rs373481458

Positions:

• chr16-2080309-C-A
• chr16-2080309-C-G
• chr16-2080309-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_000548.5(TSC2):​c.3542C>A​(p.Thr1181Lys) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: TSC2 NM_000548.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 4.17

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.1488693).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TSC2	NM_000548.5	c.3542C>A	p.Thr1181Lys	missense_variant	30/42	ENST00000219476.9	NP_000539.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TSC2	ENST00000219476.9	c.3542C>A	p.Thr1181Lys	missense_variant	30/42	5	NM_000548.5	ENSP00000219476

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Tuberous sclerosis 2 Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Apr 28, 2021	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. 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. This variant has not been reported in the literature in individuals with TSC2-related conditions. ClinVar contains an entry for this variant (Variation ID: 997565). This variant is not present in population databases (ExAC no frequency). This sequence change replaces threonine with lysine at codon 1181 of the TSC2 protein (p.Thr1181Lys). The threonine residue is weakly conserved and there is a moderate physicochemical difference between threonine and lysine. -
Uncertain significance, criteria provided, single submitter	clinical testing	Baylor Genetics	May 21, 2020	This variant was determined to be of uncertain significance according to ACMG Guidelines, 2015 [PMID:25741868]. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Uncertain	0.12	D
BayesDel_noAF	Uncertain	-0.060
CADD	Benign	18
DANN	Benign	0.42
DEOGEN2	Uncertain	0.49	T;.;.;.;.;.;.;.;.;.;.;.;T;.;T
Eigen	Benign	-0.62
Eigen_PC	Benign	-0.60
FATHMM_MKL	Uncertain	0.82	D
LIST_S2	Uncertain	0.96	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D
M_CAP	Uncertain	0.15	D
MetaRNN	Benign	0.15	T;T;T;T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Uncertain	-0.21	T
MutationAssessor	Benign	1.7	L;.;.;.;.;.;.;.;.;L;.;.;.;.;.
MutationTaster	Benign	0.80	N;N;N;N;N;N;N
PrimateAI	Benign	0.36	T
PROVEAN	Benign	-1.7	N;.;.;N;.;N;.;.;N;N;.;.;.;.;N
REVEL	Uncertain	0.52
Sift	Benign	0.41	T;.;.;T;.;T;.;.;T;T;.;.;.;.;T
Sift4G	Benign	0.71	T;.;.;T;.;T;.;.;T;T;.;.;.;.;T
Polyphen		0.36	B;.;.;.;B;P;.;.;B;B;.;.;.;.;.
Vest4		0.49
MutPred		0.38		Gain of solvent accessibility (P = 0.0086);.;Gain of solvent accessibility (P = 0.0086);.;.;.;.;Gain of solvent accessibility (P = 0.0086);.;Gain of solvent accessibility (P = 0.0086);.;.;.;.;.;
MVP		0.89
ClinPred		0.16	T
GERP RS		2.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.045
gMVP		0.33

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs373481458; hg19: chr16-2130310;