UniProtKB/SwissProt variant VAR

Variant information

Variant position:

172

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 Threonine (T) to Methionine (M) at position 172 (T172M, p.Thr172Met).

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 medium size and hydrophobic (M)

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:

Microcephaly 15, primary, autosomal recessive (MCPH15) [MIM:616486]: A form of microcephaly, a disease defined as a head circumference more than 3 standard deviations below the age, sex and ethnically matched mean. Brain weight is markedly reduced and the cerebral cortex is disproportionately small. {ECO:0000269|PubMed:26005865, ECO:0000269|PubMed:26005868}. 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 MCPH15; properly expressed at the plasma membrane; loss of LPC transport activity.

Any additional useful information about the variant.

Other resources:

Links to websites of interest for the variant.

Variant rs1057517688 [ dbSNP | Ensembl ]

Sequence information

Variant position:

172

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

Protein sequence length:

543

The length of the canonical sequence.

Location on the sequence:

FPHGQTYWYLLFYCLFETMV T CFHVPYSALTMFISTEQTER

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                         FPHGQT-----YWYLLFYCLFETMVTCFHVPYSALTMFISTEQTER

Mouse                         FPSGTESSHGFLWYLLFYCLFETLVTCFHVPYSALTMFIST

Xenopus tropicalis            FSGVSM----VIWYLVFYCLFQTLVTCFHVPYSALTMFISK

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 – 543	Sodium-dependent lysophosphatidylcholine symporter 1
Transmembrane	161 – 181	Helical
Alternative sequence	1 – 186	MAKGEGAESGSAAGLLPTSILQSTERPAQVKKEPKKKKQQLSVCNKLCYALGGAPYQVTGCALGFFLQIYLLDVAQKDEEVVFCFSSFQVGPFSASIILFVGRAWDAITDPLVGLCISKSPWTCLGRLMPWIIFSTPLAVIAYFLIWFVPDFPHGQTYWYLLFYCLFETMVTCFHVPYSALTMFIS -> MWLRWALSLPPSSCLWAEPGMPSQTPWWASASANPPGPAWVALCPGSSSPRPWPSLPTSSSGSCPTSHTARPIGTCFSIASLKQWSRVSMFPTRLSPCSSA. In isoform 3.

Literature citations

Inactivating mutations in MFSD2A, required for omega-3 fatty acid transport in brain, cause a lethal microcephaly syndrome.
Guemez-Gamboa A.; Nguyen L.N.; Yang H.; Zaki M.S.; Kara M.; Ben-Omran T.; Akizu N.; Rosti R.O.; Rosti B.; Scott E.; Schroth J.; Copeland B.; Vaux K.K.; Cazenave-Gassiot A.; Quek D.Q.; Wong B.H.; Tan B.C.; Wenk M.R.; Gunel M.; Gabriel S.; Chi N.C.; Silver D.L.; Gleeson J.G.;
Nat. Genet. 47:809-813(2015)
Cited for: INVOLVEMENT IN MCPH15; VARIANTS MCPH15 MET-172 AND LEU-179; CHARACTERIZATION OF VARIANTS MCPH15 MET-172 AND LEU-179; FUNCTION; SUBCELLULAR LOCATION;

UniProtKB/Swiss-Prot Q8NA29: Variant p.Thr172Met