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UniProtKB/Swiss-Prot P16422: Variant p.Cys66Tyr

Epithelial cell adhesion molecule
Gene: EPCAM
Variant information

Variant position:  66
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  Disease [Disclaimer]
The variants are classified into three categories: Disease, Polymorphism and Unclassified.
  • Disease: Variants implicated in disease according to literature reports.
  • Polymorphism: Variants not reported to be implicated in disease.
  • Unclassified: Variants with uncertain implication in disease according to literature reports. Evidence against or in favor of a pathogenic role is limited and/or conflicting.

Residue change:  From Cysteine (C) to Tyrosine (Y) at position 66 (C66Y, p.Cys66Tyr).
Indicates the amino acid change of the variant. The one-letter and three-letter codes for amino acids used in UniProtKB/Swiss-Prot are those adopted by the commission on Biochemical Nomenclature of the IUPAC-IUB.

Physico-chemical properties:  Change from medium size and polar (C) to large size and aromatic (Y)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -2
The score within a Blosum matrix for the corresponding wild-type to variant amino acid change. The log-odds score measures the logarithm for the ratio of the likelihood of two amino acids appearing by chance. The Blosum62 substitution matrix is used. This substitution matrix contains scores for all possible exchanges of one amino acid with another:
  • Lowest score: -4 (low probability of substitution).
  • Highest score: 11 (high probability of substitution).
More information can be found on the following page

Involvement in disease:  Diarrhea 5, with tufting enteropathy, congenital (DIAR5) [MIM:613217]: An intractable diarrhea of infancy characterized by villous atrophy and absence of inflammation, with intestinal epithelial cell dysplasia manifesting as focal epithelial tufts in the duodenum and jejunum. {ECO:0000269|PubMed:18572020}. Note=The disease is caused by mutations affecting the gene represented in this entry.
The name and a short description of the disease associated with the variant. For more information about the disease, the user can refer to OMIM, following the link provided after the disease acronym.

Variant description:  In DIAR5.
Any additional useful information about the variant.

Other resources:  
Links to websites of interest for the variant.



Sequence information

Variant position:  66
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  314
The length of the canonical sequence.

Location on the sequence:   CQCTSVGAQNTVICSKLAAK  C LVMKAEMNGSKLGRRAKPEG
The residue change on the sequence. Unless the variant is located at the beginning or at the end of the protein sequence, both residues upstream (20) and downstream (20) of the variant will be shown.

Residue conservation: 
The multiple alignment of the region surrounding the variant against various orthologous sequences.

Human                         CQCTSVGAQNTVICSKLAAKCLVMKAEMNGSKLGRRAKPEG

Rhesus macaque                CQCTSIGAQNTVLCSKLAAKCLVMKAEMNGSKLGRRAKPEG

Mouse                         CQCTSYGTQNTVICSKLASKCLAMKAEMTHSKSGRRIKPEG

Rat                           CQCTSYGTQNTVICSKLASKCLVMKAEMTHSKSGRRMKPEG

Pig                           CQCTSIGAQNSVICSKLASKCLVMKAEMTGSKAGRRLKPEN

Bovine                        CQCTSVGTQHSVICTKLATKCLVMKAEMNHSKSGRRGKPEG

Chicken                       CHCNSIGSSVPVNCEILTSKCLLMKAEMANTKSGRREKPKD

Sequence annotation in neighborhood:  
The regions or sites of interest surrounding the variant. In general the features listed are posttranslational modifications, binding sites, enzyme active sites, local secondary structure or other characteristics reported in the cited references. The "Sequence annotation in neighborhood" lines have a fixed format:
  • Type: the type of sequence feature.
  • Positions: endpoints of the sequence feature.
  • Description: contains additional information about the feature.

TypePositionsDescription
Chain 24 – 314 Epithelial cell adhesion molecule
Topological domain 24 – 265 Extracellular
Domain 63 – 135 Thyroglobulin type-1
Glycosylation 74 – 74 N-linked (GlcNAc...) asparagine; partial
Disulfide bond 66 – 99
Mutagenesis 74 – 74 N -> A. Changed glycosylation pattern. Complete loss of glycosylation and substantial decrease in protein expression; when associated with A-111 and A-198.
Helix 65 – 72


Literature citations

Identification of EpCAM as the gene for congenital tufting enteropathy.
Sivagnanam M.; Mueller J.L.; Lee H.; Chen Z.; Nelson S.F.; Turner D.; Zlotkin S.H.; Pencharz P.B.; Ngan B.Y.; Libiger O.; Schork N.J.; Lavine J.E.; Taylor S.; Newbury R.O.; Kolodner R.D.; Hoffman H.M.;
Gastroenterology 135:429-437(2008)
Cited for: VARIANT DIAR5 TYR-66;

Disclaimer: Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. They are not in any way intended to be used as a substitute for professional medical advice, diagnostic, treatment or care.