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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot Q9Y287: Variant p.Glu261Ala

Integral membrane protein 2B
Gene: ITM2B
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Variant information Variant position: help 261 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help LP/P [Disclaimer] The variants are classified into three categories: LP/P, LB/B and US.
  • LP/P: likely pathogenic or pathogenic.
  • LB/B: likely benign or benign.
  • US: uncertain significance
Residue change: help From Glutamate (E) to Alanine (A) at position 261 (E261A, p.Glu261Ala). 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: help Change from medium size and acidic (E) to small size and hydrophobic (A) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help -1 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
Variant description: help In RDGCA. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 261 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 266 The length of the canonical sequence.
Location on the sequence: help QKREASNCFAIRHFENKFAV E TLICS 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: help The multiple alignment of the region surrounding the variant against various orthologous sequences. 
Human                         QKREASNCFAIRHFENKFAVETLICS-

Chimpanzee                    QKREASNCFAIRHFENKFAVETLICS

Mouse                         QKREASNCFTIRHFENKFAVETLICS

Rat                           QKREASNCFTIRHFENKFAVETLICS

Pig                           QKREASNCATIRHFENKFAVETLICS

Bovine                        QKRSADVCVTIRHFENRFAVETLICP

Chicken                       QKREAVNCRKIRHFENRFAMETLICE
Sequence annotation in neighborhood: help 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 1 – 266 Integral membrane protein 2B
Peptide 244 – 266 Bri23 peptide
Topological domain 76 – 266 Lumenal
Disulfide bond 248 – 265 Interchain (between ADan peptide variants)



Literature citations
The familial dementia gene revisited: a missense mutation revealed by whole-exome sequencing identifies ITM2B as a candidate gene underlying a novel autosomal dominant retinal dystrophy in a large family.
Audo I.; Bujakowska K.; Orhan E.; El Shamieh S.; Sennlaub F.; Guillonneau X.; Antonio A.; Michiels C.; Lancelot M.E.; Letexier M.; Saraiva J.P.; Nguyen H.; Luu T.D.; Leveillard T.; Poch O.; Dollfus H.; Paques M.; Goureau O.; Mohand-Said S.; Bhattacharya S.S.; Sahel J.A.; Zeitz C.;
Hum. Mol. Genet. 23:491-501(2014)
Cited for: INVOLVEMENT IN RDGCA; VARIANT RDGCA ALA-261;
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.