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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P01225: Variant p.Ser20Ile

Follitropin subunit beta
Gene: FSHB
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Variant information Variant position: help 20 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 Serine (S) to Isoleucine (I) at position 20 (S20I, p.Ser20Ile). 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 polar (S) to medium size and hydrophobic (I) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help -2 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

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


Sequence information Variant position: help 20 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 129 The length of the canonical sequence.
Location on the sequence: help MKTLQFFFLFCCWKAICCN S CELTNITIAIEKEECRFCIS 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                         MKTLQFFFLFCCWKAICCNSCELTNITIAIEKEECRFCIS

Gorilla                       MKTLQFFFLFCCWKAICCNSCELTNITIAIEKEECRFCIS

Chimpanzee                    MKTLQFFFLFCCWKAICCNSCELTNITIAIEKEECRFCIS

Mouse                         MKLIQLCILFWCWRAICCHSCELTNITISVEKEECRFCIS

Rat                           MKSIQLCILLWCLRAVCCHSCELTNITISVEKEECRFCIS

Pig                           MKSLQFCFLFCCWKAICCNSCELTNITITVEKEECNFCIS

Bovine                        MKSVQFCFLFCCWRAICCRSCELTNITITVEKEECGFCIS

Rabbit                        MKSVQFCFLFCCWKAICCSSCELTNITIAVEKEECRFCIS

Goat                          MKSVQFCFLFCCWRAICCRSCELTNITITVEKEECSFCIS

Sheep                         MKSVQFCFLFCCWRAICCRSCELTNITITVEKEECSFCIS

Horse                         MKSVQFCFLFCCWKAVCCNSCELTNITIAVEKEECGFCIS

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 19 – 129 Follitropin subunit beta
Glycosylation 25 – 25 N-linked (GlcNAc...) asparagine



Literature citations
Characterization of single-nucleotide polymorphisms in coding regions of human genes.
Cargill M.; Altshuler D.; Ireland J.; Sklar P.; Ardlie K.; Patil N.; Shaw N.; Lane C.R.; Lim E.P.; Kalyanaraman N.; Nemesh J.; Ziaugra L.; Friedland L.; Rolfe A.; Warrington J.; Lipshutz R.; Daley G.Q.; Lander E.S.;
Nat. Genet. 22:231-238(1999)
Cited for: VARIANT ILE-20;
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.