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Symbol SLC9A1 contributors: mct/ - updated : 01-02-2013
HGNC name solute carrier family 9 (sodium/hydrogen exchanger), member 1
HGNC id 11071
Corresponding disease
SCAR19 spinocerebellar ataxia, autosomal recessive 19
Location 1p36.11      Physical location : 27.425.300 - 27.481.451
Synonym name
  • solute carrier family 9 (sodium/hydrogen exchanger), isoform 1 (antiporter, Na+/H+, amiloride sensitive)
  • antiporter (exchanger),Na+/H+
  • Na+/H+ antiporter, amiloride-sensitive
  • Na-Li countertransporter
  • Na(+)/H(+) exchanger isoform 1
  • Synonym symbol(s) APNH, APNH1, ASA, NHE1, FLJ42224, NHE-1, NHE
    TYPE functioning gene
    STRUCTURE 56.15 kb     12 Exon(s)
    Genomic sequence alignment details
    10 Kb 5' upstream gene genomic sequence study
    MAPPING cloned Y linked N status confirmed
    Physical map
    DKFZP434L0117 1p35.3 hypothetical protein DKFZp434L0117 MRPS6P1 1p35 mitochondrial ribosomal protein S6 pseudogene 1 SH3BGRL3 1p35-p34.3 SH3 domain binding glutamic acid-rich protein like 3 SOC 1p35.3 SH3 domain binding glutamic acid-rich protein like 3 CDW52 1p36 CDW52 antigen (CAMPATH-1 antigen) AIM1L 1p35.3 absent in melanoma 1-like MGC33414 1p35.3 hypothetical protein MGC33414 LIN28 1p35.3 lin-28 homolog (C. elegans) DHDDS 1p35.3 dehydrodolichyl diphosphate synthase HMGN2 1p36.1 high-mobility group nucleosomal binding domain 2 RPS6KA1 1p36-p35 ribosomal protein S6 kinase, 90kDa, polypeptide 1 SMARCF1 1p36.1-p35 SWI/SNF related, matrix associated, actin dependent regulator of chromatin, subfamily f, member 1 FLJ20477 1p35.3 hypothetical protein FLJ20477 ZDHHC18 1p35.3 zinc finger, DHHC domain containing 18 SFN 1p35.3 stratifin FLJ10349 1p35.3 hypothetical protein FLJ10349 FLJ12455 1p35.3-p35.1 hypothetical protein FLJ12455 NR0B2 1p36.1 nuclear receptor subfamily 0, group B, member 2 NUDC 1p35-p34 nuclear distribution gene C homolog (A. nidulans) FLJ34633 1p35.3 hypothetical protein FLJ34633 LOC391022 1 similar to DC2 protein LOC388610 1 LOC388610 MGC16491 1p35.3 hypothetical protein MGC16491 SLC9A1 1p35 solute carrier family 9 (sodium/hydrogen exchanger), isoform 1 (antiporter, Na+/H+, amiloride sensitive) LOC391023 1 similar to ribosomal protein L18a; 60S ribosomal protein L18a LOC284609 1p35.3 similar to hypothetical protein FLJ20420 LOC148356 1p35.3 similar to nucleophosmin 1; nucleolar phosphoprotein B23; numatrin; nucleophosmin/nucleoplasmin family, member 1 WDTC1 1p35.3 WD and tetratricopeptide repeats 1 DKFZP564D0478 1p35.3 hypothetical protein DKFZp564D0478 JFC1 1p35.3 hypothetical protein DKFZp564D0478 MAP3K6 1p35.2 mitogen-activated protein kinase kinase kinase 6 FCN3 1p36-p32 ficolin (collagen/fibrinogen domain containing) 3 (Hakata antigen) LOC388611 1 similar to EAPG6122 GPR3 1p35.1-p34.3 G protein-coupled receptor 3 WASF2 1p36.11-p34.3 WAS protein family, member 2 DJ159A19.3 1p36.13 hypothetical protein DJ159A19.3 LOC388612 1 LOC388612 FGR 1p35 Gardner-Rasheed feline sarcoma viral (v-fgr) oncogene homolog G1P3 1p35 interferon, alpha-inducible protein (clone IFI-6-16) LOC339409 1p35.3 similar to Procollagen (type III) N-endopeptidase MGC34648 1p35.3 hypothetical protein MGC34648 STX12 1p35-p34.1 syntaxin 12 PPP1R8 1p35 protein phosphatase 1, regulatory (inhibitor) subunit 8 C1orf38 1p35.2 chromosome 1 open reading frame 38 RPA2 1p35 replication protein A2, 32kDa
    TRANSCRIPTS type messenger
    identificationnb exonstypebpproduct
    ProteinkDaAAspecific expressionYearPubmed
    12 - 4587 100 815 - 2007 17662110
    addressed to the plasma membrane (PMID: 17339404)
    - - - 65 - in all cell types of the endocrine pancreas and in the adrenal medulla 2007 17339404
    addressed to the membrane of secretory granules
    Type ubiquitous
       expressed in (based on citations)
    SystemOrgan level 1Organ level 2Organ level 3Organ level 4LevelPubmedSpeciesStageRna symbol
    Digestiveesophagus   highly
     mouthtongue  highly
    Endocrineparathyroid   highly
     thyroid   highly
    SystemCellPubmedSpeciesStageRna symbol
    Skeletonosteoblast Homo sapiens
    cell lineage
    cell lines squamous cell carcinoma
    at STAGE
  • a large 500 AAs N-terminal membrane domain that mediates transport and consists of 12 transmembrane segments and several membrane-associated segments
  • TM IX composed of residues 339-363 is critical with pore-lining residues and a kink at the functionally important residue Ser351
  • a large acidic cytoplasmic C-terminal domain, intracellular regulatory domain, with a C-terminal intracellular tail intrinsically disordered, and SLC9A1 normal function depends on a protein recognition element within this region that may be linked to SLC9A1 trafficking via an acidic ER export motif
  • extracellular regions believed to contribute to cation coordination, transport and sensitivity to inhibitors (extracellular loop 2, EL2, is critical to its function)
    interspecies homolog to murine Npe1
  • monovalent cation: proton antiporter 1 (CPA1) transporter family
  • CATEGORY transport carrier
    SUBCELLULAR LOCALIZATION     plasma membrane
    intracellular,cytoplasm,organelle,endoplasmic reticulum
    text basolateral membrane
    basic FUNCTION
  • regulates intracellular pH by removing one intracellular H+ in exchange for one extracellular Na+
  • involved in intracellular pH regulation and cell volume
  • involved in regulating ion transport in several organs
  • blood-brain barrier Na/H exchanger, potentially stimulated during ischemia to participate in cerebral edema formation
  • membrane protein that regulates intracellular pH (pHi) by removing one intracellular H(+) in exchange for one extracellular Na(+)
  • with AKT1, has functions, including cell growth and survival, that might be regulated by increased H(+) efflux
  • highly regulated membrane protein that is required for pH homoeostasis in cardiomyocytes
  • responsible for regulating intracellular pH, cell volume, cell migration, and proliferation
  • contributes to the increased DNA synthesis and cell cycle progression of transformed cells by increasing intracellular pH
  • plays pivotal roles in cellular pH and volume homeostasis, and its dysfunction is implicated in several clinically important diseases
  • in mineralizing osteoblasts, slightly basic basal pHi is maintained, and external acid load is dissipated, by high-capacity Na(+) /H(+) exchange via SLC9A1 and SLC9A6
  • role for SLC9A1 in the long-term regulation of renal tubule function, suggesting that the regulatory interaction whereby SLC9A1 enhances the activity of SLC9A3 in the medullary thick ascending limb and plays a role in the chronic regulation of HCO(3)(-) absorption
  • normally quiescent Na(+)/H(+) exchanger-1 (SLC9A1) defends against proximal tubular epithelial cell (PTC)apoptosis, and is regulated by PI(4,5)P(2) binding
  • regulates intracellular pH by removing a single intracellular H(+) in exchange for one extracellular Na(+)
  • plays an important role in Ca(2+) signaling and cell proliferation in human central nervous system (CNS) pericytes
    a component
    small molecule
  • NEDD4 and ARRB1 as key regulators of SLC9A1 ubiquitylation, endocytosis, and function
  • binding of CHP stabilizes SLC9A1 and increases its plasma membrane localization by masking a SLC9A1 disposal signal
  • interaction between CHP2 and SLC9A1 (NHE1), two membrane proteins, is essential for protecting cells from serum deprivation-induced death
  • BRAF bound to the cytosolic regulatory tail of SLC9A1 (can directly bind to the C-terminal 182 AAs of SLC9A1 protein)
  • EPB41 binds directly to the SLC9A1cd (cytoplasmic domain of SLC9Q1) through the interaction of an EED motif in the EPB41 FERM (4.1/ezrin/radixin/moesin) domain
  • site-specific interactions of HSPA13 with SLC4A4 and SLC9A1 and subsequent modulation of membrane transporter expression
  • mitochondrial Na(+) influx via SLC8B1 is antagonized by Na(+) efflux, which is mediated by the mitochondrial SLC9A1
  • cell & other
    repressed by mild oxidative stress (represses promoter activity and expression via an early oxidation phase blocked by reducing agents, and a late phase requiring an iron-dependent increase in caspases 3 and 6 activities)
    Other EPB41 regulates SLC9A1 activity through a direct protein-protein interaction that can be modulated by intracellular pH and Na(+) and Ca(2+) concentrations
    corresponding disease(s) SCAR19
    Other morbid association(s)
    TypeGene ModificationChromosome rearrangementProtein expressionProtein Function
    constitutional germinal mutation      
    in slow-wawe epilepsy
    constitutional       gain of function
    is sufficient to initiate cardiac hypertrophy and heart failure mainly through activation of CaMKII-histone deacetylase pathway
    tumoral       gain of function
    promote metastasis in human mammary epithelial cells
    Variant & Polymorphism
    Candidate gene
    Therapy target