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MUC16 (mucin 16, cell surface associated)

Written2007-10Shantibhusan Senapati, Moorthy P Ponnusamy, Ajay P Singh, Maneesh Jain, Surinder K Batra
Department of Biochemistry, Molecular Biology, University of Nebraska Medical Center, 985870 Nebraska Medical Center, Durham Research center 7005, Omaha, NE 68198-5870, USA (SKB)

(Note : for Links provided by Atlas : click)


Alias (NCBI)CA125
HGNC (Hugo) MUC16
HGNC Alias symbCA125
LocusID (NCBI) 94025
Atlas_Id 41455
Location 19p13.2  [Link to chromosome band 19p13]
Location_base_pair Starts at 8848844 and ends at 8981342 bp from pter ( according to hg19-Feb_2009)  [Mapping MUC16.png]
Fusion genes
(updated 2017)
Data from Atlas, Mitelman, Cosmic Fusion, Fusion Cancer, TCGA fusion databases with official HUGO symbols (see references in chromosomal bands)
MUC16 (19p13.2) / DNAJC22 (12q13.12)MUC16 (19p13.2) / HLA-B (6p21.33)MUC16 (19p13.2) / MUC16 (19p13.2)
MUC16 (19p13.2) / SCUBE3 (6p21.31)
Note MUC16 belongs to the subgroup of the membrane-anchored mucin. It is a type-1 glycopotein with heavy O- and N-type glycosylation.


  Shows the genomic organization of MUC16 gene.
Description In the genome, MUC16 is localized in 19p13.2 chromosome and is coded by sequences present within approximatively 179kb of genomic DNA.
Transcription As per the present available information, there is a discrepancy regarding the total number of exons present in MUC16 genomic DNA. This discrepancy is due to the absence/presence of some of the genomic sequences (particularly for the repeat regions) in the available genomic databases. The terminal nine exons on both 5' and 3' ends code for the amino- and carboxy-terminal domains of MUC16, respectively. At the same time, it has been proposed that five consecutive exons code for a single repeat unit (SRU) of the central tandem repeat domain.


  Shows the structural organization of CA125/MUC16 protein.
Description MUC16 protein harbors a central tandem repeat region, N-terminal domain and carboxy terminal domain. The N-terminal domain has 12070 numbers of amino acids rich in serine/threonine residues and accounts for the major O-glycosylation known to be present in CA125. The MUC16 protein back bone is dominated by tandem repeat region, which has more than 60 repeat domains, each composed of 156 amino acids. Though all the individual repeat units are not similar, most of them occur more than once in the sequence.
The repeat units are rich in serine, threonine and proline residues, which are typical for any mucins. Each repeat unit has some homology to the SEA (Sea-urchin sperm protein, Enterokinase and Agrin) module, whose exact biological function is not known.
The epitopes for known anti-CA125 antibodies (OC125 and M11) are thought to be present on a small cysteine ring region present in the tandem-repeat region of MUC16.
The carboxy-terminal domain has 284 aminoacids and can be divided into three different regions: extra cellular, transmembrane and cytoplasmic tail. The extracellular part of the carboxy-terminal domain has many N-glycosylation sites and some O-glycosyaltion sites. Several in silico analyses suggest a putative cleavage site in the extracellular part of carboxy-terminal domain. The MUC16 cytoplasmic tail is 31 amino acids long and has many possible phosphorylation sites.
The phosphorylation of CA125 in WISH cells has been reported by labeling with 32PO43- and immunoprecipitaion analysis but the exact site of phosphorylation is yet to be mapped. Interestingly, CA125 contains a putative tyrosine phosphorylation site (RRKKEGY), which was first recognized in Src family protein. This sequence is conserved in the translated mouse EST (AK003577) that has homology with CA125/MUC16 at the C-terminal end. Recently, it has been shown that MUC16 cytoplasmic tail, which contains a polybasic aminoacid sequence, interacts with cytoskeleton through ERM (ezrin/radixin/moesin) actin-binding proteins.
Expression The expression of MUC16 has been reported in human epithelia of conjunctiva, cornea, middle ear and trachea under normal physiological conditions. MUC16 is also expressed in ovarian carcinoma.
Localisation It is a type I membrane-bound protein and due to cleavage gets secreted into the extracellular space. On the ocular surface, MUC16 is expressed on the tips of the microplicae of the ocular surface.
Function MUC16 provides a disadhesive protective barrier to the ocular epithelial surface. Overexpression of CA125/MUC16 in ovarian cancer indicates its possible role in cancer pathogenesis. Studies have shown that CA125/MUC16 binds to mesothelin and galectin-1, which are overexpressed in ovarian cancer. It has also been shown that mesothelin-MUC16 interaction has significance in adhesion of ovarian cancer cells to mesothelial cells present on the inner wall of the peritoneum and on the surface of other abdominal organs. This cell to cell adhesion may help in ovarian cancer metastasis. It has been proposed that galectin-1 bound to MUC16 may cause apoptosis of T cells, and thus help in the suppression of the host immunity.
Homology Similar to mucin 16 of Pan troglodytes, Canis lupus familiaris, Mus musculus, Rattus norvegicus and Gallus gallus.

Implicated in

Entity Ovarian cancer
Disease Epithelial ovarian cancer is the most lethal gynaecologic malignancy in the United States and other parts of the world. In the United States, ovarian cancer accounts for approximately 22,000 new cases and 16,000 deaths occurring every year. The epithelial ovarian carcinomas represent approximately 90% of all types of ovarian malignant neoplasms. Due to lack of specific signs and symptoms of this disease, coupled with lack of reliable screening strategies most patients are diagnosed in the advanced stage of the disease, resulting in low overall cure rates. Ovarian cancer patients are generally treated with surgical resection and subsequent platinum-based chemotherapy. Although, many patients initially respond well to chemotherapy, long term survival remains poor due to eventual tumor recurrence and emergence of drug-resistant disease. Overall, the five year survival rate is 45%.
Prognosis Since the last 20 years, CA125/MUC16 has been used as a well-established marker for diagnosis of ovarian cancer. It is mostly overexpressed in serous type of ovarian cancers and less likely to be expressed in mucinous tumors. More than 80% of ovarian cancer patients have elevated CA125 level during their treatment period. It has been shown that the disease progression is associated with an increase in serum CA125 level, while a decline in serum CA125 level is associated with response to therapy. In another finding, it has been shown that the trend of serum CA125 level during the first three courses of chemotherapy is a strong forecaster of re-examination findings in patients with ovarian carcinoma at the end of treatment. Interestingly, it has been shown that a normal CA125 level by the end of second or third chemotherapy is strongly linked to the survival of patients in stage 3 or stage 4 conditions. Also, variations in the CA125 value even within the normal range carry useful information regarding prediction of time to treatment failure. Additionally, in patients in stage 1 cancers it has been suggested that CA125 elevations are not related to the tumor mass volume. Recently, the potential of CA125/MUC16 as a therapeutic target has been harnessed by using an armed human antibody (3A5) against MUC16 protein.
Oncogenesis There is no experimental evidence in the scientific literature for a role of MUC16 in oncogenesis. However, MUC16 possesses many structural similarities with other membrane bound mucins, like MUC1 and MUC4, which are already shown to be functionally involved in different cancers. Transmembrane mucins are hypothesized to serve as sensors of the external environment and can transduce signals via the post-translational modifications of their cytoplasmic tail. Phosphorylation of MUC16 protein has already been reported. Though the exact interacting partner and the site of phosphorylation are unknown, the presence of potential phosphorylation sites in MUC16 cytoplasmic tail indicates the possible role of MUC16 in downstream signal transduction. Further, it has been shown that MUC16 interacts with galectin-1 and mesothelin and these interactions may have a role in cancer progression.


Functions of MUC16 in corneal epithelial cells.
Blalock TD, Spurr-Michaud SJ, Tisdale AS, Heimer SR, Gilmore MS, Ramesh V, Gipson IK
Investigative ophthalmology & visual science. 2007 ; 48 (10) : 4509-4518.
PMID 17898272
Aberrant expression of MUC4 in ovarian carcinoma: diagnostic significance alone and in combination with MUC1 and MUC16 (CA125).
Chauhan SC, Singh AP, Ruiz F, Johansson SL, Jain M, Smith LM, Moniaux N, Batra SK
Modern pathology : an official journal of the United States and Canadian Academy of Pathology, Inc. 2006 ; 19 (10) : 1386-1394.
PMID 16880776
Armed antibodies targeting the mucin repeats of the ovarian cancer antigen, MUC16, are highly efficacious in animal tumor models.
Chen Y, Clark S, Wong T, Chen Y, Chen Y, Dennis MS, Luis E, Zhong F, Bheddah S, Koeppen H, Gogineni A, Ross S, Polakis P, Mallet W
Cancer research. 2007 ; 67 (10) : 4924-4932.
PMID 17510422
Methylation mediated silencing of TMS1/ASC gene in prostate cancer.
Das PM, Ramachandran K, Vanwert J, Ferdinand L, Gopisetty G, Reis IM, Singal R
Molecular cancer. 2006 ; 5 : page 28.
PMID 16848908
MUC16 is produced in tracheal surface epithelium and submucosal glands and is present in secretions from normal human airway and cultured bronchial epithelial cells.
Davies JR, Kirkham S, Svitacheva N, Thornton DJ, Carlstedt I
The international journal of biochemistry & cell biology. 2007 ; 39 (10) : 1943-1954.
PMID 17604678
Distinct evolution of the human carcinoma-associated transmembrane mucins, MUC1, MUC4 AND MUC16.
Duraisamy S, Ramasamy S, Kharbanda S, Kufe D
Gene. 2006 ; 373 : 28-34.
PMID 16500040
Solution structure of the SEA domain from the murine homologue of ovarian cancer antigen CA125 (MUC16).
Maeda T, Inoue M, Koshiba S, Yabuki T, Aoki M, Nunokawa E, Seki E, Matsuda T, Motoda Y, Kobayashi A, Hiroyasu F, Shirouzu M, Terada T, Hayami N, Ishizuka Y, Shinya N, Tatsuguchi A, Yoshida M, Hirota H, Matsuo Y, Tani K, Arakawa T, Carninci P, Kawai J, Hayashizaki Y, Kigawa T, Yokoyama S
The Journal of biological chemistry. 2004 ; 279 (13) : 13174-13182.
PMID 14764598
The CA 125 gene: a newly discovered extension of the glycosylated N-terminal domain doubles the size of this extracellular superstructure.
O'Brien TJ, Beard JB, Underwood LJ, Shigemasa K
Tumour biology : the journal of the International Society for Oncodevelopmental Biology and Medicine. 2002 ; 23 (3) : 154-169.
PMID 12218296
The cancer antigen CA125 represents a novel counter receptor for galectin-1.
Seelenmeyer C, Wegehingel S, Lechner J, Nickel W
Journal of cell science. 2003 ; 116 (Pt 7) : 1305-1318.
PMID 12615972
Ovarian cancer antigen CA125 is encoded by the MUC16 mucin gene.
Yin BW, Dnistrian A, Lloyd KO
International journal of cancer. Journal international du cancer. 2002 ; 98 (5) : 737-740.
PMID 11920644
Molecular cloning of the CA125 ovarian cancer antigen: identification as a new mucin, MUC16.
Yin BW, Lloyd KO
The Journal of biological chemistry. 2001 ; 276 (29) : 27371-27375.
PMID 11369781


This paper should be referenced as such :
Senapati, S ; Ponnusamy, MP ; Singh, AP ; Jain, M ; Batra, SK
MUC16 (mucin 16, cell surface associated)
Atlas Genet Cytogenet Oncol Haematol. 2008;12(3):223-225.
Free journal version : [ pdf ]   [ DOI ]

Other Solid tumors implicated (Data extracted from papers in the Atlas) [ 1 ]
  Fallopian tube tumors: an overview

External links

HGNC (Hugo)MUC16   15582
Entrez_Gene (NCBI)MUC16  94025  mucin 16, cell surface associated
GeneCards (Weizmann)MUC16
Ensembl hg19 (Hinxton)ENSG00000181143 [Gene_View]
Ensembl hg38 (Hinxton)ENSG00000181143 [Gene_View]  ENSG00000181143 [Sequence]  chr19:8848844-8981342 [Contig_View]  MUC16 [Vega]
ICGC DataPortalENSG00000181143
TCGA cBioPortalMUC16
AceView (NCBI)MUC16
Genatlas (Paris)MUC16
SOURCE (Princeton)MUC16
Genetics Home Reference (NIH)MUC16
Genomic and cartography
GoldenPath hg38 (UCSC)MUC16  -     chr19:8848844-8981342 -  19p13.2   [Description]    (hg38-Dec_2013)
GoldenPath hg19 (UCSC)MUC16  -     19p13.2   [Description]    (hg19-Feb_2009)
GoldenPathMUC16 - 19p13.2 [CytoView hg19]  MUC16 - 19p13.2 [CytoView hg38]
genome Data Viewer NCBIMUC16 [Mapview hg19]  
Gene and transcription
Genbank (Entrez)AF361486 AF414442 AK024365 AK056791 AK128681
RefSeq transcript (Entrez)NM_024690
RefSeq genomic (Entrez)
Consensus coding sequences : CCDS (NCBI)MUC16
Alternative Splicing GalleryENSG00000181143
Gene ExpressionMUC16 [ NCBI-GEO ]   MUC16 [ EBI - ARRAY_EXPRESS ]   MUC16 [ SEEK ]   MUC16 [ MEM ]
Gene Expression Viewer (FireBrowse)MUC16 [ Firebrowse - Broad ]
GenevisibleExpression of MUC16 in : [tissues]  [cell-lines]  [cancer]  [perturbations]  
BioGPS (Tissue expression)94025
GTEX Portal (Tissue expression)MUC16
Human Protein AtlasENSG00000181143-MUC16 [pathology]   [cell]   [tissue]
Protein : pattern, domain, 3D structure
UniProt/SwissProtQ8WXI7   [function]  [subcellular_location]  [family_and_domains]  [pathology_and_biotech]  [ptm_processing]  [expression]  [interaction]
NextProtQ8WXI7  [Sequence]  [Exons]  [Medical]  [Publications]
With graphics : InterProQ8WXI7
Splice isoforms : SwissVarQ8WXI7
Domaine pattern : Prosite (Expaxy)SEA (PS50024)   
Domains : Interpro (EBI)MUC16    SEA_dom    SEA_dom_sf   
Domain families : Pfam (Sanger)SEA (PF01390)   
Domain families : Pfam (NCBI)pfam01390   
Domain families : Smart (EMBL)SEA (SM00200)  
Conserved Domain (NCBI)MUC16
DMDM Disease mutations94025
Blocks (Seattle)MUC16
Human Protein Atlas [tissue]ENSG00000181143-MUC16 [tissue]
Peptide AtlasQ8WXI7
IPIIPI00103552   IPI00876952   IPI01009414   IPI00943307   IPI01015973   IPI01018787   
Protein Interaction databases
IntAct (EBI)Q8WXI7
Ontologies - Pathways
Ontology : AmiGOstimulatory C-type lectin receptor signaling pathway  protein binding  Golgi lumen  plasma membrane  cell adhesion  integral component of membrane  O-glycan processing  extrinsic component of membrane  vesicle  extracellular exosome  
Ontology : EGO-EBIstimulatory C-type lectin receptor signaling pathway  protein binding  Golgi lumen  plasma membrane  cell adhesion  integral component of membrane  O-glycan processing  extrinsic component of membrane  vesicle  extracellular exosome  
NDEx NetworkMUC16
Atlas of Cancer Signalling NetworkMUC16
Wikipedia pathwaysMUC16
Orthology - Evolution
GeneTree (enSembl)ENSG00000181143
Phylogenetic Trees/Animal Genes : TreeFamMUC16
Homologs : HomoloGeneMUC16
Homology/Alignments : Family Browser (UCSC)MUC16
Gene fusions - Rearrangements
Fusion Cancer (Beijing)MUC16 [19p13.2]  -  HLA-B [6p21.33]  [FUSC002548]
Fusion : Fusion_HubGRK5--MUC16    HLA-C--MUC16    HLA-E--MUC16    MUC16--DDOST    MUC16--DNAJC22    MUC16--HLA-B    MUC16--HLA-C    MUC16--IMPDH1    MUC16--MUC16    MUC16--MUC5AC    MUC16--SCUBE3    MUC16--SPACA1    MUC16--TTN   
Fusion : QuiverMUC16
Polymorphisms : SNP and Copy number variants
NCBI Variation ViewerMUC16 [hg38]
dbSNP Single Nucleotide Polymorphism (NCBI)MUC16
Exome Variant ServerMUC16
GNOMAD BrowserENSG00000181143
Varsome BrowserMUC16
Genetic variants : HAPMAP94025
Genomic Variants (DGV)MUC16 [DGVbeta]
DECIPHERMUC16 [patients]   [syndromes]   [variants]   [genes]  
CONAN: Copy Number AnalysisMUC16 
ICGC Data PortalMUC16 
TCGA Data PortalMUC16 
Broad Tumor PortalMUC16
OASIS PortalMUC16 [ Somatic mutations - Copy number]
Somatic Mutations in Cancer : COSMICMUC16  [overview]  [genome browser]  [tissue]  [distribution]  
Somatic Mutations in Cancer : COSMIC3DMUC16
Mutations and Diseases : HGMDMUC16
LOVD (Leiden Open Variation Database)Whole genome datasets
LOVD (Leiden Open Variation Database)LOVD - Leiden Open Variation Database
LOVD (Leiden Open Variation Database)LOVD 3.0 shared installation
BioMutasearch MUC16
DgiDB (Drug Gene Interaction Database)MUC16
DoCM (Curated mutations)MUC16 (select the gene name)
CIViC (Clinical Interpretations of Variants in Cancer)MUC16 (select a term)
NCG6 (London) select MUC16
Cancer3DMUC16(select the gene name)
Impact of mutations[PolyPhen2] [Provean] [Buck Institute : MutDB] [Mutation Assessor] [Mutanalyser]
Genetic Testing Registry MUC16
NextProtQ8WXI7 [Medical]
Target ValidationMUC16
Huge Navigator MUC16 [HugePedia]
snp3D : Map Gene to Disease94025
BioCentury BCIQMUC16
Clinical trials, drugs, therapy
Protein Interactions : CTD94025
Pharm GKB GenePA31314
Clinical trialMUC16
canSAR (ICR)MUC16 (select the gene name)
DataMed IndexMUC16
PubMed301 Pubmed reference(s) in Entrez
GeneRIFsGene References Into Functions (Entrez)
REVIEW articlesautomatic search in PubMed
Last year publicationsautomatic search in PubMed

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indexed on : Mon Oct 12 12:47:29 CEST 2020

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