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UniProtKB/Swiss-Prot P38398: Variant p.Leu1764Pro

Breast cancer type 1 susceptibility protein
Gene: BRCA1
Variant information

Variant position:  1764
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  US
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:  From Leucine (L) to Proline (P) at position 1764 (L1764P, p.Leu1764Pro).
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:  Similar physico-chemical property. Both residues are medium size and hydrophobic.
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -3
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:  In BC; unknown pathological significance; functionally impaired in vitro.
Any additional useful information about the variant.

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



Sequence information

Variant position:  1764
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  1863
The length of the canonical sequence.

Location on the sequence:   RNHQGPKRARESQDRKIFRG  L EICCYGPFTNMPTDQLEWMV
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                         R------NHQGPKRA-----RESQDRKIFRGLEICCYGPFTNMPTDQLEWMV

Gorilla                       R------NHQGPKRA-----RESQDRKIFRGLDICCYGPFT

                              R------NHQGPKRARESQDRESQDRKIFRGLEICCYGPFT

Rhesus macaque                R------NHQGPKRA-----RESPDRKIFRGLEICCYGPFT

Chimpanzee                    R------NHQGPKRA-----RESQDRKIFRGLEICCYGPFT

Mouse                         R------NHQGPRRS-----RESRE-KLFKGLQVYCCEPFT

Rat                           S------NHQGPRRS-----RESQE-KLFEGLQIYCCEPFT

Bovine                        R------NHQGPKRA-----RESRDKKIFKGLEICCYGPFT

Caenorhabditis elegans        KIPPSIGSEMGWLRS-----RNDEHGKLFAGRRFMILRKFT

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 1 – 1863 Breast cancer type 1 susceptibility protein
Domain 1756 – 1855 BRCT 2
Alternative sequence 64 – 1863 Missing. In isoform 2.
Mutagenesis 1755 – 1755 S -> A. No effect on in vitro phosphorylation by ATR.


Literature citations

A systematic genetic assessment of 1,433 sequence variants of unknown clinical significance in the BRCA1 and BRCA2 breast cancer-predisposition genes.
Easton D.F.; Deffenbaugh A.M.; Pruss D.; Frye C.; Wenstrup R.J.; Allen-Brady K.; Tavtigian S.V.; Monteiro A.N.A.; Iversen E.S.; Couch F.J.; Goldgar D.E.;
Am. J. Hum. Genet. 81:873-883(2007)
Cited for: VARIANTS THR-18; MET-1495; GLY-1623; ILE-1685; ALA-1685; ARG-1689; TRP-1699; GLU-1706; GLU-1708; ARG-1715; ARG-1738; PRO-1764; SER-1766 AND VAL-1788;

A high-throughput functional complementation assay for classification of BRCA1 missense variants.
Bouwman P.; van der Gulden H.; van der Heijden I.; Drost R.; Klijn C.N.; Prasetyanti P.; Pieterse M.; Wientjens E.; Seibler J.; Hogervorst F.B.; Jonkers J.;
Cancer Discov. 3:1142-1155(2013)
Cited for: CHARACTERIZATION OF VARIANTS BC PHE-4; THR-18; GLN-45; GLY-61; GLY-64; TYR-67; LYS-132; HIS-142; PHE-147; PRO-165; TRP-170; TYR-186; ILE-191; MET-231; VAL-245; VAL-246; LEU-271; PHE-668; ASN-695; LEU-798; TYR-810; LYS-826; GLN-841; HIS-856; ASN-1101; ASN-1140; GLY-1140; LYS-1214; LYS-1236; SER-1267; VAL-1282; SER-1297 DEL; ARG-1301; LYS-1346; ILE-1378; VAL-1400; PRO-1407; THR-1411; GLY-1443; GLY-1448; CYS-1486; MET-1534; PRO-1589; THR-1628; PRO-1651; PHE-1651; PHE-1655; ARG-1686; GLN-1686; VAL-1688 DEL; ILE-1691; TRP-1699; GLN-1699; GLU-1706; ALA-1706; GLU-1708; CYS-1718; ALA-1720; LYS-1735; ALA-1736; GLY-1739; VAL-1739; GLN-1746; THR-1753; PRO-1764; SER-1767; VAL-1770; CYS-1782; THR-1789; ASP-1794; ASP-1804; ARG-1812; ARG-1837 AND LEU-1862; VARIANTS CYS-105; CYS-866; ALA-1060; LYS-1250 AND ILE-1652;

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.