UniProtKB/Swiss-Prot Q99250: Variant p.Thr218Lys

Sodium channel protein type 2 subunit alpha
Gene: SCN2A
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Variant information Variant position:

218 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant:

US 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:

From Threonine (T) to Lysine (K) at position 218 (T218K, p.Thr218Lys). 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 polar (T) to large size and basic (K) 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
Variant description:

In DEE11; uncertain significance. Any additional useful information about the variant.

Sequence information Variant position:

218 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length:

2005 The length of the canonical sequence.
Location on the sequence:

VITFAYVTEFVDLGNVSALR T FRVLRALKTISVIPGLKTIV 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                         VITFAYVTEFVDLGNVSALRTFRVLRALKTISVIPGLKTIV

Mouse                         VITFAYVTEFVNLGNVSALRTFRVLRALKTISVIPGLKTIV

Rat                           VITFAYVTEFVNLGNVSALRTFRVLRALKTISVIPGLKTIV

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.

Type	Positions	Description
Chain	1 – 2005	Sodium channel protein type 2 subunit alpha
Transmembrane	215 – 231	Helical; Name=S4 of repeat I
Repeat	111 – 456	I
Glycosylation	212 – 212	N-linked (GlcNAc...) asparagine
Alternative sequence	209 – 209	D -> N. In isoform 2.
Helix	218 – 226

Literature citations
SCN2A encephalopathy: A major cause of epilepsy of infancy with migrating focal seizures.
Howell K.B.; McMahon J.M.; Carvill G.L.; Tambunan D.; Mackay M.T.; Rodriguez-Casero V.; Webster R.; Clark D.; Freeman J.L.; Calvert S.; Olson H.E.; Mandelstam S.; Poduri A.; Mefford H.C.; Harvey A.S.; Scheffer I.E.;
Neurology 85:958-966(2015)
Cited for: VARIANTS DEE11 ILE-136; LYS-218; LEU-856; ASN-905; CYS-928; ARG-1593; VAL-1634 AND GLN-1882; VARIANT BFIS3 SER-240; VARIANT LYS-976;

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.