Human Gene TDO2 (uc003ipf.2)
  Description: Homo sapiens tryptophan 2,3-dioxygenase (TDO2), mRNA.
RefSeq Summary (NM_005651): This gene encodes a heme enzyme that plays a critical role in tryptophan metabolism by catalyzing the first and rate-limiting step of the kynurenine pathway. Increased activity of the encoded protein and subsequent kynurenine production may also play a role in cancer through the suppression of antitumor immune responses, and single nucleotide polymorphisms in this gene may be associated with autism. [provided by RefSeq, Feb 2012].
Transcript (Including UTRs)
   Position: hg19 chr4:156,824,845-156,841,558 Size: 16,714 Total Exon Count: 12 Strand: +
Coding Region
   Position: hg19 chr4:156,824,911-156,841,142 Size: 16,232 Coding Exon Count: 12 

Page IndexSequence and LinksUniProtKB CommentsPrimersGenetic AssociationsMalaCards
CTDGene AllelesRNA-Seq ExpressionMicroarray ExpressionRNA StructureProtein Structure
Other SpeciesGO AnnotationsmRNA DescriptionsPathwaysOther NamesModel Information
Methods
Data last updated at UCSC: 2013-06-14

-  Sequence and Links to Tools and Databases
 
Genomic Sequence (chr4:156,824,845-156,841,558)mRNA (may differ from genome)Protein (406 aa)
Gene SorterGenome BrowserOther Species FASTAGene interactionsTable SchemaAlphaFold
BioGPSEnsemblEntrez GeneExonPrimerGeneCardsGeneNetwork
H-INVHGNCHPRDHuman Cortex Gene ExpressionLynxMalacards
MGIneXtProtOMIMPubMedReactomeUniProtKB
WikipediaBioGrid CRISPR DB

-  Comments and Description Text from UniProtKB
  ID: T23O_HUMAN
DESCRIPTION: RecName: Full=Tryptophan 2,3-dioxygenase; Short=TDO; EC=1.13.11.11; AltName: Full=Tryptamin 2,3-dioxygenase; AltName: Full=Tryptophan oxygenase; Short=TO; Short=TRPO; AltName: Full=Tryptophan pyrrolase; AltName: Full=Tryptophanase;
FUNCTION: Incorporates oxygen into the indole moiety of tryptophan. Has a broad specificity towards tryptamine and derivatives including D- and L-tryptophan, 5-hydroxytryptophan and serotonin (By similarity).
CATALYTIC ACTIVITY: L-tryptophan + O(2) = N-formyl-L-kynurenine.
COFACTOR: Binds 2 heme groups per tetramer (By similarity).
PATHWAY: Amino-acid degradation; L-tryptophan degradation via kynurenine pathway; L-kynurenine from L-tryptophan: step 1/2.
SUBUNIT: Homotetramer (By similarity).
SIMILARITY: Belongs to the tryptophan 2,3-dioxygenase family.

-  Primer design for this transcript
 

Primer3Plus can design qPCR Primers that straddle exon-exon-junctions, which amplify only cDNA, not genomic DNA.
Click here to load the transcript sequence and exon structure into Primer3Plus

Exonprimer can design one pair of Sanger sequencing primers around every exon, located in non-genic sequence.
Click here to open Exonprimer with this transcript

To design primers for a non-coding sequence, zoom to a region of interest and select from the drop-down menu: View > In External Tools > Primer3


-  Genetic Association Studies of Complex Diseases and Disorders
  Genetic Association Database (archive): TDO2
CDC HuGE Published Literature: TDO2
Positive Disease Associations: schizophrenia | bipolar disorder , speech perception in dyslexia
Related Studies:
  1. schizophrenia | bipolar disorder
    Christine L Miller , et al. Schizophrenia research 2009 113(2-3):259-67, Two complex genotypes relevant to the kynurenine pathway and melanotropin function show association with schizophrenia and bipolar disorder., Schizophrenia research 2009 113(2-3):259-67. [PubMed 19502010]
    TDO2[CC]+MCHR2[GC]+MC5R[G, any] conferred an OR maximal for schizophrenia alone (4.84, p=0.005), carried by 8% of schizophrenia cases. For the broad diagnosis of schizophrenia plus bipolar disorder, the same genotype conferred an OR of 3.93, p= 0.014, carried by 7% of the cases. This genotype was not present in the African Americans of the study.
  2. speech perception in dyslexia
    Roeske ,et al. 2009, First genome-wide association scan on neurophysiological endophenotypes points to trans-regulation effects on SLC2A3 in dyslexic children, Molecular psychiatry 2009 . [PubMed 19786962]

-  MalaCards Disease Associations
  MalaCards Gene Search: TDO2
Diseases sorted by gene-association score: hypertryptophanemia, familial* (350), photoparoxysmal response 1 (8), parapsoriasis (6), tic disorder (5), substance abuse (5), pervasive developmental disorder (1), schizophrenia (1)
* = Manually curated disease association

-  Comparative Toxicogenomics Database (CTD)
  The following chemicals interact with this gene           more ... click here to view the complete list

+  Common Gene Haplotype Alleles
  Press "+" in the title bar above to open this section.

-  RNA-Seq Expression Data from GTEx (53 Tissues, 570 Donors)
  Highest median expression: 122.53 RPKM in Liver
Total median expression: 131.20 RPKM



View in GTEx track of Genome Browser    View at GTEx portal     View GTEx Body Map

+  Microarray Expression Data
  Press "+" in the title bar above to open this section.

-  mRNA Secondary Structure of 3' and 5' UTRs
 
RegionFold EnergyBasesEnergy/Base
Display As
5' UTR -12.2066-0.185 Picture PostScript Text
3' UTR -72.00416-0.173 Picture PostScript Text

The RNAfold program from the Vienna RNA Package is used to perform the secondary structure predictions and folding calculations. The estimated folding energy is in kcal/mol. The more negative the energy, the more secondary structure the RNA is likely to have.

-  Protein Domain and Structure Information
  InterPro Domains: Graphical view of domain structure
IPR004981 - Trp_2_3_dOase

Pfam Domains:
PF03301 - Tryptophan 2,3-dioxygenase

ModBase Predicted Comparative 3D Structure on P48775
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The pictures above may be empty if there is no ModBase structure for the protein. The ModBase structure frequently covers just a fragment of the protein. You may be asked to log onto ModBase the first time you click on the pictures. It is simplest after logging in to just click on the picture again to get to the specific info on that model.

-  Orthologous Genes in Other Species
  Orthologies between human, mouse, and rat are computed by taking the best BLASTP hit, and filtering out non-syntenic hits. For more distant species reciprocal-best BLASTP hits are used. Note that the absence of an ortholog in the table below may reflect incomplete annotations in the other species rather than a true absence of the orthologous gene.
MouseRatZebrafishD. melanogasterC. elegansS. cerevisiae
No orthologGenome BrowserGenome BrowserGenome BrowserGenome BrowserNo ortholog
Gene DetailsGene Details Gene DetailsGene Details 
Gene SorterGene Sorter Gene SorterGene Sorter 
 RGDEnsemblFlyBaseWormBase 
 Protein SequenceProtein SequenceProtein SequenceProtein Sequence 
 AlignmentAlignmentAlignmentAlignment 

-  Gene Ontology (GO) Annotations with Structured Vocabulary
  Molecular Function:
GO:0004833 tryptophan 2,3-dioxygenase activity
GO:0005515 protein binding
GO:0016491 oxidoreductase activity
GO:0016597 amino acid binding
GO:0019825 oxygen binding
GO:0020037 heme binding
GO:0042802 identical protein binding
GO:0046872 metal ion binding
GO:0051213 dioxygenase activity

Biological Process:
GO:0006568 tryptophan metabolic process
GO:0006569 tryptophan catabolic process
GO:0019441 tryptophan catabolic process to kynurenine
GO:0019442 tryptophan catabolic process to acetyl-CoA
GO:0051289 protein homotetramerization
GO:0055114 oxidation-reduction process

Cellular Component:
GO:0005829 cytosol


-  Descriptions from all associated GenBank mRNAs
  U32989 - Human tryptophan oxygenase (TDO) mRNA, complete cds.
AK307741 - Homo sapiens cDNA, FLJ97689.
AK289418 - Homo sapiens cDNA FLJ75236 complete cds, highly similar to Human tryptophan oxygenase (TDO) mRNA.
BC005355 - Homo sapiens tryptophan 2,3-dioxygenase, mRNA (cDNA clone MGC:12454 IMAGE:4071714), complete cds.
EU831460 - Synthetic construct Homo sapiens clone HAIB:100066489; DKFZo008E1217 tryptophan 2,3-dioxygenase protein (TDO2) gene, encodes complete protein.
EU831547 - Synthetic construct Homo sapiens clone HAIB:100066576; DKFZo004E1218 tryptophan 2,3-dioxygenase protein (TDO2) gene, encodes complete protein.
CU675137 - Synthetic construct Homo sapiens gateway clone IMAGE:100019265 5' read TDO2 mRNA.
HQ447298 - Synthetic construct Homo sapiens clone IMAGE:100070609; CCSB005590_01 tryptophan 2,3-dioxygenase (TDO2) gene, encodes complete protein.
KJ892263 - Synthetic construct Homo sapiens clone ccsbBroadEn_01657 TDO2 gene, encodes complete protein.
BX647341 - Homo sapiens mRNA; cDNA DKFZp779D1612 (from clone DKFZp779D1612).
JD355377 - Sequence 336401 from Patent EP1572962.
JD183331 - Sequence 164355 from Patent EP1572962.
JD166228 - Sequence 147252 from Patent EP1572962.
JD134021 - Sequence 115045 from Patent EP1572962.

-  Biochemical and Signaling Pathways
  KEGG - Kyoto Encyclopedia of Genes and Genomes
hsa00380 - Tryptophan metabolism
hsa01100 - Metabolic pathways

BioCyc Knowledge Library
NADSYN-PWY - NAD biosynthesis II (from tryptophan)
PWY-5651 - tryptophan degradation to 2-amino-3-carboxymuconate semialdehyde
TRPCAT-PWY - tryptophan degradation I (via anthranilate)
TRYPTOPHAN-DEGRADATION-1 - tryptophan degradation III (eukaryotic)

Reactome (by CSHL, EBI, and GO)

Protein P48775 (Reactome details) participates in the following event(s):

R-HSA-71188 TDO tetramer dioxygenates L-Trp to NFK
R-HSA-71240 Tryptophan catabolism
R-HSA-6788656 Histidine, lysine, phenylalanine, tyrosine, proline and tryptophan catabolism
R-HSA-71291 Metabolism of nitrogenous molecules
R-HSA-1430728 Metabolism

-  Other Names for This Gene
  Alternate Gene Symbols: A8K053, NM_005651, NP_005642, P48775, T23O_HUMAN, TDO, uc003ipf.1
UCSC ID: uc003ipf.2
RefSeq Accession: NM_005651
Protein: P48775 (aka T23O_HUMAN)
CCDS: CCDS34086.1

-  Gene Model Information
 
category: coding nonsense-mediated-decay: no RNA accession: NM_005651.3
exon count: 12CDS single in 3' UTR: no RNA size: 1703
ORF size: 1221CDS single in intron: no Alignment % ID: 100.00
txCdsPredict score: 2446.00frame shift in genome: no % Coverage: 100.00
has start codon: yes stop codon in genome: no # of Alignments: 1
has end codon: yes retained intron: no # AT/AC introns 0
selenocysteine: no end bleed into intron: 0# strange splices: 0
Click here for a detailed description of the fields of the table above.

-  Methods, Credits, and Use Restrictions
  Click here for details on how this gene model was made and data restrictions if any.