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UniProtKB/Swiss-Prot Q9Y5Z9: Variant p.Ser171Pro

UbiA prenyltransferase domain-containing protein 1
Gene: UBIAD1
Variant information

Variant position:  171
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 Serine (S) to Proline (P) at position 171 (S171P, p.Ser171Pro).
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 small size and polar (S) to medium size and hydrophobic (P)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -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

Involvement in disease:  Corneal dystrophy, Schnyder type (SCCD) [MIM:121800]: A form of stromal corneal dystrophy characterized by corneal clouding, resulting from abnormal deposition of cholesterol and phospholipids, and decreased visual acuity. Typically, ring-shaped yellow-white opacities composed of innumerable fine needle-shaped crystals form in Bowman layer and the adjacent anterior stroma of the central cornea. The crystals usually remain in the anterior third of the cornea. The corneal epithelium and endothelium as well as Descemet membrane are spared. {ECO:0000269|PubMed:17668063, ECO:0000269|PubMed:17962451, ECO:0000269|PubMed:18176953, ECO:0000269|PubMed:19429578, ECO:0000269|PubMed:19649163, ECO:0000269|PubMed:20489584, ECO:0000269|PubMed:20505825, ECO:0000269|PubMed:23169578, ECO:0000269|PubMed:23374346}. 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 SCCD.
Any additional useful information about the variant.

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



Sequence information

Variant position:  171
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  338
The length of the canonical sequence.

Location on the sequence:   YLSPLKLEHLALIYFGGLSG  S FLYTGGIGFKYVALGDLIIL
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                         Y----LSPLKLEHLALIYFGGLSGSFLYTGGIGFKYVALGDLIIL

Mouse                         Y----LSALKLEHLALIYFGGLSGSFLYTGGIGFKYVALGD

Rat                           Y----LSTLKLEHLALIYFGGLSGSFLYTGGIGFKYVALGD

Chicken                       A----VSTLKLEHLALVYFGGLSSSFLYTGGIGFKYVALGD

Xenopus tropicalis            F----ISKLKLEHLALIYFGGLSSSFLYTGGIGFKYVALGD

Zebrafish                     F----LSSLKLEHLALIYFGGLSSSFLYTGGIGLKYVALGD

Drosophila                    V----LSPAKMEHLALIYFGGLSSSFLYTGGIGFKYIALGD

Slime mold                    FRMDNIKCIVENILPLGAFGFILNISYTAAPIGLKYIGLGD

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 2 – 338 UbiA prenyltransferase domain-containing protein 1
Transmembrane 160 – 180 Helical


Literature citations

Genetic analysis of 14 families with Schnyder crystalline corneal dystrophy reveals clues to UBIAD1 protein function.
Weiss J.S.; Kruth H.S.; Kuivaniemi H.; Tromp G.; Karkera J.; Mahurkar S.; Lisch W.; Dupps W.J. Jr.; White P.S.; Winters R.S.; Kim C.; Rapuano C.J.; Sutphin J.; Reidy J.; Hu F.-R.; Lu da W.; Ebenezer N.; Nickerson M.L.;
Am. J. Med. Genet. A 146:271-283(2008)
Cited for: VARIANTS SCCD SER-102; GLY-118; PHE-121; PRO-171; ILE-175; ARG-177; ARG-186 AND GLU-236;

Surgical management and genetic analysis of a Chinese family with the S171P mutation in the UBIAD1 gene, the gene for Schnyder corneal dystrophy.
Mehta J.S.; Vithana E.N.; Venkataraman D.; Venkatraman A.; Yong V.H.; Aung T.; Tan D.T.;
Br. J. Ophthalmol. 93:926-931(2009)
Cited for: VARIANT SCCD PRO-171;

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.