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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot Q8N0V5: Variant p.Ala169Thr

N-acetyllactosaminide beta-1,6-N-acetylglucosaminyl-transferase
Gene: GCNT2
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Variant information Variant position: help 169 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help LB/B 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 Alanine (A) to Threonine (T) at position 169 (A169T, p.Ala169Thr). 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 small size and hydrophobic (A) to medium size and polar (T) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help 0 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

Polymorphism: help GCNT2 is involved in determining the blood group I system (Ii) [MIM:110800]. The i (fetal) and I (adult) antigens are determined by linear and branched poly-N-acetyllactosaminoglycans, respectively. A replacement during development of i by I is dependent on the appearance of a beta-1,6-N-acetylglucosaminyltransferase, the I-branching enzyme. The expression of the blood group I antigen in erythrocytes is determined by isoform C of GCNT2. Additional information on the polymorphism described.
Variant description: help Defines the adult i phenotype. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 169 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 402 The length of the canonical sequence.
Location on the sequence: help NAFLASKKESVVYGGISRLQ A DLNCLEDLVASEVPWKYVIN 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.
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 – 402 N-acetyllactosaminide beta-1,6-N-acetylglucosaminyl-transferase
Topological domain 24 – 400 Lumenal
Alternative sequence 1 – 308 MMGSWKHCLFSASLISALIFVFVYNTELWENKRFLRAALSNASLLAEACHQIFEGKVFYPTENALKTTLDEATCYEYMVRSHYVTETLSEEEAGFPLAYTVTIHKDFGTFERLFRAIYMPQNVYCVHLDQKATDAFKGAVKQLLSCFPNAFLASKKESVVYGGISRLQADLNCLEDLVASEVPWKYVINTCGQDFPLKTNREIVQYLKGFKGKNITPGVLPPDHAVGRTKYVHQELLNHKNSYVIKTTKLKTPPPHDMVIYFGTAYVALTRDFANFVLQDQLALDLLSWSKDTYSPDEHFWVTLNRIP -> MNFWRYCFFAFTLLSVVIFVRFYSSQLSPPKSYEKLNSSSERYFRKTACNHALEKMPVFLWENILPSPLRSVPCKDYLTQNHYITSPLSEEEAAFPLAYVMVIHKDFDTFERLFRAIYMPQNVYCVHVDEKAPAEYKESVRQLLSCFQNAFIASKTESVVYAGISRLQADLNCLKDLVASEVPWKYVINTCGQDFPLKTNREIVQHLKGFKGKNITPGVLPPDHAIKRTKYVHQEHTDKGGFFVKNTNILKTSPPHQLTIYFGTAYVALTRDFVDFVLRDQRAIDLLQWSKDTYSPDEHFWVTLNRVS. In isoform C.
Alternative sequence 1 – 294 MMGSWKHCLFSASLISALIFVFVYNTELWENKRFLRAALSNASLLAEACHQIFEGKVFYPTENALKTTLDEATCYEYMVRSHYVTETLSEEEAGFPLAYTVTIHKDFGTFERLFRAIYMPQNVYCVHLDQKATDAFKGAVKQLLSCFPNAFLASKKESVVYGGISRLQADLNCLEDLVASEVPWKYVINTCGQDFPLKTNREIVQYLKGFKGKNITPGVLPPDHAVGRTKYVHQELLNHKNSYVIKTTKLKTPPPHDMVIYFGTAYVALTRDFANFVLQDQLALDLLSWSKDTY -> MPLSMRYLFIISVSSVIIFIVFSVFNFGGDPSFQRLNISDPLRLTQVCTSFINGKTRFLWKNKLMIHEKSSCKEYLTQSHYITAPLSKEEADFPLAYIMVIHHHFDTFARLFRAIYMPQNIYCVHVDEKATTEFKDAVEQLLSCFPNAFLASKMEPVVYGGISRLQADLNCIRDLSAFEVSWKYVINTCGQDFPLKTNKEIVQYLKGFKGKNITPGVLPPAHAIGRTKYVHQEHLGKELSYVIRTTALKPPPPHNLTIYFGSAYVALSREFANFVLHDPRAVDLLQWSKDTF. In isoform B.



Literature citations
The molecular genetics of the human I locus and molecular background explain the partial association of the adult i phenotype with congenital cataracts.
Yu L.C.; Twu Y.C.; Chou M.L.; Reid M.E.; Gray A.R.; Moulds J.M.; Chang C.Y.; Lin M.;
Blood 101:2081-2088(2003)
Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORMS A; B AND C); ALTERNATIVE SPLICING; TISSUE SPECIFICITY; VARIANTS THR-169 AND GLN-228;
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.