rs749593050

Variant names:

Your query was ambiguous. Multiple possible variants found:

Variant summary

Our verdict is Benign. The variant received -7 ACMG points: 0P and 7B. BP4_ModerateBP6BS2

The NM_000548.5(TSC2):c.2252G>A(p.Arg751Gln) variant causes a missense change. The variant allele was found at a frequency of 0.00000682 in 1,613,452 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R751L) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000068 ( 0 hom. )

Consequence

TSC2
NM_000548.5 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:4B:4

Conservation

PhyloP100: 3.86

Publications

3 publications found

Variant links:

COSMIC-nc: COSV54781208

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]

TSC2 Gene-Disease associations (from GenCC):

tuberous sclerosis
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
tuberous sclerosis 2
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: PanelApp Australia, Laboratory for Molecular Medicine, Labcorp Genetics (formerly Invitae), G2P, Genomics England PanelApp, Ambry Genetics
lymphangioleiomyomatosis
Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
tuberous sclerosis complex
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

TSC2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -7 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.1934292).

BP6

Variant 16-2072880-G-A is Benign according to our data. Variant chr16-2072880-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 535887.

BS2

High AC in GnomAdExome4 at 10 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TSC2	NM_000548.5 link	c.2252G>A	p.Arg751Gln	missense_variant	Exon 21 of 42	ENST00000219476.9	NP_000539.2	P49815-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TSC2	ENST00000219476.9 link	c.2252G>A	p.Arg751Gln	missense_variant	Exon 21 of 42	5	NM_000548.5	ENSP00000219476.3		P49815-1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152236

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00000797

AC:

AN:

250910

AF XY:

0.00000736

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000578

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000684

AC:

AN:

1461216

Hom.:

Cov.:

AF XY:

0.00000825

AC XY:

AN XY:

726874

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.0000447

AC:

AN:

44720

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.0000252

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86254

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52772

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

0.00000540

AC:

AN:

1112004

Other (OTH)

AF:

0.0000166

AC:

AN:

60384

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.465

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152236

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74382

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41460

American (AMR)

AF:

0.0000654

AC:

AN:

15284

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5194

South Asian (SAS)

AF:

0.00

AC:

AN:

4838

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10626

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68048

Other (OTH)

AF:

0.00

AC:

AN:

2088

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.0000936

Hom.:

Bravo

AF:

0.0000113

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:4Benign:4

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Tuberous sclerosis 2

Benign:3

Oct 24, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Nov 07, 2021

Genome-Nilou Lab

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

May 25, 2020

Victorian Clinical Genetics Services, Murdoch Childrens Research Institute

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Based on the classification scheme VCGS_Germline_v1.1.1, this variant is classified as Likely benign. Following criteria are met: 0102 - Loss-of-function is a known mechanism of disease for this gene. Both missense and premature termination codon variants have been shown to affect protein function (ClinVar; PMID 11741832; 18302728) (N) 0107 - This gene is known to be associated with autosomal dominant disease. (N) 0200 - Variant is predicted to result in a missense amino acid change from an arginine to a glutamine (exon 21). (N) 0251 - Variant is heterozygous. (N) 0302 - Variant is present in gnomAD <0.001 for a dominant condition (2 heterozygotes, 0 homozygotes). (P) 0503 - Missense variant consistently predicted to be tolerated or not conserved in mammals with a minor amino acid change. (B) 0600 - Variant is located in an annotated domain or motif (Tuberin domain). (N) 0705 - No comparable variants have previous evidence for pathogenicity. (N) 0804 - Variant is present at a low frequency in the population and has previously been described as variant of uncertain significance in multiple cases (ClinVar; LOVD TSC2 database; PMID 31586081) (P) 0905 - No segregation evidence has been identified for this variant. (N) 1007 - No published functional evidence has been identified for this variant. (N) 1208 - Inheritance information for this variant is not currently available. (N) Legend: (P) - Pathogenic, (N) - Neutral, (B) - Benign -

not specified

Uncertain:1

Jan 02, 2025

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: TSC2 c.2252G>A (p.Arg751Gln) results in a conservative amino acid change in the encoded protein sequence. Five of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 8e-06 in 250910 control chromosomes (gnomAD). The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. c.2252G>A has been reported in the literature in at least one individual affected with Tuberous Sclerosis Complex (Ni_2019). These report(s) do not provide unequivocal conclusions about association of the variant with Tuberous Sclerosis Complex. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publication have been ascertained in the context of this evaluation (PMID: 31586081). ClinVar contains an entry for this variant (Variation ID: 535887). Based on the evidence outlined above, the variant was classified as uncertain significance. -

Lymphangiomyomatosis;C1846385:Isolated focal cortical dysplasia type II;C1860707:Tuberous sclerosis 2

Uncertain:1

Oct 31, 2018

Fulgent Genetics, Fulgent Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

TSC2-related disorder

Uncertain:1

Jun 17, 2024

PreventionGenetics, part of Exact Sciences

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:clinical testing

The TSC2 c.2252G>A variant is predicted to result in the amino acid substitution p.Arg751Gln. This variant has been reported in an individual with renal angiomyolipoma associated with the tuberous sclerosis complex (Table 2. Ni et al. 2019. PubMed ID: 31586081). This variant is reported in 0.0058% of alleles in individuals of Latino descent in gnomAD. This variant has conflicting interpretations ranging from benign to uncertain significance in ClinVar (https://www.ncbi.nlm.nih.gov/clinvar/variation/535887/). 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

Jul 05, 2023

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The p.R751Q variant (also known as c.2252G>A), located in coding exon 20 of the TSC2 gene, results from a G to A substitution at nucleotide position 2252. The arginine at codon 751 is replaced by glutamine, an amino acid with highly similar properties. In one study, this alteration was detected in 1/47 Chinese patients with renal angiomyolipoma associated with tuberous sclerosis complex (Ni J et al. Sci Rep, 2019 10;9:14337). 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. -

not provided

Benign:1

Jun 14, 2021

GeneDx

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant is associated with the following publications: (PMID: 31586081, 18466115) -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.080

BayesDel_addAF

Uncertain

0.14

BayesDel_noAF

Uncertain

-0.040

CADD

Uncertain

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.42

T;.;.;.;.;.;.;.;.;.;.;.;T;.;T

Eigen

Benign

-0.088

Eigen_PC

Benign

0.13

FATHMM_MKL

Benign

0.76

LIST_S2

Pathogenic

0.97

D;D;D;D;D;D;D;D;D;D;D;D;D;D;D

M_CAP

Benign

0.027

MetaRNN

Benign

0.19

T;T;T;T;T;T;T;T;T;T;T;T;T;T;T

MetaSVM

Benign

-0.73

MutationAssessor

Benign

0.0

N;.;.;.;N;N;.;.;.;N;.;N;.;.;.

PhyloP100

3.9

PrimateAI

Benign

0.31

PROVEAN

Benign

-0.56

N;.;.;N;.;N;.;.;N;N;.;.;.;.;N

REVEL

Uncertain

0.46

Sift

Benign

0.30

T;.;.;T;.;T;.;.;T;T;.;.;.;.;T

Sift4G

Benign

0.35

T;.;.;T;.;T;.;.;T;T;.;.;.;.;T

Polyphen

0.69

P;.;.;.;P;B;.;.;P;B;.;.;.;.;.

Vest4

0.42

MutPred

0.41

Loss of methylation at R751 (P = 0.0386);Loss of methylation at R751 (P = 0.0386);Loss of methylation at R751 (P = 0.0386);.;Loss of methylation at R751 (P = 0.0386);Loss of methylation at R751 (P = 0.0386);Loss of methylation at R751 (P = 0.0386);Loss of methylation at R751 (P = 0.0386);.;Loss of methylation at R751 (P = 0.0386);Loss of methylation at R751 (P = 0.0386);Loss of methylation at R751 (P = 0.0386);Loss of methylation at R751 (P = 0.0386);Loss of methylation at R751 (P = 0.0386);.;

MVP

0.84

ClinPred

0.21

GERP RS

4.6

Varity_R

0.036

gMVP

0.12

Mutation Taster

=95/5

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

Details are displayed if max score is > 0.2

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over