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Symbol IGHMBP2 contributors: mct/npt/shn - updated : 30-12-2010
HGNC name immunoglobulin mu binding protein 2
HGNC id 5542
Corresponding disease
CMT2S Charcot-Marie Tooth disease type 2 S
SMARD1 diaphragmatic spinal muscular atrophy with respiratory distress 1
Location 11q13.3      Physical location : 68.671.318 - 68.708.069
Synonym name
  • ATP-dependent helicase IGHMBP2
  • DNA-binding protein SMUBP-2
  • GF-1
  • cardiac transcription factor 1
  • glial factor 1
  • immunoglobulin mu-binding protein 2
  • Synonym symbol(s) SMUBP2, CATF1, HCSA, SMARD1, HMN6, SMBP2, GF-1, FLJ41171, FLJ34220
    TYPE functioning gene
    STRUCTURE 36.75 kb     15 Exon(s)
    10 Kb 5' upstream gene genomic sequence study
    regulatory sequence Promoter
    text structure
  • a 108-bp region is essential for basal promoter activity
  • GGAA motifs are located upstream of the transcription start sites and duplicated GGAA motifs are essential for the IGHMBP2 promoter activity and its positive response to TPA in HL-60 cells
  • MAPPING cloned Y linked N status confirmed
    Map cen - D11S1337 - D11S4178 - IGHMBP2 - D11S4113 - D11S4095 - qter
    Physical map
    ALDH3B2 11q13 aldehyde dehydrogenase 3 family, member B2 RPL37P2 11q13 ribosomal protein L37 pseudogene 2 LOC132740 11q13.1 similar to unc-93 homolog B1; unc93 (C.elegans) homolog B; unc-93 related protein LOC390215 11 similar to seven transmembrane helix receptor OR7E11P 11q11 olfactory receptor, family 7, subfamily E, member 11 pseudogene LOC390216 11 similar to mannosyltransferase LOC158490 11q13.1 similar to hypothetical protein FLJ10661 LOC387785 11 LOC387785 LOC390217 11 similar to chromosome 11 open reading frame2; chromosome  11 open reading frame2 LOC341128 11q13.1 similar to seven transmembrane helix receptor UNC93B1 11q13 unc-93 homolog B1 (C. elegans) ALDH3B1 11q13 aldehyde dehydrogenase 3 family, member B1 NDUFS8 11q13 NADH dehydrogenase (ubiquinone) Fe-S protein 8, 23kDa (NADH-coenzyme Q reductase) TCIRG1 11q13.4-q13.5 T-cell, immune regulator 1, ATPase, H+ transporting, lysosomal V0 protein a isoform 3 CHK 11q13.1 choline kinase CGI-85 11q13 choline kinase C11orf24 11q13 chromosome 11 open reading frame 24 LRP5 11q13 low density lipoprotein receptor-related protein 5 C11orf23 11q13 chromosome 11 open reading frame 23 GAL 11q13.3-q13.5 galanin MTL5 11q13.2-q13.3 metallothionein-like 5, testis-specific (tesmin) CPT1A 11q13.1-q13.2 carnitine palmitoyltransferase 1A (liver) MRPL21 11q13.1 mitochondrial ribosomal protein L21 IGHMBP2 11q13.2-q13.4 immunoglobulin mu binding protein 2 MRGD 11 mas-related G protein-coupled MRGD MGC21621 11q13.1 G protein-coupled receptor MrgF TPCN2 11q13.1 two pore segment channel 2 LOC338694 11q13.2 hypothetical protein LOC338694 MYEOV 11q13.1 myeloma overexpressed gene (in a subset of t(11;14) positive multiple myelomas) LOC390218 11 similar to Interferon-induced transmembrane protein 3 (Interferon-inducible protein 1-8U) LOC220061 11q13.2 similar to proline rich antigen 2 CCND1 11q13.3 cyclin D1 (PRAD1: parathyroid adenomatosis 1) ORAOV1 11q13 oral cancer overexpressed 1 FGF19 11q13.1 fibroblast growth factor 19 FGF4 11q13.3 fibroblast growth factor 4 (heparin secretory transforming protein 1, Kaposi sarcoma oncogene) FGF3 11q13.3 fibroblast growth factor 3 (murine mammary tumor virus integration site (v-int-2) oncogene homolog) ORAOV2 11q13.2 oral cancer overexpressed 2
    TRANSCRIPTS type messenger
    identificationnb exonstypebpproduct
    ProteinkDaAAspecific expressionYearPubmed
    15 - 3955 - 993 highly in cell bodies, axons and growth cones of pinal motor neurons - 15269181
    Type ubiquitous
       expressed in (based on citations)
    SystemOrgan level 1Organ level 2Organ level 3Organ level 4LevelPubmedSpeciesStageRna symbol
    Lymphoid/Immunespleen   highly
     thymus   highly
    Nervousspinal cord    
    Reproductivemale systemtestis  highly
    SystemTissueTissue level 1Tissue level 2LevelPubmedSpeciesStageRna symbol
    Blood / Hematopoieticbone marrow   
    SystemCellPubmedSpeciesStageRna symbol
    cell lineage
    cell lines
    at STAGE
  • a AN1-type zinc finger
  • a R3H domain
  • helicase-like motifs
  • a DNA-binding domain with no homology to any known DNA-binding motif
  • a DNA/RNA helicase domain
  • nucleic acid-binding domains
    interspecies ortholog to Ighmbp2, Mus musculus
    ortholog to Ighmbp2, Rattus norvegicus
    ortholog to IGHMBP2, Pan troglodytes
  • helicase superfamily
  • CATEGORY immunity/defense , transcription factor
    SUBCELLULAR LOCALIZATION     intracellular
  • highly in the cytoplasm including axons and growth cones of motor neurons, lowly in the nucleus
  • localizes predominantly to the cytoplasm of neuronal and non-neuronal cells and associates with ribosomes (Guenther 2009)
  • basic FUNCTION
  • having a strong DNA-dependent ATPase activity and a possible role during S phase and in DNA synthesis (Biswas 2001)
  • stimulating the transcription of the human neurotropic virus JCV
  • role in the maintenance and survival of motor neurons and skeletal and cardiac myocytes
  • ATP-dependent 5 prime /3 prime helicase, involved in neurons, skeletal and cardiac myocytes maintenance and survival
  • an ATP-dependent 5' --> 3' helicase, which unwinds RNA and DNA duplices
  • DNA-binding protein specific to 5'-phosphorylated single-stranded guanine-rich sequence related to the
  • immunoglobulin mu chain switch region
  • may function in RNA processing, regulation or metabolism (de Planell-Saguer 2009)
  • CELLULAR PROCESS nucleotide, replication
    nucleotide, transcription
    nucleotide, RNA splicing
    a component component of the translational machinery and that these components can be manipulated genetically to suppress motor neuron degeneration
    DNA single-stranded DNA
    small molecule cofactor,
  • ATP
  • protein
    cell & other ribosomes
    corresponding disease(s) SMARD1 , CMT2S
    Other morbid association(s)
    TypeGene ModificationChromosome rearrangementProtein expressionProtein Function
    constitutional   inversion    
    genomic rearrangement in late onset SMARD1 patient
    Variant & Polymorphism
    Candidate gene
    Therapy target
  • transgenic mice expressing the full-length Ighmbp2 cDNA in myocytes have an increased lifespan up to 8-fold by preventing primary dilated cardiomyopathy and showed complete functional correction as measured by ECG, echocardiography and plasma creatine kinase-MB
  • nmd mice expressing Ighmbp2 both in myocytes and in neurons display correction of both dilated cardiomyopathy and motor neuron disease
  • recessive mutation of the Ighmbp2 gene in neuromuscular degeneration (nmd) mice causes progressive neurogenic atrophy of limb muscles and mice show significant loss of motor neurons with large caliber axons and a moderate reduction of neurons with small caliber axons in the ventral nerve roots of the spinal cord
  • Ighmbp2 protein levels are strongly reduced in neuromuscular degeneration (nmd) mice, the mouse model of SMARD1 and mutant mice show severe motor neuron degeneration
  • Mutations in Ighmbp2 gene cause motor neuron disease and dilated cardiomyopathy in the neuromuscular degeneration (nmd) mouse
  • nmd mice, an animal model of SMARD1, display down-regulation of genes involved in excitatory amino acid toxicity and oxidative stress handling, and an up-regulation of genes related to the chromatin organization