rs774405431
Positions:
Variant summary
Our verdict is Likely benign. Variant got -3 ACMG points: 1P and 4B. PP2BS2
The NM_000222.3(KIT):c.2683G>A(p.Ala895Thr) variant causes a missense change. The variant allele was found at a frequency of 0.0000167 in 1,613,772 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A895S) has been classified as Uncertain significance.
Frequency
Genomes: 𝑓 0.000033 ( 0 hom., cov: 32)
Exomes 𝑓: 0.000015 ( 0 hom. )
Consequence
KIT
NM_000222.3 missense
NM_000222.3 missense
Scores
1
11
5
Clinical Significance
Conservation
PhyloP100: 4.74
Genes affected
KIT (HGNC:6342): (KIT proto-oncogene, receptor tyrosine kinase) This gene encodes a receptor tyrosine kinase. This gene was initially identified as a homolog of the feline sarcoma viral oncogene v-kit and is often referred to as proto-oncogene c-Kit. The canonical form of this glycosylated transmembrane protein has an N-terminal extracellular region with five immunoglobulin-like domains, a transmembrane region, and an intracellular tyrosine kinase domain at the C-terminus. Upon activation by its cytokine ligand, stem cell factor (SCF), this protein phosphorylates multiple intracellular proteins that play a role in in the proliferation, differentiation, migration and apoptosis of many cell types and thereby plays an important role in hematopoiesis, stem cell maintenance, gametogenesis, melanogenesis, and in mast cell development, migration and function. This protein can be a membrane-bound or soluble protein. Mutations in this gene are associated with gastrointestinal stromal tumors, mast cell disease, acute myelogenous leukemia, and piebaldism. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, May 2020]
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ACMG classification
Classification made for transcript
Verdict is Likely_benign. Variant got -3 ACMG points.
PP2
?
Missense variant where missense usually causes diseases, KIT
BS2
?
High AC in GnomAd4 at 5 AD gene.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
KIT | NM_000222.3 | c.2683G>A | p.Ala895Thr | missense_variant | 19/21 | ENST00000288135.6 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
KIT | ENST00000288135.6 | c.2683G>A | p.Ala895Thr | missense_variant | 19/21 | 1 | NM_000222.3 | P4 |
Frequencies
GnomAD3 genomes ? AF: 0.0000329 AC: 5AN: 152136Hom.: 0 Cov.: 32
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GnomAD3 exomes AF: 0.0000239 AC: 6AN: 250880Hom.: 0 AF XY: 0.0000148 AC XY: 2AN XY: 135572
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GnomAD4 exome AF: 0.0000151 AC: 22AN: 1461636Hom.: 0 Cov.: 32 AF XY: 0.0000193 AC XY: 14AN XY: 727130
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GnomAD4 genome ? AF: 0.0000329 AC: 5AN: 152136Hom.: 0 Cov.: 32 AF XY: 0.0000404 AC XY: 3AN XY: 74314
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ClinVar
Significance: Uncertain significance
Submissions summary: Uncertain:4
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Gastrointestinal stromal tumor Uncertain:2
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Jan 26, 2024 | This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 895 of the KIT protein (p.Ala895Thr). This variant is present in population databases (rs774405431, gnomAD 0.008%). This variant has not been reported in the literature in individuals affected with KIT-related conditions. ClinVar contains an entry for this variant (Variation ID: 409723). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. - |
Uncertain significance, criteria provided, single submitter | clinical testing | Baylor Genetics | Feb 02, 2024 | - - |
KIT-related disorder Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | PreventionGenetics, part of Exact Sciences | Oct 18, 2023 | The KIT c.2683G>A variant is predicted to result in the amino acid substitution p.Ala895Thr. To our knowledge, this variant has not been reported in the literature. This variant is reported in 0.0080% of alleles in individuals of African descent in gnomAD (http://gnomad.broadinstitute.org/variant/4-55602973-G-A). It is interpreted as uncertain in the ClinVar database (https://www.ncbi.nlm.nih.gov/clinvar/variation/409723/). At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. - |
Hereditary cancer-predisposing syndrome Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Ambry Genetics | Nov 06, 2023 | The p.A895T variant (also known as c.2683G>A), located in coding exon 19 of the KIT gene, results from a G to A substitution at nucleotide position 2683. The alanine at codon 895 is replaced by threonine, an amino acid with similar properties. This amino acid position is highly conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Pathogenic
BayesDel_addAF
Benign
T
BayesDel_noAF
Benign
CADD
Pathogenic
DANN
Uncertain
Eigen
Benign
Eigen_PC
Benign
FATHMM_MKL
Uncertain
D
LIST_S2
Uncertain
D;D
M_CAP
Uncertain
D
MetaRNN
Uncertain
D;D
MetaSVM
Uncertain
T
MutationTaster
Benign
N;N
PrimateAI
Uncertain
T
PROVEAN
Uncertain
D;D
REVEL
Uncertain
Sift
Uncertain
D;D
Sift4G
Uncertain
D;D
Polyphen
D;D
Vest4
MVP
MPC
1.3
ClinPred
D
GERP RS
Varity_R
gMVP
Splicing
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SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at