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TXK TXK tyrosine kinase [ Homo sapiens (human) ]

Gene ID: 7294, updated on 5-Aug-2026
Official Symbol
TXKprovided by HGNC
Official Full Name
TXK tyrosine kinaseprovided by HGNC
Primary source
HGNC:HGNC:12434
See related
Ensembl:ENSG00000074966 MIM:600058; AllianceGenome:HGNC:12434
Gene type
protein coding
RefSeq status
VALIDATED
Organism
Homo sapiens
Lineage
Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae; Homo
Also known as
RLK; TKL; BTKL; PTK4; PSCTK5
Summary
Predicted to enable non-membrane spanning protein tyrosine kinase activity. Involved in positive regulation of macromolecule biosynthetic process; positive regulation of type II interferon-mediated signaling pathway; and protein autophosphorylation. Located in cytosol; nuclear lumen; and plasma membrane. [provided by Alliance of Genome Resources, Jul 2025]
Expression
Broad expression in lymph node (RPKM 5.7), spleen (RPKM 3.3) and 15 other tissues See more
Orthologs
all
Try the new Gene page
Try the new Transcripts and proteins table
See TXK in Genome Data Viewer
Location:
4p12
Exon count:
18
Annotation release Status Assembly Chr Location
RS_2025_08 current GRCh38.p14 (GCF_000001405.40) 4 NC_000004.12 (48066393..48134250, complement)
RS_2025_08 current T2T-CHM13v2.0 (GCF_009914755.1) 4 NC_060928.1 (48033459..48101082, complement)
RS_2024_09 previous assembly GRCh37.p13 (GCF_000001405.25) 4 NC_000004.11 (48068410..48136267, complement)

Chromosome 4 - NC_000004.12Genomic Context describing neighboring genes Neighboring gene uncharacterized LOC101927157 Neighboring gene cyclic nucleotide gated channel subunit alpha 1 Neighboring gene OCT4-NANOG hESC enhancer GRCh37_chr4:48013506-48014020 Neighboring gene OCT4-NANOG hESC enhancer GRCh37_chr4:48014021-48014534 Neighboring gene H3K27ac hESC enhancer GRCh37_chr4:48018379-48018880 Neighboring gene ATAC-STARR-seq lymphoblastoid silent region 15402 Neighboring gene ATAC-STARR-seq lymphoblastoid silent region 15403 Neighboring gene ATAC-STARR-seq lymphoblastoid active region 21533 Neighboring gene ATAC-STARR-seq lymphoblastoid active region 21534 Neighboring gene ATAC-STARR-seq lymphoblastoid active region 21535 Neighboring gene NIPA like domain containing 1 Neighboring gene ATAC-STARR-seq lymphoblastoid active region 21536 Neighboring gene P300/CBP strongly-dependent group 1 enhancer GRCh37_chr4:48095793-48096992 Neighboring gene uncharacterized LOC124900886 Neighboring gene BRD4-independent group 4 enhancer GRCh37_chr4:48114113-48115312 Neighboring gene RNA, U6 small nuclear 838, pseudogene Neighboring gene OCT4-NANOG-H3K27ac hESC enhancer GRCh37_chr4:48129156-48130018 Neighboring gene ATAC-STARR-seq lymphoblastoid active region 21537 Neighboring gene Sharpr-MPRA regulatory region 15119 Neighboring gene NANOG hESC enhancer GRCh37_chr4:48177274-48177775 Neighboring gene tec protein tyrosine kinase Neighboring gene H3K27ac-H3K4me1 hESC enhancer GRCh37_chr4:48187797-48188522 Neighboring gene ATAC-STARR-seq lymphoblastoid active region 21538 Neighboring gene ATAC-STARR-seq lymphoblastoid active region 21539 Neighboring gene ATAC-STARR-seq lymphoblastoid active region 21540 Neighboring gene ATAC-STARR-seq lymphoblastoid active region 21541 Neighboring gene ATAC-STARR-seq lymphoblastoid active region 21542 Neighboring gene ATAC-STARR-seq lymphoblastoid active region 21543 Neighboring gene ATAC-STARR-seq lymphoblastoid active region 21544 Neighboring gene ATAC-STARR-seq lymphoblastoid active region 21545 Neighboring gene ATAC-STARR-seq lymphoblastoid active region 21546 Neighboring gene ATAC-STARR-seq lymphoblastoid active region 21547 Neighboring gene ATAC-STARR-seq lymphoblastoid silent region 15404 Neighboring gene ATAC-STARR-seq lymphoblastoid silent region 15405 Neighboring gene H3K27ac hESC enhancer GRCh37_chr4:48293363-48294358 Neighboring gene TEC divergent transcript

Go to nucleotide: Graphics FASTA GenBank

  • Project title: Tissue-specific circular RNA induction during human fetal development
  • Description: 35 human fetal samples from 6 tissues (3 - 7 replicates per tissue) collected between 10 and 20 weeks gestational time were sequenced using Illumina TruSeq Stranded Total RNA
  • BioProject: PRJNA270632
  • Publication: PMID 26076956
  • Analysis date: Mon Apr 2 22:54:59 2018

Related articles in PubMed

  1. Characterization, evolution, and abiotic stress responses of leucine-rich repeat receptor-like protein kinases (LRR-RLK) in Liriodendron chinense. Mu Z, et al. BMC Genomics, 2024 Jul 31. PMID 39085785, Free PMC Article
  2. TXK, a novel human tyrosine kinase expressed in T cells shares sequence identity with Tec family kinases and maps to 4p12. Haire RN, et al. Hum Mol Genet, 1994 Jun. PMID 7951233
  3. Skewed Th1 responses caused by excessive expression of Txk, a member of the Tec family of tyrosine kinases, in patients with Behcet's disease. Suzuki N, et al. Clin Med Res, 2006 Jun. PMID 16809408, Free PMC Article
  4. A YAC contig spanning a cluster of human type III receptor protein tyrosine kinase genes (PDGFRA-KIT-KDR) in chromosome segment 4q12. Spritz RA, et al. Genomics, 1994 Jul 15. PMID 7528718
  5. Txk, a nonreceptor tyrosine kinase of the Tec family, is expressed in T helper type 1 cells and regulates interferon gamma production in human T lymphocytes. Kashiwakura J, et al. J Exp Med, 1999 Oct 18. PMID 10523612, Free PMC Article

See all (37) citations in PubMed

GeneRIFs: Gene References Into Functions

What's a GeneRIF?
  1. Characterization, evolution, and abiotic stress responses of leucine-rich repeat receptor-like protein kinases (LRR-RLK) in Liriodendron chinense.
    Title: Characterization, evolution, and abiotic stress responses of leucine-rich repeat receptor-like protein kinases (LRR-RLK) in Liriodendron chinense.
  2. These data indicate that PRN694 is a highly selective and potent covalent inhibitor of ITK and RLK, and its extended target residence time enables durable attenuation of effector cells in vitro and in vivo.
    Title: Targeting interleukin-2-inducible T-cell kinase (ITK) and resting lymphocyte kinase (RLK) using a novel covalent inhibitor PRN694.
  3. Observational study of gene-disease association, gene-environment interaction, and pharmacogenomic / toxicogenomic. (HuGE Navigator)
    Title: Variation at the NFATC2 locus increases the risk of thiazolidinedione-induced edema in the Diabetes REduction Assessment with ramipril and rosiglitazone Medication (DREAM) study.
  4. Observational study of gene-disease association. (HuGE Navigator)
    Title: Investigation of genetic susceptibility factors for human longevity - a targeted nonsynonymous SNP study.
  5. Clinical trial of gene-disease association and gene-environment interaction. (HuGE Navigator)
    Title: Personalized smoking cessation: interactions between nicotine dose, dependence and quit-success genotype score.
  6. Itk and Txk exert their effects on T helper (Th) cell differentiation and function at the level of expression; transgenic Txk is not a specific regulator of Th1 responses.
    Title: Selective expression rather than specific function of Txk and Itk regulate Th1 and Th2 responses.
  7. Th1 cells expressing Txk and Th1-associated cytokines may play a critical role in the development of skin and intestinal lesions in patients with Behcet's disease.
    Title: Skewed Th1 responses caused by excessive expression of Txk, a member of the Tec family of tyrosine kinases, in patients with Behcet's disease.
  8. fuctions as a Th1 cell-specific transcription factor and regulates IFN-gamma gene transcription
    Title: Txk, a member of nonreceptor tyrosine kinase of Tec family, acts as a Th1 cell-specific transcription factor and regulates IFN-gamma gene transcription.
Submit: New GeneRIF Correction

Find tests for this gene in the NIH Genetic Testing Registry (GTR)

Review eQTL and phenotype association data in this region using PheGenI

EBI GWAS Catalog

Description
Host-microbe interactions have shaped the genetic architecture of inflammatory bowel disease.
EBI GWAS Catalog

See variants in ClinVar

See studies and variants in dbVar

See Variation Viewer (GRCh37.p13)

Products Interactant Other Gene Complex Source Pubs Description

Markers

Homology

Clone Names

  • MGC22473

Gene Ontology Provided by GOA

Function Evidence Code Pubs
enables ATP binding IEA
Inferred from Electronic Annotation
more info
  
enables non-membrane spanning protein tyrosine kinase activity IBA
Inferred from Biological aspect of Ancestor
more info
  
enables non-membrane spanning protein tyrosine kinase activity IEA
Inferred from Electronic Annotation
more info
  
enables protein binding IPI
Inferred from Physical Interaction
more info
 PubMed 
enables protein kinase activity IEA
Inferred from Electronic Annotation
more info
  
enables protein tyrosine kinase activity EXP
Inferred from Experiment
more info
 PubMed 
enables protein tyrosine kinase activity IEA
Inferred from Electronic Annotation
more info
  
Process Evidence Code Pubs
involved_in T cell receptor signaling pathway IBA
Inferred from Biological aspect of Ancestor
more info
  
involved_in T cell receptor signaling pathway IEA
Inferred from Electronic Annotation
more info
  
involved_in T cell receptor signaling pathway ISS
Inferred from Sequence or Structural Similarity
more info
  
involved_in adaptive immune response IBA
Inferred from Biological aspect of Ancestor
more info
  
involved_in adaptive immune response IEA
Inferred from Electronic Annotation
more info
  
involved_in adaptive immune response ISS
Inferred from Sequence or Structural Similarity
more info
  
involved_in positive regulation of cytokine production IEA
Inferred from Electronic Annotation
more info
  
involved_in positive regulation of cytokine production ISS
Inferred from Sequence or Structural Similarity
more info
  
involved_in positive regulation of transcription by RNA polymerase II IDA
Inferred from Direct Assay
more info
 PubMed 
involved_in positive regulation of type II interferon production IDA
Inferred from Direct Assay
more info
 PubMed 
involved_in positive regulation of type II interferon-mediated signaling pathway IDA
Inferred from Direct Assay
more info
 PubMed 
involved_in protein autophosphorylation IDA
Inferred from Direct Assay
more info
 PubMed 
involved_in protein phosphorylation IDA
Inferred from Direct Assay
more info
 PubMed 
involved_in regulation of gene expression IDA
Inferred from Direct Assay
more info
 PubMed 
Component Evidence Code Pubs
located_in cytoplasm IDA
Inferred from Direct Assay
more info
 PubMed 
located_in cytoplasm IEA
Inferred from Electronic Annotation
more info
  
located_in cytosol IDA
Inferred from Direct Assay
more info
  
located_in cytosol IEA
Inferred from Electronic Annotation
more info
  
located_in nucleolus IDA
Inferred from Direct Assay
more info
  
located_in nucleoplasm IDA
Inferred from Direct Assay
more info
  
located_in nucleus IDA
Inferred from Direct Assay
more info
 PubMed 
located_in nucleus IEA
Inferred from Electronic Annotation
more info
  
located_in plasma membrane EXP
Inferred from Experiment
more info
 PubMed 
is_active_in plasma membrane IBA
Inferred from Biological aspect of Ancestor
more info
  
located_in plasma membrane IDA
Inferred from Direct Assay
more info
  
located_in plasma membrane IEA
Inferred from Electronic Annotation
more info
  
Preferred Names
tyrosine-protein kinase TXK
Names
PTK4 protein tyrosine kinase 4
protein-tyrosine kinase 4
resting lymphocyte kinase
NP_003319.2
XP_011512049.1
XP_011512050.1
XP_016864070.1
XP_024309968.1
XP_047272078.1
XP_047272079.1
XP_047272081.1
XP_054206748.1
XP_054206749.1
XP_054206750.1
XP_054206751.1
XP_054206752.1
XP_054206753.1
XP_054206754.1

NEW Try the new Transcript table

RefSeqs maintained independently of Annotated Genomes

These reference sequences exist independently of genome builds. Explain

These reference sequences are curated independently of the genome annotation cycle, so their versions may not match the RefSeq versions in the current genome build. Identify version mismatches by comparing the version of the RefSeq in this section to the one reported in Genomic regions, transcripts, and products above.

mRNA and Protein(s)

  1. NM_003328.3 → NP_003319.2  tyrosine-protein kinase TXK

    See identical proteins and their annotated locations for NP_003319.2

    Status: VALIDATED

    Source sequence(s)
    AC096749, DB103575, L27071
    Consensus CDS
    CCDS3480.1
    UniProtKB/Swiss-Prot
    P42681, Q14220
    UniProtKB/TrEMBL
    E7EQN8
    Related
    ENSP00000264316.4, ENST00000264316.9
    Conserved Domains (3) summary
    cd05059
    Location:266 → 521
    PTKc_Tec_like; Catalytic domain of Tec-like Protein Tyrosine Kinases
    cd10398
    Location:143 → 248
    SH2_Tec_Txk; Src homology 2 (SH2) domain found in Tec protein, Txk
    cd11907
    Location:85 → 139
    SH3_TXK; Src Homology 3 domain of TXK, also called Resting lymphocyte kinase (Rlk)

RefSeqs of Annotated Genomes: GCF_000001405.40-RS_2025_08

The following sections contain reference sequences that belong to a specific genome build. Explain

Reference GRCh38.p14 Primary Assembly

Genomic

  1. NC_000004.12 Reference GRCh38.p14 Primary Assembly

    Range
    48066393..48134250 complement
    Download
    GenBank, FASTA, Sequence Viewer (Graphics)

mRNA and Protein(s)

  1. XM_017008581.3 → XP_016864070.1  tyrosine-protein kinase TXK isoform X3

    UniProtKB/TrEMBL
    E7EQN8

  2. XM_011513747.4 → XP_011512049.1  tyrosine-protein kinase TXK isoform X2

    UniProtKB/TrEMBL
    E7EQN8
    Conserved Domains (4) summary
    cd05059
    Location:247 → 502
    PTKc_Tec_like; Catalytic domain of Tec-like Protein Tyrosine Kinases
    cd10398
    Location:131 → 229
    SH2_Tec_Txk; Src homology 2 (SH2) domain found in Tec protein, Txk
    pfam07714
    Location:252 → 499
    Pkinase_Tyr; Protein tyrosine kinase
    cl17036
    Location:88 → 130
    SH3; Src Homology 3 domain superfamily

  3. XM_024454200.2 → XP_024309968.1  tyrosine-protein kinase TXK isoform X1

    UniProtKB/TrEMBL
    E7EQN8
    Conserved Domains (3) summary
    cd05059
    Location:269 → 524
    PTKc_Tec_like; Catalytic domain of Tec-like Protein Tyrosine Kinases
    cd10398
    Location:146 → 251
    SH2_Tec_Txk; Src homology 2 (SH2) domain found in Tec protein, Txk
    cd11907
    Location:88 → 142
    SH3_TXK; Src Homology 3 domain of TXK, also called Resting lymphocyte kinase (Rlk)

  4. XM_047416123.1 → XP_047272079.1  tyrosine-protein kinase TXK isoform X5

  5. XM_011513748.4 → XP_011512050.1  tyrosine-protein kinase TXK isoform X6

    Conserved Domains (2) summary
    pfam07714
    Location:33 → 280
    Pkinase_Tyr; Protein tyrosine kinase
    cl21453
    Location:28 → 287
    PKc_like; Protein Kinases, catalytic domain

  6. XM_047416122.1 → XP_047272078.1  tyrosine-protein kinase TXK isoform X4

  7. XM_047416125.1 → XP_047272081.1  tyrosine-protein kinase TXK isoform X7

    Related
    ENSP00000796427.1, ENST00001126622.1

RNA

  1. XR_007057955.1 RNA Sequence

Alternate T2T-CHM13v2.0

Genomic

  1. NC_060928.1 Alternate T2T-CHM13v2.0

    Range
    48033459..48101082 complement
    Download
    GenBank, FASTA, Sequence Viewer (Graphics)

mRNA and Protein(s)

  1. XM_054350775.1 → XP_054206750.1  tyrosine-protein kinase TXK isoform X3

    UniProtKB/TrEMBL
    E7EQN8

  2. XM_054350774.1 → XP_054206749.1  tyrosine-protein kinase TXK isoform X2

    UniProtKB/TrEMBL
    E7EQN8

  3. XM_054350773.1 → XP_054206748.1  tyrosine-protein kinase TXK isoform X1

    UniProtKB/TrEMBL
    E7EQN8

  4. XM_054350777.1 → XP_054206752.1  tyrosine-protein kinase TXK isoform X5

  5. XM_054350778.1 → XP_054206753.1  tyrosine-protein kinase TXK isoform X6

  6. XM_054350776.1 → XP_054206751.1  tyrosine-protein kinase TXK isoform X4

  7. XM_054350779.1 → XP_054206754.1  tyrosine-protein kinase TXK isoform X7

RNA

  1. XR_008487028.1 RNA Sequence

Nucleotide Protein
Heading Accession and Version
Protein Accession Links
GenPept Link UniProtKB Link
P42681.3 GenPept UniProtKB/Swiss-Prot:P42681

Gene LinkOut

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