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UniProtKB/Swiss-Prot O60741: Variant p.Leu157Val

Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 1
Gene: HCN1
Variant information

Variant position:  157
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  Unclassified
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 Leucine (L) to Valine (V) at position 157 (L157V, p.Leu157Val).
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:  Similar physico-chemical property. Both residues are medium size and hydrophobic.
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:  Generalized epilepsy with febrile seizures plus 10 (GEFSP10) [MIM:618482]: An autosomal dominant neurologic disorder with incomplete penetrance, characterized by variable types of seizures including absence, tonic-clonic, febrile, focal, and eyelid myoclonia. Some patients have normal neurologic development. Others have mild-to-moderate intellectual disability or autism spectrum disorder. {ECO:0000269|PubMed:29936235, ECO:0000269|PubMed:30351409}. 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 GEFSP10; unknown pathological significance; reduced current density; affects channel gating properties as the half-activation voltage is shifted to the depolarizing direction; neurons expressing mutant channels show increased excitability.
Any additional useful information about the variant.

Sequence information

Variant position:  157
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  890
The length of the canonical sequence.

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.





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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.

Chain 1 – 890 Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 1
Transmembrane 143 – 164 Helical; Name=Segment S1
Helix 140 – 166

Literature citations

A novel de novo HCN1 loss-of-function mutation in genetic generalized epilepsy causing increased neuronal excitability.
Bonzanni M.; DiFrancesco J.C.; Milanesi R.; Campostrini G.; Castellotti B.; Bucchi A.; Baruscotti M.; Ferrarese C.; Franceschetti S.; Canafoglia L.; Ragona F.; Freri E.; Labate A.; Gambardella A.; Costa C.; Rivolta I.; Gellera C.; Granata T.; Barbuti A.; DiFrancesco D.;
Neurobiol. Dis. 118:55-63(2018)

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.