Seroatlas · Human Serome Atlas

BCAS1

Breast carcinoma-amplified sequence 1

Also known as: AIBC1, BCAS1_HUMAN, NABC1, PMES-2

Cross-references: UniProt · Ensembl · Human Protein Atlas · GeneCards · NCBI Gene

Protein identityUniProt · HPA

UniProt accession
O75363
Gene
BCAS1
Ensembl
ENSG00000064787
Chromosome
20
Canonical length
584 aa
Protein class
Predicted intracellular proteins
Subcellular location
Vesicles
Quaternary structure
Homodimer

OverviewNCBI Gene

This gene resides in a region at 20q13 which is amplified in a variety of tumor types and associated with more aggressive tumor phenotypes. Among the genes identified from this region, it was found to be highly expressed in three amplified breast cancer cell lines and in one breast tumor without amplification at 20q13.2. However, this gene is not in the common region of maximal amplification and its expression was not detected in the breast cancer cell line MCF7, in which this region is highly amplified. Although not consistently expressed, this gene is a candidate oncogene. [provided by RefSeq, Apr 2016]

Canonical amino-acid sequenceUniProt

584 residues, UniProt reviewed canonical sequence.

>O75363|BCAS1
     1  MGNQMSVPQR VEDQENEPEA ETYQDNASAL NGVPVVVSTH TVQHLEEVDL GISVKTDNVA
    61  TSSPETTEIS AVADANGKNL GKEAKPEAPA AKSRFFLMLS RPVPGRTGDQ AADSSLGSVK
   121  LDVSSNKAPA NKDPSESWTL PVAAGPGQDT DKTPGHAPAQ DKVLSAARDP TLLPPETGGA
   181  GGEAPSKPKD SSFFDKFFKL DKGQEKVPGD SQQEAKRAEH QDKVDEVPGL SGQSDDVPAG
   241  KDIVDGKEKE GQELGTADCS VPGDPEGLET AKDDSQAAAI AENNNSIMSF FKTLVSPNKA
   301  ETKKDPEDTG AEKSPTTSAD LKSDKANFTS QETQGAGKNS KGCNPSGHTQ SVTTPEPAKE
   361  GTKEKSGPTS LPLGKLFWKK SVKEDSVPTG AEENVVCESP VEIIKSKEVE SALQTVDLNE
   421  GDAAPEPTEA KLKREESKPR TSLMAFLRQM SVKGDGGITH SEEINGKDSS CQTSDSTEKT
   481  ITPPEPEPTG APQKGKEGSS KDKKSAAEMN KQKSNKQEAK EPAQCTEQAT VDTNSLQNGD
   541  KLQKRPEKRQ QSLGGFFKGL GPKRMLDAQV QTDPVSIGPV GKSK

LocalizationUniProt · AlphaFold · HPA

Whether an antibody against BCAS1 can act on the native protein depends on physical access: surface and secreted proteins are reachable by circulating antibodies, intracellular proteins usually are not.

Antibody reachability
Intracellular
Secreted
No
Transmembrane segments
0
Mean surface accessibility (rSASA)
0.72
Highest tissue expression
202 nTPM

Expression across tissuesHPA

Tissue

  • spinal cord: 202 nTPM
  • stomach: 151 nTPM
  • midbrain: 119 nTPM
  • choroid plexus: 83 nTPM
  • cerebral cortex: 81 nTPM
  • basal ganglia: 80 nTPM

Single-cell type

  • oligodendrocytes: 1,972 nCPM
  • goblet cells: 1,263 nCPM
  • foveolar cells: 1,033 nCPM
  • oligodendrocyte progenitor cells: 741 nCPM
  • prostatic glandular cells: 348 nCPM
  • prostatic club cells: 347 nCPM

Immune cell

  • T-reg: 2.7 nTPM
  • MAIT T-cell: 1.5 nTPM
  • memory B-cell: 0.7 nTPM
  • memory CD4 T-cell: 0.4 nTPM
  • neutrophil: 0.4 nTPM
  • basophil: 0.3 nTPM

Brain region

  • medulla oblongata: 1,286 nTPM
  • white matter: 1,191 nTPM
  • midbrain: 1,019 nTPM
  • pons: 999 nTPM
  • basal ganglia: 920 nTPM
  • spinal cord: 838 nTPM

Genetic constraint and essentialitygnomAD · DepMap

Does the body need this protein intact? Low LOEUF or a strong DepMap dependency means loss or blockade of the protein is likely to be felt.

gnomAD LOEUF (loss-of-function intolerance)
0.86
gnomAD pLI
0
gnomAD missense Z
-0.25
DepMap mean gene effect
0.01
DepMap dependency class
selective

Cancer expressionTCGA

Across TCGA tumor cohorts, this protein is over-expressed in roughly 4% of surveyed tumor types (aggregate summary; per-cohort expression, alteration, and survival load in the interactive view).

OntologyGO

Biological processes

Cellular components

Protein domainsUniProt · Pfam · InterPro

  • Novel Amplified in Breast Cancer-1

KeywordsUniProt

InteractionsUniProt · HPA

Protein binding partners of BCAS1 in the human serome: UniProt-annotated complex subunits plus reported interactors. Each links to its own Seroatlas record.

Antibody and autoantibody relevanceSeroatlas analysis

Seroatlas reads BCAS1 as an antibody target. Whether an autoantibody or antibody against BCAS1 could matter depends on whether native BCAS1 is physically reachable, whether the body needs it intact, and whether it acts in a disease-relevant tissue.

BCAS1 is annotated as predominantly intracellular. Intracellular proteins are common autoantibody markers, becoming visible to the immune system after cell injury or altered processing, but are usually markers of disease rather than direct drivers.

Annotation status

The present source text does not explicitly label BCAS1 as an autoantigen. Seroatlas presents hypothesis context only and does not manufacture a known-serology claim.

Canonical record: https://seroatlas.com/gene/BCAS1. Study-independent annotations aggregated from UniProt, Human Protein Atlas, PubMed, IEDB, Pfam, InterPro, Gene Ontology, AlphaFold, gnomAD, DepMap, ClinVar, TCGA. Catalog release seroatlas-reviewed-human-uniprot-20260313.

Seroatlas is the reference for exploring autoantibody and antibody serology at the human-protein level: the autoreactome and human serome, multiplex serology (HuProt, HuScan, VirScan, PhIP-Seq).

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