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UniProtKB/Swiss-Prot P51170: Variant p.Arg178Trp

Amiloride-sensitive sodium channel subunit gamma
Gene: SCNN1G
Chromosomal location: 16p12
Variant information

Variant position:  178
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  Polymorphism
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 Arginine (R) to Tryptophan (W) at position 178 (R178W, p.Arg178Trp).
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 basic (R) to large size and aromatic (W)
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



Sequence information

Variant position:  178
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  649
The length of the canonical sequence.

Location on the sequence:   IPLLIFDQDEKGKARDFFTG  R KRKVGGSIIHKASNVMHIES
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                         IPLLIFD--QDEKGKARDFFT-GRKRKVGGSIIHKASNVMHI-ES

Chimpanzee                    IPLLIFD--QDEKGKARDFFT-GRKRKVGGSIIHKASNVMH

Mouse                         IPLLVFN--ENEKGKARDFFT-GRKRKISGKIIHKASNVMH

Rat                           IPLLVFN--ENEKGKARDFFT-GRKRKISGKIIHKASNVMH

Bovine                        APLMAFE--KGDTGKARDFFT-GRKRKVNARIIHKASDVMH

Rabbit                        VPLLIFN--RDEKGKARDFLSLGRKRKISGNIIHKASNVVQ

Xenopus laevis                IPLYRLESVKGSQLVVSDLKT-KKRTRMSAKVIHRDAESVQ

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 – 649 Amiloride-sensitive sodium channel subunit gamma
Topological domain 77 – 541 Extracellular


Literature citations

Cloning and expression of the beta- and gamma-subunits of the human epithelial sodium channel.
McDonald F.J.; Snyder P.M.; Price M.P.; Welsh M.J.;
Am. J. Physiol. 268:C1157-C1163(1995)
Cited for: NUCLEOTIDE SEQUENCE [MRNA]; VARIANTS TRP-178; PRO-502 AND SER-614; SUBUNIT;

Polymorphisms of amiloride-sensitive sodium channel subunits in five sporadic cases of pseudohypoaldosteronism: do they have pathologic potential?
Arai K.; Zachman K.; Shibasaki T.; Chrousos G.P.;
J. Clin. Endocrinol. Metab. 84:2434-2437(1999)
Cited for: VARIANTS TRP-178; PRO-502 AND SER-614;

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.