000871547, ENST00000871548, ENST00000871549, ENST00000871550, ENST00000951757, ENST00000951758, ENST00000951759, ENST00000951760, ENST00000951761

RefSeq mRNA: 4 — MANE Select: NM_021785 NM_001172732, NM_001172739, NM_001172743, NM_021785

CCDS: CCDS14183, CCDS55374

Canonical transcript exons

ENST00000451717 — 2 exons

ExonStartEnd
ENSE000032840641786109817861298
ENSE000038490711780004917802034

Expression profiles

Bgee: expression breadth ubiquitous, 260 present calls, max score 95.91.

FANTOM5 (CAGE): breadth broad, TPM avg 3.3628 / max 97.3259, expressed in 676 samples.

FANTOM5 promoters (4 alternative TSS)

Promoter IDTPM avgSamples expressed
1985842.1505564
1985820.6505271
1985830.4516233
1985810.110252

Top tissues by expression

282 total, by Bgee expression score (0-100, higher = more expressed):

TissueAnatomy IDExpression scoreQuality
left uterine tubeUBERON:000130395.91gold quality
urethraUBERON:000005795.37gold quality
right lungUBERON:000216794.93gold quality
endocervixUBERON:000045894.91gold quality
body of uterusUBERON:000985394.88gold quality
saphenous veinUBERON:000731894.56gold quality
mucosa of stomachUBERON:000119994.11gold quality
left ovaryUBERON:000211993.64gold quality
vena cavaUBERON:000408793.50gold quality
deciduaUBERON:000245093.39gold quality
myometriumUBERON:000129693.18gold quality
right ovaryUBERON:000211893.11gold quality
ectocervixUBERON:001224992.55gold quality
lower lobe of lungUBERON:000894992.49gold quality
subcutaneous adipose tissueUBERON:000219092.30gold quality
esophagogastric junction muscularis propriaUBERON:003584191.93gold quality
lower esophagus muscularis layerUBERON:003583391.79gold quality
seminal vesicleUBERON:000099891.74gold quality
lower esophagusUBERON:001347391.74gold quality
cardia of stomachUBERON:000116291.40gold quality
right atrium auricular regionUBERON:000663191.40gold quality
right uterine tubeUBERON:000130291.39gold quality
peritoneumUBERON:000235891.39gold quality
omental fat padUBERON:001041491.38gold quality
cardiac atriumUBERON:000208191.27gold quality
popliteal arteryUBERON:000225091.25gold quality
tibial arteryUBERON:000761091.23gold quality
adipose tissue of abdominal regionUBERON:000780891.22gold quality
aortaUBERON:000094791.03gold quality
fundus of stomachUBERON:000116090.93gold quality

Single-cell (SCXA)

Detected in 1 experiment(s), a significant marker in 1.

ExperimentMarker?Max mean expression
E-ANND-3yes13.72

Regulation

Is transcription factor: no

miRNA regulators (miRDB)

66 targeting RAI2, top 30 by miRDB confidence (max_score; target_count = how many genes the miRNA targets in total — lower means more specific):

miRNAMax scoreAvg scoremiRNA target_count
HSA-MIR-3613-3P100.0076.367965
HSA-MIR-5692A100.0074.406850
HSA-MIR-548AW99.9972.573559
HSA-MIR-485-3P99.9870.681585
HSA-MIR-539-3P99.9870.741616
HSA-MIR-19A-3P99.9875.332762
HSA-MIR-19B-3P99.9875.442754
HSA-MIR-568899.9673.234504
HSA-MIR-495-3P99.9672.814197
HSA-MIR-9-3P99.9670.882068
HSA-MIR-548AA99.9670.643753
HSA-MIR-548AP-3P99.9670.643753
HSA-MIR-548T-3P99.9670.643753
HSA-MIR-1468-3P99.9672.743797
HSA-MIR-6835-3P99.9370.492904
HSA-MIR-454-3P99.9174.011925
HSA-MIR-7-1-3P99.9171.534384
HSA-MIR-7-2-3P99.9171.404394
HSA-MIR-130A-3P99.9073.311861
HSA-MIR-130B-3P99.9073.271850
HSA-MIR-301A-3P99.9073.151839
HSA-MIR-301B-3P99.9073.191836
HSA-MIR-366699.9073.241833
HSA-MIR-429599.9073.111838
HSA-MIR-579-3P99.8671.663628
HSA-MIR-664B-3P99.8471.653590
HSA-MIR-548AJ-5P99.7871.123085
HSA-MIR-548F-5P99.7871.023093
HSA-MIR-548G-5P99.7871.123085
HSA-MIR-548X-5P99.7871.123085

Literature-anchored findings (GeneRIF, showing 6)

  • We specified the role of the RAI2 protein to function as a transcriptional regulator that controls the expression of several key regulators of breast epithelial integrity and cancer. (PMID:25716347)
  • Here, we report a microdeletion of 170,6 Kb at Xp22.13 (17.733.948-17.904.576) (GRCh37/hg19).The microdeletion harbors the NHS, SCLML1, and RAI2 genes and results in a phenotype consistent with Nance-Horan syndromesyndrome and developmental delay. (PMID:28464487)
  • RAI2 is frequently methylated in colorectal cancer, and its expression is regulated by promoter region methylation. Methylation of RAI2 is an independent prognostic marker of poor survival. RAI2 suppresses CRC cell growth both in vitro and in vivo. RAI2 induces cell apoptosis and suppresses CRC cell migration and invasion. RAI2 may serve as a tumor suppressor by inhibiting the AKT signaling pathway in CRC. (PMID:29796120)
  • Low RAI2 expression is a marker of poor prognosis in breast cancer. (PMID:33782811)
  • Expression Patterns and Corepressor Function of Retinoic Acid-induced 2 in Prostate Cancer. (PMID:35652463)
  • EZH2 affects malignant progression and DNA damage repair of lung adenocarcinoma cells by regulating RAI2 expression. (PMID:35939884)

Cross-species orthologs

3 orthologs

OrganismSymbolGene ID
mus_musculusRai2ENSMUSG00000043518
rattus_norvegicusRai2ENSRNOG00000006670
drosophila_melanogasterSobpFBGN0033654

Paralogs (1): SOBP (ENSG00000112320)

Protein

Protein identifiers

Retinoic acid-induced protein 2Q9Y5P3 (reviewed: Q9Y5P3)

All UniProt accessions (2): Q9Y5P3, R4GNA9

Isoforms (2)

UniProt IDNamesCanonical?
Q9Y5P3-11yes
Q9Y5P3-22

RefSeq proteins (4): NP_001166203, NP_001166210, NP_001166214, NP_068557* (*=MANE)

Domains & families (InterPro)

IDNameType
IPR026092RAI2/SOBPFamily

Pfam: PF15279

UniProt features (6 total): sequence variant 2, chain 1, region of interest 1, compositionally biased region 1, splice variant 1

Structure

Experimental structures (PDB)

2 structures.

PDBMethodResolution (Å)
8ATIX-RAY DIFFRACTION2.6
8ARIELECTRON MICROSCOPY3

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-Q9Y5P3-F150.270.00

Function

Pathways and Gene Ontology

Reactome pathways

0 pathways

MSigDB gene sets: 109 (showing top): GOBP_EMBRYO_DEVELOPMENT_ENDING_IN_BIRTH_OR_EGG_HATCHING, SRF_Q5_01, FINAK_BREAST_CANCER_SDPP_SIGNATURE, WCTCNATGGY_UNKNOWN, CREIGHTON_ENDOCRINE_THERAPY_RESISTANCE_5, HELLER_HDAC_TARGETS_SILENCED_BY_METHYLATION_UP, GOBP_EMBRYO_DEVELOPMENT, VECCHI_GASTRIC_CANCER_EARLY_DN, LEE_AGING_MUSCLE_DN, RIGGINS_TAMOXIFEN_RESISTANCE_DN, TTTGCAC_MIR19A_MIR19B, TGGAAA_NFAT_Q4_01, MASSARWEH_TAMOXIFEN_RESISTANCE_UP, CAGCTTT_MIR320, BOQUEST_STEM_CELL_CULTURED_VS_FRESH_UP

GO Biological Process (2): embryo development ending in birth or egg hatching (GO:0009792), animal organ development (GO:0048513)

GO Molecular Function (1): protein binding (GO:0005515)

GO Cellular Component (1): nucleus (GO:0005634)

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
embryo development1
anatomical structure development1
binding1
intracellular membrane-bounded organelle1

Protein interactions and networks

STRING

896 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
RAI2NHSQ6T4R5952
RAI2CDKL5O76039776
RAI2GCNT2Q8N0V5553
RAI2REPS2Q8NFH8512
RAI2LMBRD2Q68DH5479
RAI2SCML2Q9UQR0453
RAI2DEPDC1BQ8WUY9449
RAI2PALM2AKAP2Q9Y2D5411
RAI2BEND2Q8NDZ0398
RAI2TRIM3O75382393
RAI2RWDD2AQ9UIY3390
RAI2MEAK7Q6P9B6371
RAI2TRIM41Q8WV44366
RAI2CAPSLQ8WWF8365
RAI2CDC42SE2Q9NRR3363

IntAct

71 interactions, top by confidence:

ABTypeScore
CTBP1ZEB2psi-mi:“MI:0914”(association)0.800
RAI2FHL2psi-mi:“MI:0915”(physical association)0.780
FHL2RAI2psi-mi:“MI:0915”(physical association)0.780
SGTBRAI2psi-mi:“MI:0915”(physical association)0.740
RAI2SGTBpsi-mi:“MI:0915”(physical association)0.740
CTBP2RAI2psi-mi:“MI:0915”(physical association)0.670
RAI2CTBP2psi-mi:“MI:0915”(physical association)0.670
CTBP1RAI2psi-mi:“MI:0915”(physical association)0.590
CTBP2RAI2psi-mi:“MI:0915”(physical association)0.560
RAI2CTBP2psi-mi:“MI:0915”(physical association)0.560
UBQLN1RAI2psi-mi:“MI:0915”(physical association)0.560
DR1RAI2psi-mi:“MI:0915”(physical association)0.560
RAI2psi-mi:“MI:0915”(physical association)0.560
RAI2HSPB1psi-mi:“MI:0915”(physical association)0.560
RAI2NEFLpsi-mi:“MI:0915”(physical association)0.560
RAI2PRPS1psi-mi:“MI:0915”(physical association)0.560
RAI2WFS1psi-mi:“MI:0915”(physical association)0.560
RAI2GTF3C3psi-mi:“MI:0915”(physical association)0.560
RAI2KIF1Bpsi-mi:“MI:0915”(physical association)0.560
RNF11RAI2psi-mi:“MI:0915”(physical association)0.560

BioGRID (31): RAI2 (Two-hybrid), RAI2 (Two-hybrid), SGTB (Two-hybrid), RAI2 (Two-hybrid), SGTB (Two-hybrid), RAI2 (Two-hybrid), RAI2 (Two-hybrid), RAI2 (Two-hybrid), RAI2 (Two-hybrid), UBQLN1 (Two-hybrid), RAI2 (Two-hybrid), RAI2 (Two-hybrid), RAI2 (Two-hybrid), CRYGS (Affinity Capture-MS), RNF114 (Affinity Capture-MS)

ESM2 similar proteins: A0JME2, A5D7F6, F8VPZ9, O88873, O89090, P08047, P31367, P52591, P54253, P58929, P70178, P78364, Q01714, Q02086, Q07916, Q08E26, Q13227, Q14863, Q2VPU4, Q3U182, Q5E9U0, Q64028, Q66JY2, Q6AI39, Q6T264, Q7Z3K3, Q8BLM0, Q8BZH4, Q8CHH5, Q8CHP6, Q8IXK0, Q8IZL2, Q8K3Z9, Q8K4J6, Q8N196, Q8N1G0, Q8NDX5, Q8QHL5, Q8VHG2, Q91VX2

Diamond homologs: A5X7A0, A7XYH5, A7XYH9, A7XYI6, A7XYJ6, A7XYQ1, Q0P5V2, Q9Y5P3, Q9QVY8

SIGNOR signaling

0 interactions.

Disease & clinical

Clinical variants and AI predictions

ClinVar

128 variants total. Per-class counts are floors (≥ shown; pagination cap):

ClassificationCount (floor)
Pathogenic1
Likely pathogenic0
Uncertain significance74
Likely benign6
Benign5

Top pathogenic / likely-pathogenic (1)

Variant IDHGVSClassification
3024649GRCh37/hg19 Xp22.2-22.13(chrX:16582625-18323335)x0Pathogenic

SpliceAI

907 predictions. Top by Δscore:

VariantEffectΔscore
X:17802030:TTGGC:Tacceptor_gain1.0000
X:17802031:TGGC:Tacceptor_gain1.0000
X:17802032:GGC:Gacceptor_gain1.0000
X:17802033:GC:Gacceptor_gain1.0000
X:17802034:CC:Cacceptor_gain1.0000
X:17802034:CCTGC:Cacceptor_loss1.0000
X:17802035:C:CCacceptor_gain1.0000
X:17802036:T:Cacceptor_loss1.0000
X:17860508:CCCGG:Cdonor_gain1.0000
X:17860583:TTCC:Tdonor_gain1.0000
X:17802039:A:Tacceptor_gain0.9900
X:17802041:C:CTacceptor_gain0.9900
X:17802044:A:Tacceptor_gain0.9900
X:17860503:ACTC:Adonor_loss0.9900
X:17860504:CT:Cdonor_loss0.9900
X:17860505:TCA:Tdonor_loss0.9900
X:17860506:CACC:Cdonor_loss0.9900
X:17860507:A:ACdonor_gain0.9900
X:17860507:AC:Adonor_gain0.9900
X:17860508:C:CCdonor_gain0.9900
X:17860508:C:CGdonor_loss0.9900
X:17860508:CC:Cdonor_gain0.9900
X:17860582:TTTC:Tdonor_gain0.9900
X:17860584:T:Adonor_gain0.9900
X:17802038:C:CTacceptor_gain0.9800
X:17802043:C:CTacceptor_gain0.9800
X:17844026:CAG:Cdonor_gain0.9800
X:17860580:A:Cdonor_gain0.9800
X:17860354:C:CAdonor_gain0.9700
X:17802033:GCCT:Gacceptor_gain0.9600

AlphaMissense

0 scored. Top likely-pathogenic:

dbSNP variants (sampled 300 via entrez): RS1000008884 (X:17808213 C>A), RS1000053265 (X:17811360 C>T), RS1000061171 (X:17823538 G>A), RS1000148792 (X:17824762 CT>C), RS1000277819 (X:17832296 C>A,T), RS1000308353 (X:17837933 G>A), RS1000401706 (X:17855930 A>C), RS1000470081 (X:17846562 C>T), RS1000470958 (X:17828422 C>T), RS1000553010 (X:17818681 G>A), RS1000668514 (X:17822510 T>A), RS1000889262 (X:17862225 A>C), RS1000912105 (X:17862866 G>A,C), RS1000977870 (X:17800013 A>G), RS1000984218 (X:17819010 C>G,T)

Disease associations

OMIM: gene MIM:300217 | disease phenotypes:

GenCC curated gene-disease

DiseaseClassificationInheritance
congenital heart diseaseDisputed EvidenceAutosomal dominant

ClinGen Gene-Disease Validity (1)

Expert-panel classifications — Definitive > Strong > Moderate > Limited > Disputed > Refuted.

DiseaseClassificationInheritance
congenital heart diseaseDisputedAD

Mondo (2): dextrocardia (MONDO:0015661), congenital heart disease (MONDO:0005453)

Orphanet (1): Dextrocardia (Orphanet:1666)

HPO phenotypes

1 total (1 of 1 shown, HPO-id order):

HPOTerm
HP:0001651Dextrocardia

GWAS associations

1 associations (top):

StudyTraitp-value
GCST004093_3Prostate-specific antigen levels3.000000e-15

MeSH disease descriptors (2)

DescriptorNameTree numbers
D003914DextrocardiaC14.240.400.280; C14.280.400.280; C16.131.240.400.280; C16.131.810.250
D006330Heart Defects, CongenitalC14.240.400; C14.280.400; C16.131.240.400

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

PharmGKB: 1 entry (VIP=true, CPIC=false)

CTD chemical–gene interactions

35 total (human), top 30 by PubMed support.

ChemicalActions (top 5)PubMed papers
Valproic Acidaffects expression, increases expression, increases methylation7
bisphenol Aincreases expression, affects cotreatment2
Benzo(a)pyreneaffects methylation2
Dexamethasoneincreases expression, affects cotreatment2
Phenylmercuric Acetateaffects cotreatment, decreases expression2
Silicon Dioxideincreases expression2
Tetrachlorodibenzodioxinincreases expression, decreases expression2
Tretinoindecreases expression, increases expression2
Cyclosporinedecreases expression2
Aflatoxin B1decreases methylation, increases methylation2
p-Chloromercuribenzoic Aciddecreases expression, affects cotreatment2
trichostatin Aincreases expression1
sodium arseniteincreases expression1
butyraldehydeincreases expression1
mercuric bromideaffects cotreatment, decreases expression1
CGP 52608affects binding, increases reaction1
4-(5-benzo(1,3)dioxol-5-yl-4-pyridin-2-yl-1H-imidazol-2-yl)benzamideaffects cotreatment, decreases expression1
abrineincreases expression1
dorsomorphinaffects cotreatment, decreases expression1
Resveratroldecreases expression, affects cotreatment1
Zoledronic Acidincreases expression1
Acetaminophendecreases expression1
Calcitriolincreases expression, affects cotreatment1
Copperaffects binding, decreases expression1
Disulfiramaffects binding, decreases expression1
Doxorubicindecreases expression1
Indomethacinaffects cotreatment, increases expression1
Phthalic Acidsdecreases methylation1
Plant Extractsaffects cotreatment, decreases expression1
Testosteroneincreases expression, affects cotreatment1

Clinical trials (associated diseases)

300 trials via MONDO — disease-level, not drug-specific.

TrialPhaseStatusTitle
NCT00668824PHASE4UNKNOWNImproved Diagnosis of Congenital Heart Disease by Magnetic Resonance Imaging Using Vasovist
NCT01368705PHASE4COMPLETEDNitrogen Balance in Infants After Post Cardiothoracic Surgery
NCT01619982PHASE4COMPLETEDPre-operative Prophylaxis With Vancomycin and Cefazolin in Pediatric Cardiovascular Surgery Patients
NCT02122679PHASE4WITHDRAWNTranexamic Acid Effect on Platelet Aggregation Following Infant Cardiopulmonary Bypass
NCT02527811PHASE4UNKNOWNUlinastatin Injection in in Pediatric Patients Undergoing Open Heart Surgery
NCT03014700PHASE4COMPLETEDFibrinogen Concentrate vs Cryoprecipitate
NCT03408340PHASE4TERMINATEDParavertebral Nerve Blocks in Neonates
NCT03630796PHASE4UNKNOWNEffect of Sevoflurane in Postoperative Troponin I Levels in Children Undergoing Congenital Heart Defects Surgery
NCT03667703PHASE4COMPLETEDStress Ulcer Prophylaxis Versus Placebo in Critically Ill Infants With Congenital Heart Disease
NCT04453761PHASE4UNKNOWNThiamine Influenced on Substrate Energy Effectiveness in Indonesian Children Undergoing Cardiopulmonary Bypass
NCT06668389PHASE4RECRUITINGSodium-Glucose Cotransporter 2 Inhibitors for Repaired Tetralogy of Fallot Patients for Enhancement of Cardio-Pulmonary Status Trial
NCT07499154PHASE4NOT_YET_RECRUITINGPerioperative Lidocaine for Lung Protection in Infants Undergoing Cardiac Surgery
NCT00000470PHASE3COMPLETEDInfant Heart Surgery: Central Nervous System Sequelae of Circulatory Arrest
NCT00000494PHASE3COMPLETEDManagement of Patent Ductus in Premature Infants
NCT01134302PHASE3UNKNOWNHybrid Versus Norwood Management Strategies in Infants Undergoing Single Ventricle Palliation
NCT01607983PHASE3WITHDRAWNEffects of Pulmonary Vasodilation Upon VA Coupling in Fontan Patients
NCT01662011PHASE3UNKNOWNApplication of Neurally Adjusted Ventilatory Assist to Children After Congenital Cardiac Surgery
NCT02320669PHASE3COMPLETEDPhase 3 Triiodothyronine Supplementation for Infants After Cardiopulmonary Bypass
NCT02615262PHASE3COMPLETEDIntraoperative Dexamethasone in Pediatric Cardiac Surgery
NCT03153137PHASE3COMPLETEDClinical Study Assessing the Efficacy and Safety of Macitentan in Fontan-palliated Subjects
NCT03154476PHASE3COMPLETEDRole of Sildenafil for Fontan Associated Liver Disease (SiFALD) Study
NCT04536194PHASE3COMPLETEDDopamine Versus Norepinephrine Under General Anesthesia
NCT04702373PHASE3ACTIVE_NOT_RECRUITINGTraining in Exercise Activities and Motion for Growth (TEAM 4 Growth) RCT
NCT05049590PHASE3COMPLETEDAcute Normovolemic Hemodilution in Complex Cardiac Surgery
NCT06406517PHASE3UNKNOWNComparative Effectiveness of Gadopiclenol for Evaluation of Adult Congenital Heart Anatomy and Hemodynamics
NCT06693674PHASE3RECRUITINGEffect of Sacubitril-Valsartan on Cardiac Structure and Function
NCT06955260PHASE3NOT_YET_RECRUITINGSGLT2 Inhibition With Empagliflozin in Fontan Circulatory Failure
NCT00115375PHASE2COMPLETEDPlatelet Aggregation Inhibition in Children on Clopidogrel (PICOLO)
NCT00350220PHASE2COMPLETEDTransfusion Strategies in Pediatric Cardiothoracic Surgery
NCT00374088PHASE2COMPLETEDN-Acetylcysteine in Neonatal Congenital Heart Surgery (INACT Study)
NCT00538785PHASE2COMPLETEDA Study to Evaluate MEDI-524 In Children With Hemodynamically Significant Congenital Heart Disease
NCT00770705PHASE2WITHDRAWNParenteral Phenoxybenzamine During Congenital Heart Disease Surgery
NCT00919945PHASE2TERMINATEDImpact of Early Enteral Feeding on Splanchnic Blood Flow After Surgery for Critical Heart Disease in the Newborn
NCT01063712PHASE2COMPLETEDSafety and Effectiveness of the Device Nit-Occlud® PDA-R
NCT01069510PHASE2COMPLETEDSpironolactone in Adult Congenital Heart Disease
NCT01189981PHASE2COMPLETEDEffect of eHealth Encouragements to Intensive Exercise in Adolescents With Congenital Heart Disease
NCT01330433PHASE2COMPLETEDEffects of CoSeal on Bleeding & Adhesions in Pediatric Heart Surgery
NCT01662037PHASE2COMPLETEDBosentan Therapy in Children With Functional Single Ventricle
NCT01668264PHASE2UNKNOWNImaging Assessment of Diastolic Function
NCT01827059PHASE2UNKNOWNBosentan In Exercise Induced Pulmonary Arterial Hypertension in CongenitaL Heart diseasE