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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot Q9Y5Y0: Variant p.Asn121Asp

Choline/ethanolamine transporter FLVCR1
Gene: FLVCR1
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Variant information Variant position: help 121 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 Asparagine (N) to Aspartate (D) at position 121 (N121D, p.Asn121Asp). 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 polar (N) to medium size and acidic (D) 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 RETSNS; likely pathogenic; abolished localization to the plasma membrane, leading to decreased heme exporter activity. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 121 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 555 The length of the canonical sequence.
Location on the sequence: help TALSPRRFVVLLIFSLYSLV N AFQWIQYSIISNVFEGFYGV 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                         TALSPRRFVVLLIFSLYSLVNAFQWIQYSIISNVFEGFYGV

Mouse                         TALSPRRFVVLLIFSLYSLVNAFQWIQYSSISNVFEDFYEV

Cat                           TALSARRFVVLLIFSLYSLVNAFQWIQYSVISNVFEGFYGV
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 – 555 Choline/ethanolamine transporter FLVCR1
Transmembrane 100 – 124 Helical; Name=TM1
Alternative sequence 1 – 276 Missing. In isoform 2.
Mutagenesis 125 – 125 W -> A. Reduced transport of choline and ethanolamine.
Helix 106 – 130



Literature citations
Mutations in FLVCR1 cause posterior column ataxia and retinitis pigmentosa.
Rajadhyaksha A.M.; Elemento O.; Puffenberger E.G.; Schierberl K.C.; Xiang J.Z.; Putorti M.L.; Berciano J.; Poulin C.; Brais B.; Michaelides M.; Weleber R.G.; Higgins J.J.;
Am. J. Hum. Genet. 87:643-654(2010)
Cited for: VARIANTS RETSNS ASP-121; ARG-192 AND THR-241; Mutations of FLVCR1 in posterior column ataxia and retinitis pigmentosa result in the loss of heme export activity.
Yanatori I.; Yasui Y.; Miura K.; Kishi F.;
Blood Cells Mol. Dis. 49:60-66(2012)
Cited for: FUNCTION; SUBCELLULAR LOCATION; CHARACTERIZATION OF VARIANTS RETSNS ASP-121; ARG-192; THR-241 AND ARG-493; Clinical and imaging characteristics of posterior column ataxia with retinitis pigmentosa with a specific FLVCR1 mutation.
Lee J.; Scanga H.L.; Dansingani K.K.; Taubenslag K.J.; Zlotcavitch L.; Chauhan B.K.; Sylvester C.L.; Morton D.H.; Nischal K.K.;
Ophthalmic Genet. 39:735-740(2018)
Cited for: VARIANT RETSNS ASP-121;
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.