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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P29033: Variant p.Arg143Trp

Gap junction beta-2 protein
Gene: GJB2
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Variant information Variant position: help 143 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help 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: help From Arginine (R) to Tryptophan (W) at position 143 (R143W, p.Arg143Trp). 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: help 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: help -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: help In DFNB1A. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 143 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 226 The length of the canonical sequence.
Location on the sequence: help TQKVRIEGSLWWTYTSSIFF R VIFEAAFMYVFYVMYDGFSM 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: help The multiple alignment of the region surrounding the variant against various orthologous sequences. 
Human                         TQKVRIEGSLWWTYTSSIFFRVIFEAAFMYVFYVMYDGFSM

Gorilla                       TQKVRIEGSLWWTYTSSIFFRVIFEAAFMYVFYVMYDGFSM

Rhesus macaque                TQKVRIEGSLWWTYTSSIFFRVVFEAAFMYVFYVMYDGFSM

Mouse                         TQKVRIEGSLWWTYTTSIFFRVIFEAVFMYVFYIMYNGFFM

Rat                           TQKVRIEGSLWWTYTTSIFFRVIFEAVFMYVFYIMYNGFFM

Bovine                        KQKVRIEGSLWWTYTGSIFFRVIFEAAFMYVFYVMYDGFAM

Sheep                         NQKVRIEGSLWWTYTGSIFFRVIFEAAFMYVFYVMYDGFAM
Sequence annotation in neighborhood: help 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 – 226 Gap junction beta-2 protein
Transmembrane 136 – 156 Helical
Disulfide bond 53 – 180
Disulfide bond 60 – 174
Disulfide bond 64 – 169
Helix 130 – 158



Literature citations
Pattern of connexin 26 (GJB2) mutations causing sensorineural hearing impairment in Ghana.
Hamelmann C.; Amedofu G.K.; Albrecht K.; Muntau B.; Gelhaus A.; Brobby G.W.; Horstmann R.D.;
Hum. Mutat. 18:84-85(2001)
Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA]; VARIANTS DFNB1A PRO-79; TRP-143; ALA-178; LYS-203 AND PRO-214; VARIANTS DFNA3A GLN-184 AND SER-197; GJB2 mutations: passage through Iran.
Najmabadi H.; Nishimura C.; Kahrizi K.; Riazalhosseini Y.; Malekpour M.; Daneshi A.; Farhadi M.; Mohseni M.; Mahdieh N.; Ebrahimi A.; Bazazzadegan N.; Naghavi A.; Avenarius M.; Arzhangi S.; Smith R.J.H.;
Am. J. Med. Genet. A 133:132-137(2005)
Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA]; VARIANTS DFNB1A HIS-32; LYS-80; ILE-93; GLU-120 DEL; LYS-129; TRP-143 AND PRO-184; VARIANTS ILE-27; GLY-114; HIS-127 AND ILE-153; Connexin 26 R143W mutation associated with recessive nonsyndromic sensorineural deafness in Africa.
Brobby G.W.; Muller-Myhsok B.; Horstmann R.D.;
N. Engl. J. Med. 338:548-550(1998)
Cited for: VARIANT DFNB1A TRP-143; GJB2 deafness gene shows a specific spectrum of mutations in Japan, including a frequent founder mutation.
Ohtsuka A.; Yuge I.; Kimura S.; Namba A.; Abe S.; Van Laer L.; Van Camp G.; Usami S.;
Hum. Genet. 112:329-333(2003)
Cited for: VARIANTS DEAFNESS GLU-45; THR-71; ARG-86 AND TRP-143; VARIANTS ILE-27; ILE-37; GLY-114; ASN-123; LEU-191 AND THR-203;
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.