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UniProtKB/Swiss-Prot Q8IY17: Variant p.Gly840Glu

Neuropathy target esterase
Gene: PNPLA6
Variant information

Variant position:  840
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 Glycine (G) to Glutamate (E) at position 840 (G840E, p.Gly840Glu).
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 glycine (G) to medium size and acidic (E)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -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

Involvement in disease:  Spastic paraplegia 39, autosomal recessive (SPG39) [MIM:612020]: A form of spastic paraplegia, a neurodegenerative disorder characterized by a slow, gradual, progressive weakness and spasticity of the lower limbs. Rate of progression and the severity of symptoms are quite variable. Initial symptoms may include difficulty with balance, weakness and stiffness in the legs, muscle spasms, and dragging the toes when walking. In some forms of the disorder, bladder symptoms (such as incontinence) may appear, or the weakness and stiffness may spread to other parts of the body. SPG39 is associated with a motor axonopathy affecting upper and lower limbs and resulting in progressive wasting of distal upper and lower extremity muscles. {ECO:0000269|PubMed:18313024, ECO:0000269|PubMed:24355708}. 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 SPG39.
Any additional useful information about the variant.

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



Sequence information

Variant position:  840
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  1375
The length of the canonical sequence.

Location on the sequence:   IIRARLGASALDSIQEFRLS  G WLAQQEDAHRIVLYQTDASL
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                         IIRARLGASALDSIQEFRLSGWLAQQEDAHRIVLYQTDASL

Mouse                         VIRALLGASALDSIQEFRLSGWLAQQEDAHRIVLYQTDTSL

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 – 1375 Neuropathy target esterase
Topological domain 81 – 1375 Cytoplasmic


Literature citations

PNPLA6 mutations cause Boucher-Neuhauser and Gordon Holmes syndromes as part of a broad neurodegenerative spectrum.
Synofzik M.; Gonzalez M.A.; Lourenco C.M.; Coutelier M.; Haack T.B.; Rebelo A.; Hannequin D.; Strom T.M.; Prokisch H.; Kernstock C.; Durr A.; Schols L.; Lima-Martinez M.M.; Farooq A.; Schule R.; Stevanin G.; Marques W. Jr.; Zuchner S.;
Brain 137:69-77(2014)
Cited for: VARIANTS SPG39 ILE-263 AND GLU-840; VARIANTS BNHS TRP-578; LEU-1045; ILE-1058; SER-1066; MET-1110 AND LEU-1122; VARIANTS GLY-1100 AND GLY-1362;

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.