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UniProtKB/Swiss-Prot P82279: Variant p.Pro836Thr

Protein crumbs homolog 1
Gene: CRB1
Chromosomal location: 1q31-q32.1
Variant information

Variant position:  836
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 Proline (P) to Threonine (T) at position 836 (P836T, p.Pro836Thr).
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 hydrophobic (P) to medium size and polar (T)
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:  Retinitis pigmentosa 12 (RP12) [MIM:600105]: A retinal dystrophy belonging to the group of pigmentary retinopathies. Retinitis pigmentosa is characterized by retinal pigment deposits visible on fundus examination and primary loss of rod photoreceptor cells followed by secondary loss of cone photoreceptors. Patients typically have night vision blindness and loss of midperipheral visual field. As their condition progresses, they lose their far peripheral visual field and eventually central vision as well. RP12 is an autosomal recessive, severe form often manifesting in early childhood. Patients experiment progressive visual field loss with severe visual impairment before the age of twenty. Some patients have a preserved paraarteriolar retinal pigment epithelium (PPRPE) and hypermetropia. {ECO:0000269|PubMed:10508521, ECO:0000269|PubMed:11389483, ECO:0000269|PubMed:11559858, ECO:0000269|PubMed:12573663, ECO:0000269|PubMed:12843338, ECO:0000269|PubMed:15459956, ECO:0000269|PubMed:19140180, ECO:0000269|PubMed:19956407, ECO:0000269|PubMed:20591486, ECO:0000269|PubMed:20956273, ECO:0000269|PubMed:21987686, ECO:0000269|PubMed:22065545, ECO:0000269|PubMed:22128245, ECO:0000269|PubMed:22334370}. 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 RP12.
Any additional useful information about the variant.

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



Sequence information

Variant position:  836
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  1406
The length of the canonical sequence.

Location on the sequence:   FISASTWKIEKGDVIYIGGL  P DKQETELNGGFFKGCIQDVR
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                         FISASTWKIEKGDVIYIGGLPDKQETELNGGFFKGCIQDVR

Mouse                         FISVPTWTIRRGDVIFIGGLPDREKTEVYGGFFKGCVQDVR

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 26 – 1406 Protein crumbs homolog 1
Topological domain 26 – 1347 Extracellular
Domain 714 – 885 Laminin G-like 2
Alternative sequence 710 – 1245 Missing. In isoform 5.


Literature citations

CRB1 mutation spectrum in inherited retinal dystrophies.
den Hollander A.I.; Davis J.; van der Velde-Visser S.D.; Zonneveld M.N.; Pierrottet C.O.; Koenekoop R.K.; Kellner U.; van den Born L.I.; Heckenlively J.R.; Hoyng C.B.; Handford P.A.; Roepman R.; Cremers F.P.M.;
Hum. Mutat. 24:355-369(2004)
Cited for: VARIANTS RP12 PHE-195; GLU-578; TYR-587; MET-745; CYS-764; THR-836; SER-850; TYR-948; SER-959; ILE-986; THR-1100 AND HIS-1383; VARIANT LCA8 THR-205; VARIANT GLN-905;

Phenotypic variability in patients with retinal dystrophies due to mutations in CRB1.
Henderson R.H.; Mackay D.S.; Li Z.; Moradi P.; Sergouniotis P.; Russell-Eggitt I.; Thompson D.A.; Robson A.G.; Holder G.E.; Webster A.R.; Moore A.T.;
Br. J. Ophthalmol. 95:811-817(2011)
Cited for: VARIANTS RP12 SER-157; TRP-250; LYS-312; CYS-675; VAL-710; MET-745; CYS-764; THR-836; ARG-846; TYR-948; SER-1012; ASN-1025 AND GLY-1174; VARIANTS LCA8 THR-205; SER-850; THR-1003; ARG-1103; PRO-1107; GLY-1174 AND LEU-1381; VARIANTS EARLY-ONSET RETINAL DYSTROPHY THR-741 AND ASP-1365;

CRB1 mutations in inherited retinal dystrophies.
Bujakowska K.; Audo I.; Mohand-Said S.; Lancelot M.E.; Antonio A.; Germain A.; Leveillard T.; Letexier M.; Saraiva J.P.; Lonjou C.; Carpentier W.; Sahel J.A.; Bhattacharya S.S.; Zeitz C.;
Hum. Mutat. 33:306-315(2012)
Cited for: INVOLVEMENT IN RETINAL DYSTROPHIES; VARIANTS RP12 TYR-584; PHE-740; THR-741; THR-836; TYR-948 AND ARG-1103; VARIANTS EARLY-ONSET RETINAL DYSTROPHY ASN-789 DEL; CYS-1198 AND SER-1223;

The correlation between CRB1 variants and the clinical severity of Brazilian patients with different inherited retinal dystrophy phenotypes.
Motta F.L.; Salles M.V.; Costa K.A.; Filippelli-Silva R.; Martin R.P.; Sallum J.M.F.;
Sci. Rep. 7:8654-8654(2017)
Cited for: INVOLVEMENT IN RETINAL DYSTROPHIES; VARIANTS LCA8 328-TRP--ILE-1406 DEL; ARG-948; TYR-948 AND 1226-GLY--ILE-1406 DEL; VARIANTS EARLY-ONSET RETINAL DYSTROPHY HIS-764 AND 1390-ARG--ILE-1406 DEL; VARIANTS RP12 THR-836 AND ARG-1107; VARIANTS PRO-479; PRO-921 AND ASN-1031;

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.