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UniProtKB/Swiss-Prot P35575: Variant p.Trp77Arg

Glucose-6-phosphatase catalytic subunit 1
Gene: G6PC1
Variant information

Variant position:  77
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  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:  From Tryptophan (W) to Arginine (R) at position 77 (W77R, p.Trp77Arg).
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 large size and aromatic (W) to large size and basic (R)
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 GSD1A.
Any additional useful information about the variant.

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



Sequence information

Variant position:  77
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  357
The length of the canonical sequence.

Location on the sequence:   VGIKLLWVAVIGDWLNLVFK  W ILFGQRPYWWVLDTDYYSNT
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                         VGIKLLWVAVIGDWLNLVFKWILFGQRPYWWVLDTDYYSNT

Mouse                         VGINLLWVAVVGDWFNLVFKWILFGQRPYWWVLDTDYYSNS

Rat                           VGINLLWVAVVGDWFNLVFKWILFGQRPYWWVLDTDYYSNS

Bovine                        VGIKLLWVAVIGDWLNLVFKWILFGQRPYWWVLDTDYYSNT

Cat                           VGIKLLWVAVIGDWLNLVFKWILFGQRPYWWVMDTDYYSNA

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 – 357 Glucose-6-phosphatase catalytic subunit 1
Transmembrane 61 – 81 Helical
Binding site 83 – 83 Substrate
Glycosylation 96 – 96 N-linked (GlcNAc...) asparagine


Literature citations

Mutation analysis in 24 French patients with glycogen storage disease type 1a.
Chevalier-Porst F.; Bozon D.; Bonardot A.-M.; Bruni N.; Mithieux G.; Mathieu M.; Maire I.;
J. Med. Genet. 33:358-360(1996)
Cited for: VARIANTS GSD1A VAL-38; ARG-77; LYS-110; THR-124; GLU-184; ARG-188 AND PRO-211;

Identification of mutations in the glucose-6-phosphatase gene in Czech and Slovak patients with glycogen storage disease type Ia, including novel mutations K76N, V166A and 540del5.
Kozak L.; Francova H.; Hrabincova E.; Stastna S.; Peskova K.; Elleder M.;
Hum. Mutat. 16:89-89(2000)
Cited for: VARIANTS GSD1A ASN-76; ARG-77; CYS-83; ALA-166; ARG-188 AND CYS-295;

Glycogen storage disease type I: diagnosis and phenotype/genotype correlation.
Matern D.; Seydewitz H.H.; Bali D.; Lang C.; Chen Y.-T.;
Eur. J. Pediatr. 161:S10-S19(2002)
Cited for: VARIANTS GSD1A ARG-20; VAL-38; PRO-65; ARG-68; ARG-77; ARG-81; CYS-83; HIS-83; LYS-110; LEU-113; LEU-156; GLN-170; CYS-177; SER-178; ARG-188; SER-188; ARG-236; PRO-265; VAL-270; PHE-327 DEL AND ARG-345;

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.