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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P13569: Variant p.Ala120Thr

Cystic fibrosis transmembrane conductance regulator
Gene: CFTR
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Variant information Variant position: help 120 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 Alanine (A) to Threonine (T) at position 120 (A120T, p.Ala120Thr). 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
Variant description: help In CF. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 120 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 1480 The length of the canonical sequence.
Location on the sequence: help LLLGRIIASYDPDNKEERSI A IYLGIGLCLLFIVRTLLLHP 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                         LLLGRIIASYDPDNKEERSIAIYLGIGLCLLFIVRTLLLHP

Gorilla                       LLLGRIIASYDPDNKEERSIAIYLGIGLCLLFIVRTLLLHP

                              LLLGRIIASYDPDNKQERSIAIYLAIGLCLLFIMRPLLLHP

Rhesus macaque                LLLGRIIASYDPDNKEERSIAIYLGIGLCLLFIVRTLLLHP

Chimpanzee                    LLLGRIIASYDPDNKEERSIAIYLGIGLCLLFIVRTLLLHP

Mouse                         VLLGRIIASYDPENKVERSIAIYLGIGLCLLFIVRTLLLHP

Rat                           VLLGRIIASYDPDNTEERSIAIYLGIGLCLLFIVRTLLLHP

Pig                           LLLGRIIASYDPDNKAERSIAIYLGVGLCLLFIVRTLLLHP

Bovine                        LLLGRIIASYDPDNKVERSIAIYLGIGLCLLFIVRTLLLHP

Rabbit                        LLLGRIIASYDPDNKVERSIAIYLGIGLCLLFVVRTLLLHP

Sheep                         LLLGRIIASYDPDNKVERSIAIYLGIGLCLLFIVRTLLLHP

Horse                         LLLGRIIASYDPDNEAERSIAIYLGIGLCLLFIVRTLLLHP

Xenopus laevis                LLLGRIIASYDRDNEHERSIAYYLAIGLCLLFVVRMLLLHP

Zebrafish                     QLLGRIIASFDPAHEPERANGYFLAFGLGLLFTARFLLLQP
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 – 1480 Cystic fibrosis transmembrane conductance regulator
Topological domain 99 – 122 Extracellular
Domain 81 – 365 ABC transmembrane type-1 1
Helix 120 – 164



Literature citations
Analysis of the CFTR gene in the Spanish population: SSCP-screening for 60 known mutations and identification of four new mutations (Q30X, A120T, 1812-1 G-->A, and 3667del4).
Chillon M.; Casals T.; Gimenez J.; Nunes V.; Estivill X.;
Hum. Mutat. 3:223-230(1994)
Cited for: VARIANT CF THR-120;
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.