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UniProtKB/Swiss-Prot Q96QS3: Variant p.Leu343Gln

Homeobox protein ARX
Gene: ARX
Variant information

Variant position:  343
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 Leucine (L) to Glutamine (Q) at position 343 (L343Q, p.Leu343Gln).
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 (L) to medium size and polar (Q)
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:  Lissencephaly, X-linked 2 (LISX2) [MIM:300215]: A classic type lissencephaly associated with abnormal genitalia. Patients have severe congenital or postnatal microcephaly, lissencephaly, agenesis of the corpus callosum, neonatal-onset intractable epilepsy, poor temperature regulation, chronic diarrhea, and ambiguous or underdeveloped genitalia. {ECO:0000269|PubMed:12379852, ECO:0000269|PubMed:14722918}. 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 LISX2.
Any additional useful information about the variant.

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



Sequence information

Variant position:  343
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  562
The length of the canonical sequence.

Location on the sequence:   LLKRKQRRYRTTFTSYQLEE  L ERAFQKTHYPDVFTREELAM
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                         LLKRKQRRYRTTFTSYQLEELERAFQKTHYPDVFTREELAM

Mouse                         LLKRKQRRYRTTFTSYQLEELERAFQKTHYPDVFTREELAM

Rat                           LLKRKQRRYRTTFTSYQLEELERAFQKTHYPDVFTREELAM

Zebrafish                     MLKRKQRRYRTTFTSYQLEELERAFQKTHYPDVFTREELAM

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 – 562 Homeobox protein ARX
DNA binding 328 – 387 Homeobox


Literature citations

Mutation of ARX causes abnormal development of forebrain and testes in mice and X-linked lissencephaly with abnormal genitalia in humans.
Kitamura K.; Yanazawa M.; Sugiyama N.; Miura H.; Iizuka-Kogo A.; Kusaka M.; Omichi K.; Suzuki R.; Kato-Fukui Y.; Kamiirisa K.; Matsuo M.; Kamijo S.; Kasahara M.; Yoshioka H.; Ogata T.; Fukuda T.; Kondo I.; Kato M.; Dobyns W.B.; Yokoyama M.; Morohashi K.;
Nat. Genet. 32:359-369(2002)
Cited for: VARIANTS LISX2 HIS-332 AND GLN-343;

Mutations of ARX are associated with striking pleiotropy and consistent genotype-phenotype correlation.
Kato M.; Das S.; Petras K.; Kitamura K.; Morohashi K.; Abuelo D.N.; Barr M.; Bonneau D.; Brady A.F.; Carpenter N.J.; Cipero K.L.; Frisone F.; Fukuda T.; Guerrini R.; Iida E.; Itoh M.; Lewanda A.F.; Nanba Y.; Oka A.; Proud V.K.; Saugier-Veber P.; Schelley S.L.; Selicorni A.; Shaner R.; Silengo M.; Stewart F.; Sugiyama N.; Toyama J.; Toutain A.; Vargas A.L.; Yanazawa M.; Zackai E.H.; Dobyns W.B.;
Hum. Mutat. 23:147-159(2004)
Cited for: VARIANTS LISX2 PRO-332; HIS-332; GLN-343; ARG-353 AND THR-521; VARIANT ACCAG ASN-333;

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.