16-2088287-A-G
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Variant summary
Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1PM2
The NM_000548.5(TSC2):āc.5221A>Gā(p.Ile1741Val) variant causes a missense change. The variant allele was found at a frequency of 0.0000131 in 152,160 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (ā ā ).
Frequency
Genomes: š 0.000013 ( 0 hom., cov: 34)
Consequence
TSC2
NM_000548.5 missense
NM_000548.5 missense
Scores
3
9
7
Clinical Significance
Conservation
PhyloP100: 5.42
Genes affected
TSC2 (HGNC:12363): (TSC complex subunit 2) This gene is a tumor suppressor gene that encodes the growth inhibitory protein tuberin. Tuberin interacts with hamartin to form the TSC protein complex which functions in the control of cell growth. This TSC protein complex negatively regulates mammalian target of rapamycin complex 1 (mTORC1) signaling which is a major regulator of anabolic cell growth. Mutations in this gene have been associated with tuberous sclerosis and lymphangioleiomyomatosis. [provided by RefSeq, May 2022]
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ACMG classification
Classification made for transcript
Verdict is Uncertain_significance. Variant got 4 ACMG points.
PM1
In a domain Rap-GAP (size 227) in uniprot entity TSC2_HUMAN there are 284 pathogenic changes around while only 47 benign (86%) in NM_000548.5
PM2
Very rare variant in population databases, with high coverage;
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | Protein | UniProt |
---|---|---|---|---|---|---|---|---|
TSC2 | NM_000548.5 | c.5221A>G | p.Ile1741Val | missense_variant | 41/42 | ENST00000219476.9 | NP_000539.2 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
TSC2 | ENST00000219476.9 | c.5221A>G | p.Ile1741Val | missense_variant | 41/42 | 5 | NM_000548.5 | ENSP00000219476 |
Frequencies
GnomAD3 genomes AF: 0.0000131 AC: 2AN: 152160Hom.: 0 Cov.: 34
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GnomAD4 exome Cov.: 34
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GnomAD4 genome AF: 0.0000131 AC: 2AN: 152160Hom.: 0 Cov.: 34 AF XY: 0.0000269 AC XY: 2AN XY: 74330
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ClinVar
Significance: Uncertain significance
Submissions summary: Uncertain:5
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Tuberous sclerosis 2 Uncertain:2
Uncertain significance, criteria provided, single submitter | clinical testing | Genome-Nilou Lab | Nov 07, 2021 | - - |
Uncertain significance, criteria provided, single submitter | clinical testing | Labcorp Genetics (formerly Invitae), Labcorp | Dec 31, 2023 | This sequence change replaces isoleucine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 1741 of the TSC2 protein (p.Ile1741Val). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with TSC2-related conditions. ClinVar contains an entry for this variant (Variation ID: 406082). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt TSC2 protein function with a negative predictive value of 95%. 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. - |
not provided Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | GeneDx | Nov 25, 2023 | Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge - |
Isolated focal cortical dysplasia type II Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Baylor Genetics | Jun 15, 2023 | - - |
Hereditary cancer-predisposing syndrome Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Ambry Genetics | Nov 03, 2020 | The p.I1741V variant (also known as c.5221A>G), located in coding exon 40 of the TSC2 gene, results from an A to G substitution at nucleotide position 5221. The isoleucine at codon 1741 is replaced by valine, an amino acid with highly similar properties. This amino acid position is not well 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
Benign
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Uncertain
CADD
Uncertain
DANN
Pathogenic
DEOGEN2
Uncertain
T;.;.;.;.;.;.;.;.;.;.;.;T;.;T
Eigen
Benign
Eigen_PC
Benign
FATHMM_MKL
Uncertain
D
LIST_S2
Uncertain
D;D;D;D;D;D;D;D;D;D;D;D;D;D;D
M_CAP
Uncertain
D
MetaRNN
Uncertain
D;D;D;D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM
Uncertain
D
MutationAssessor
Benign
N;.;.;.;.;.;.;.;.;.;.;.;.;.;.
MutationTaster
Benign
D;D;D;D;D;D;D
PrimateAI
Uncertain
T
PROVEAN
Benign
N;.;.;N;.;N;.;.;N;N;.;.;.;.;N
REVEL
Pathogenic
Sift
Benign
T;.;.;D;.;D;.;.;D;D;.;.;.;.;D
Sift4G
Uncertain
D;.;.;D;.;D;.;.;D;D;.;.;.;.;D
Polyphen
D;.;.;.;P;P;.;.;P;P;.;.;.;.;.
Vest4
MVP
ClinPred
D
GERP RS
RBP_binding_hub_radar
RBP_regulation_power_radar
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