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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot O75326: Variant p.Arg207Trp

Gene: SEMA7A
Variant information Variant position: help 207 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 Arginine (R) to Tryptophan (W) at position 207 (R207W, p.Arg207Trp). 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

Polymorphism: help Genetic variations in SEMA7A define the John Milton Hagen blood group system (JMH) [MIM:614745]. Three different JMH phenotypes have been identified based on the presence or absence of the high-frequency JMH antigen: JMH-weak, JMH-negative, and JMH-variant. The JMH-weak and -negative phenotypes can be either acquired or inherited and are characterized by a reduction or complete loss of JMH expression on red blood cells. Individuals with the JMH-variant phenotype are usually JMH-positive and have alloantibodies compatible with JMH-negative red blood cells. The JMH-variant phenotype results from rare SEMA7A missense variants. Additional information on the polymorphism described.
Variant description: help Results in JMH-variant phenotype. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.

Sequence information Variant position: help 207 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 666 The length of the canonical sequence.
Location on the sequence: help VYSTIRKQEYNGKIPRFRRI R GESELYTSDTVMQNPQFIKA 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.


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.
Chain 45 – 648 Semaphorin-7A
Domain 53 – 490 Sema
Beta strand 204 – 210

Literature citations
The molecular diversity of Sema7A, the semaphorin that carries the JMH blood group antigens.
Seltsam A.; Strigens S.; Levene C.; Yahalom V.; Moulds M.; Moulds J.J.; Hustinx H.; Weisbach V.; Figueroa D.; Bade-Doeding C.; DeLuca D.S.; Blasczyk R.;
Transfusion 47:133-146(2007)
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.