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UniProtKB/Swiss-Prot O75962: Variant p.Arg1428Gln

Triple functional domain protein
Gene: TRIO
Variant information

Variant position:  1428
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 Arginine (R) to Glutamine (Q) at position 1428 (R1428Q, p.Arg1428Gln).
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 large size and basic (R) to medium size and polar (Q)
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:  Mental retardation, autosomal dominant 44 (MRD44) [MIM:617061]: A form of mental retardation, a disorder characterized by significantly below average general intellectual functioning associated with impairments in adaptive behavior and manifested during the developmental period. MRD44 patients manifest developmental delay, variable intellectual disability, distinctive facial features, and abnormalities of the fingers. Most patients also have microcephaly. {ECO:0000269|PubMed:26721934, ECO:0000269|PubMed:27418539}. Note=The disease may be 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 MRD44; strongly reduced RAC1 activation.
Any additional useful information about the variant.

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

Sequence information

Variant position:  1428
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  3097
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.





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 – 3097 Triple functional domain protein
Domain 1292 – 1467 DH 1
Alternative sequence 1 – 2501 Missing. In isoform 3.
Mutagenesis 1426 – 1426 V -> A. 90% decrease in nucleotide exchange activity.
Mutagenesis 1427 – 1427 Q -> A. 80% decrease in nucleotide exchange activity.
Mutagenesis 1428 – 1428 R -> A. 80% decrease in nucleotide exchange activity.
Mutagenesis 1430 – 1430 T -> A. 80% decrease in nucleotide exchange activity.
Mutagenesis 1431 – 1431 K -> A. Loss of nucleotide exchange activity.
Mutagenesis 1434 – 1434 L -> A. 40% decrease in nucleotide exchange activity.
Mutagenesis 1437 – 1437 K -> A. No change in nucleotide exchange activity.
Mutagenesis 1438 – 1438 E -> A. 30% decrease in nucleotide exchange activity.
Helix 1424 – 1441

Literature citations

Mutations specific to the Rac-GEF domain of TRIO cause intellectual disability and microcephaly.
Pengelly R.J.; Greville-Heygate S.; Schmidt S.; Seaby E.G.; Jabalameli M.R.; Mehta S.G.; Parker M.J.; Goudie D.; Fagotto-Kaufmann C.; Mercer C.; Debant A.; Ennis S.; Baralle D.;
J. Med. Genet. 53:735-742(2016)

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.