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UniProtKB/Swiss-Prot P57054: Variant p.Met25Thr

Phosphatidylinositol N-acetylglucosaminyltransferase subunit P
Gene: PIGP
Chromosomal location: 21q22.2
Variant information

Variant position:  25
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  Disease [Disclaimer]
The variants are classified into three categories: Disease, Polymorphism and Unclassified.
  • Disease: Variants implicated in disease according to literature reports.
  • Polymorphism: Variants not reported to be implicated in disease.
  • Unclassified: Variants with uncertain implication in disease according to literature reports. Evidence against or in favor of a pathogenic role is limited and/or conflicting.

Residue change:  From Methionine (M) to Threonine (T) at position 25 (M25T, p.Met25Thr).
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:  Change from medium size and hydrophobic (M) to medium size and polar (T)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -1
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

Involvement in disease:  Epileptic encephalopathy, early infantile, 55 (EIEE55) [MIM:617599]: A form of epileptic encephalopathy, a heterogeneous group of severe childhood onset epilepsies characterized by refractory seizures, neurodevelopmental impairment, and poor prognosis. Development is normal prior to seizure onset, after which cognitive and motor delays become apparent. EIEE55 is an autosomal recessive condition. {ECO:0000269|PubMed:28334793}. Note=The disease is caused by mutations affecting the gene represented in this entry.
The name and a short description of the disease associated with the variant. For more information about the disease, the user can refer to OMIM, following the link provided after the disease acronym.

Variant description:  In EIEE55; reduced GPI-anchor biosynthetic process; may affect expression of isoform A.
Any additional useful information about the variant.

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



Sequence information

Variant position:  25
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  158
The length of the canonical sequence.

Location on the sequence:   STSLTLIVFLFHRLSKAPGK  M VENSPSPLPERAIYGFVLFL
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: 
The multiple alignment of the region surrounding the variant against various orthologous sequences.

Human                         STSLTLIVFLFHRLSKAPGKMVENSPSPLPERAIYGFVLFL

Mouse                         --------------------MVENSPSPLPERAIYGFVLFL

Sequence annotation in neighborhood:  
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 – 158 Phosphatidylinositol N-acetylglucosaminyltransferase subunit P
Alternative sequence 1 – 50 Missing. In isoform C.


Literature citations

Compound heterozygous mutations in the gene PIGP are associated with early infantile epileptic encephalopathy.
Johnstone D.L.; Nguyen T.T.; Murakami Y.; Kernohan K.D.; Tetreault M.; Goldsmith C.; Doja A.; Wagner J.D.; Huang L.; Hartley T.; St-Denis A.; le Deist F.; Majewski J.; Bulman D.E.; Kinoshita T.; Dyment D.A.; Boycott K.M.; Campeau P.M.;
Hum. Mol. Genet. 26:1706-1715(2017)
Cited for: INVOLVEMENT IN EIEE55; VARIANT EIEE55 THR-25; CHARACTERIZATION OF VARIANT EIEE55 THR-25; FUNCTION;

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.