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UniProtKB/Swiss-Prot P06213: Variant p.Leu120Gln

Insulin receptor
Gene: INSR
Chromosomal location: 19p13.2-p13.3
Variant information

Variant position:  120
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 120 (L120Q, p.Leu120Gln).
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:  Leprechaunism (LEPRCH) [MIM:246200]: Represents the most severe form of insulin resistance syndrome, characterized by intrauterine and postnatal growth retardation and death in early infancy. Inheritance is autosomal recessive. {ECO:0000269|PubMed:12023989, ECO:0000269|PubMed:12538626, ECO:0000269|PubMed:12970295, ECO:0000269|PubMed:1607067, ECO:0000269|PubMed:1730625, ECO:0000269|PubMed:22768670, ECO:0000269|PubMed:2365819, ECO:0000269|PubMed:24498630, ECO:0000269|PubMed:2479553, ECO:0000269|PubMed:2834824, ECO:0000269|PubMed:28765322, ECO:0000269|PubMed:7538143, ECO:0000269|PubMed:7815442, ECO:0000269|PubMed:8188715, ECO:0000269|PubMed:8326490, ECO:0000269|PubMed:8419945, ECO:0000269|PubMed:8636294, ECO:0000269|PubMed:9249867, ECO:0000269|PubMed:9299395, ECO:0000269|PubMed:9703342}. 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 LEPRCH; inhibits receptor processing.
Any additional useful information about the variant.



Sequence information

Variant position:  120
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  1382
The length of the canonical sequence.

Location on the sequence:   KDLFPNLTVIRGSRLFFNYA  L VIFEMVHLKELGLYNLMNIT
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                         KDLFPNLTVIRGSRLFFNYALVIFEMVHLKELGLYNLMNIT

Mouse                         KDLFPNLTVIRGSRLFFNYALVIFEMVHLKELGLYNLMNIT

Rat                           KDLFPNLTVIRGSRLFFNYALVIFEMVHLKELGLYNLMNIT

Xenopus laevis                KDLFPNLTVIRGTRLFFNYALVIFEMVHXKEIGLYNLMNIT

Caenorhabditis elegans        RKIFPNLRVIGGRSLIQHYALIIYRNPDL-EIGLDKLSVIR

Drosophila                    SKIFPNLSVIRGNKLFDGYALVVYSNFDLMDLGLHKLRSIT

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 28 – 758 Insulin receptor subunit alpha
Topological domain 28 – 758 Extracellular
Compositional bias 28 – 174 Leu-rich
Glycosylation 105 – 105 N-linked (GlcNAc...) asparagine
Glycosylation 138 – 138 N-linked (GlcNAc...) asparagine
Beta strand 118 – 124


Literature citations

Prevalence of mutations in the insulin receptor gene in subjects with features of the type A syndrome of insulin resistance.
Moller D.E.; Cohen O.; Yamaguchi Y.; Assiz R.; Grigorescu F.; Eberle A.; Morrow L.A.; Moses A.C.; Flier J.S.;
Diabetes 43:247-255(1994)
Cited for: VARIANT IRAN TYPE A GLN-1201;

Functional properties of a heterozygous mutation (Arg1174-->Gln) in the tyrosine kinase domain of the insulin receptor from a type A insulin resistant patient.
Moritz W.; Froesch E.R.; Boeni-Schnetzler M.;
FEBS Lett. 351:276-280(1994)
Cited for: CHARACTERIZATION OF VARIANT IRAN TYPE A GLN-1201;

Identification and functional assessment of novel and known insulin receptor mutations in five patients with syndromes of severe insulin resistance.
Maassen J.A.; Tobias E.S.; Kayserilli H.; Tukel T.; Yuksel-Apak M.; D'Haens E.; Kleijer W.J.; Fery F.; van der Zon G.C.M.;
J. Clin. Endocrinol. Metab. 88:4251-4257(2003)
Cited for: VARIANT IRAN TYPE A HIS-279; VARIANTS LEPRCH GLN-120; LEU-350; ASP-458 AND TRP-1119; CHARACTERIZATION OF VARIANT IRAN TYPE A HIS-279; CHARACTERIZATION OF VARIANTS LEPRCH GLN-120 AND ASP-458;

A novel syndrome of autosomal-dominant hyperinsulinemic hypoglycemia linked to a mutation in the human insulin receptor gene.
Hoejlund K.; Hansen T.; Lajer M.; Henriksen J.E.; Levin K.; Lindholm J.; Pedersen O.; Bech-Nielsen H.;
Diabetes 53:1592-1598(2004)
Cited for: VARIANT HHF5 GLN-1201;

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.