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IGHM immunoglobulin heavy constant mu [ Homo sapiens (human) ]

Gene ID: 3507, updated on 17-Jun-2024


Official Symbol
IGHMprovided by HGNC
Official Full Name
immunoglobulin heavy constant muprovided by HGNC
Primary source
See related
Ensembl:ENSG00000211899 IMGT/GENE-DB:IGHM; MIM:147020; AllianceGenome:HGNC:5541
Gene type
RefSeq status
Homo sapiens
Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae; Homo
Also known as
Immunoglobulins (Ig) are the antigen recognition molecules of B cells. An Ig molecule is made up of 2 identical heavy chains and 2 identical light chains (see MIM 147200) joined by disulfide bonds so that each heavy chain is linked to a light chain and the 2 heavy chains are linked together. Each Ig heavy chain has an N-terminal variable (V) region containing the antigen-binding site and a C-terminal constant (C) region, encoded by an individual C region gene, that determines the isotype of the antibody and provides effector or signaling functions. The heavy chain V region is encoded by 1 each of 3 types of genes: V genes (see MIM 147070), joining (J) genes (see MIM 147010), and diversity (D) genes (see MIM 146910). The C region genes are clustered downstream of the V region genes within the heavy chain locus on chromosome 14. The IGHM gene encodes the C region of the mu heavy chain, which defines the IgM isotype. Naive B cells express the transmembrane forms of IgM and IgD (see IGHD; MIM 1471770) on their surface. During an antibody response, activated B cells can switch to the expression of individual downstream heavy chain C region genes by a process of somatic recombination known as isotype switching. In addition, secreted Ig forms that act as antibodies can be produced by alternative RNA processing of the heavy chain C region sequences. Although the membrane forms of all Ig isotypes are monomeric, secreted IgM forms pentamers, and occasionally hexamers, in plasma (summary by Janeway et al., 2005).[supplied by OMIM, Aug 2010]
Annotation information
Annotation category: partial on reference assembly
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Genomic context

See IGHM in Genome Data Viewer
Annotation release Status Assembly Chr Location
RS_2023_10 current GRCh38.p14 (GCF_000001405.40) 14 NC_000014.9 (105851966..105856217, complement)
RS_2023_10 current T2T-CHM13v2.0 (GCF_009914755.1) 14 NC_060938.1 (100123532..100127783, complement)
105.20220307 previous assembly GRCh37.p13 (GCF_000001405.25) 14 NC_000014.8 (106318298..106322322, complement)

Chromosome 14 - NC_000014.9Genomic Context describing neighboring genes Neighboring gene immunoglobulin heavy locus Neighboring gene MPRA-validated peak2261 silencer Neighboring gene ATP6V1G1P1-IGHD intergenic CAGE-defined B cell enhancer Neighboring gene ATPase H+ transporting V1 subunit G1 pseudogene 1 Neighboring gene microRNA 4539 Neighboring gene microRNA 4507 Neighboring gene microRNA 4538 Neighboring gene immunoglobulin heavy constant delta

Genomic regions, transcripts, and products


GeneRIFs: Gene References Into Functions

What's a GeneRIF?

Pathways from PubChem


Products Interactant Other Gene Complex Source Pubs Description

General gene information


Other Names

  • constant region of heavy chain of IgM
  • immunoglobulin mu chain

Clone Names

  • FLJ00385, MGC52291, MGC104996, DKFZp686I15196, DKFZp686I15212

Gene Ontology Provided by GOA

Function Evidence Code Pubs
enables antigen binding IBA
Inferred from Biological aspect of Ancestor
more info
enables antigen binding TAS
Traceable Author Statement
more info
contributes_to immunoglobulin receptor binding IDA
Inferred from Direct Assay
more info
contributes_to peptidoglycan binding IDA
Inferred from Direct Assay
more info
contributes_to phosphatidylcholine binding IDA
Inferred from Direct Assay
more info
contributes_to single-stranded DNA binding IDA
Inferred from Direct Assay
more info

NCBI Reference Sequences (RefSeq)

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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.


  1. NG_001019.6 

    GenBank, FASTA, Sequence Viewer (Graphics)

RefSeqs of Annotated Genomes: GCF_000001405.40-RS_2023_10

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

Reference GRCh38.p14 Primary Assembly


  1. NC_000014.9 Reference GRCh38.p14 Primary Assembly

    105851966..105856217 complement
    GenBank, FASTA, Sequence Viewer (Graphics)

Reference GRCh38.p14 ALT_REF_LOCI_1


  1. NT_187600.1 Reference GRCh38.p14 ALT_REF_LOCI_1

    319735..323986 complement
    GenBank, FASTA, Sequence Viewer (Graphics)

Alternate T2T-CHM13v2.0


  1. NC_060938.1 Alternate T2T-CHM13v2.0

    100123532..100127783 complement
    GenBank, FASTA, Sequence Viewer (Graphics)