9-132897553-C-T

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BP4_ModerateBP6BS2_Supporting

The NM_000368.5(TSC1):c.2683G>A(p.Val895Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000386 in 1,555,712 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict 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. V895G) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0000070 ( 0 hom., cov: 31)

Exomes 𝑓: 0.0000035 ( 0 hom. )

Consequence

TSC1
NM_000368.5 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:1

Conservation

PhyloP100: 1.81

Publications

1 publications found

Variant links:

Genes affected

TSC1 (HGNC:12362): (TSC complex subunit 1) This gene is a tumor suppressor gene that encodes the growth inhibitory protein hamartin. The encoded protein interacts with and stabilizes the GTPase activating protein tuberin. This hamartin-tuberin complex negatively regulates mammalian target of rapamycin complex 1 (mTORC1) signaling which is a major regulator of anabolic cell growth. This protein also functions as a co-chaperone for Hsp90 that inhibits its ATPase activity. This protein functions as a facilitator of Hsp90-mediated folding of kinase and non-kinase clients, including TSC2 and thereby preventing their ubiquitination and proteasomal degradation. Mutations in this gene have been associated with tuberous sclerosis and lymphangioleiomyomatosis. [provided by RefSeq, May 2022]

TSC1 Gene-Disease associations (from GenCC):

tuberous sclerosis
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
tuberous sclerosis 1
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, PanelApp Australia, Genomics England PanelApp, G2P, Labcorp Genetics (formerly Invitae)
lung lymphangioleiomyomatosis
Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
tuberous sclerosis complex
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

TSC1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -4 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.08602604).

BP6

Variant 9-132897553-C-T is Benign according to our data. Variant chr9-132897553-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 411268.

BS2

High AC in GnomAdExome4 at 5 AD gene. Variant has AC lower than other variant known as pathogenic in the gene, so the strength is limited to Supporting.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TSC1	NM_000368.5 link	c.2683G>A	p.Val895Ile	missense_variant	Exon 21 of 23	ENST00000298552.9	NP_000359.1	Q92574-1Q86WV8X5D9D2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TSC1	ENST00000298552.9 link	c.2683G>A	p.Val895Ile	missense_variant	Exon 21 of 23	1	NM_000368.5	ENSP00000298552.3		Q92574-1
TSC1	ENST00000490179.4 link	c.2683G>A	p.Val895Ile	missense_variant	Exon 22 of 24	3		ENSP00000495533.2		A0A2R8Y6S8

Frequencies

GnomAD3 genomes

AF:

0.00000703

AC:

AN:

142322

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000236

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00000404

AC:

AN:

247830

AF XY:

0.00000746

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

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:

0.00000354

AC:

AN:

1413308

Hom.:

Cov.:

AF XY:

0.00000285

AC XY:

AN XY:

702798

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

32064

American (AMR)

AF:

0.00

AC:

AN:

42658

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

23832

East Asian (EAS)

AF:

0.00

AC:

AN:

35818

South Asian (SAS)

AF:

0.0000590

AC:

AN:

84690

European-Finnish (FIN)

AF:

0.00

AC:

AN:

50164

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5508

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1081616

Other (OTH)

AF:

0.00

AC:

AN:

56958

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.415

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:

0.00000702

AC:

AN:

142404

Hom.:

Cov.:

AF XY:

0.0000146

AC XY:

AN XY:

68348

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

38988

American (AMR)

AF:

0.00

AC:

AN:

13658

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3420

East Asian (EAS)

AF:

0.00

AC:

AN:

4556

South Asian (SAS)

AF:

0.000236

AC:

AN:

4232

European-Finnish (FIN)

AF:

0.00

AC:

AN:

8082

Middle Eastern (MID)

AF:

0.00

AC:

AN:

270

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

66316

Other (OTH)

AF:

0.00

AC:

AN:

1984

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

ExAC

AF:

0.00000824

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Tuberous sclerosis 1

Uncertain:1Benign:1

Oct 31, 2023

Clinical Genomics Laboratory, Washington University in St. Louis

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The TSC1 c.2683G>A (p.Val895Ile) variant was identified at near heterozygous allelic fraction of 48%, a frequency which may be consistent with it being of germline origin. To our knowledge, this variant has not been reported in the medical literature and is only observed on 1/142,322 alleles in the general population (gnomAD v3.1.2), indicating that it is not a common variant. The variant has been reported in the ClinVar database as a variant of uncertain significance by one submitter and a likely benign variant by another submitter (ClinVar Variation ID: 411268). Computational predictors suggest that the variant does not impact TSC1 function. Due to limited information, and based on the ACMG/AMP guidelines for variant interpretation (Richards S et al., PMID: 25741868), the clinical significance of the TSC1 c.2683G>A (p.Val895Ile) variant is uncertain at this time. -

Aug 27, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Hereditary cancer-predisposing syndrome

Uncertain:1

Jun 06, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The p.V895I variant (also known as c.2683G>A), located in coding exon 19 of the TSC1 gene, results from a G to A substitution at nucleotide position 2683. The valine at codon 895 is replaced by isoleucine, an amino acid with highly similar properties. This amino acid position is not well conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Based on the available evidence, the clinical significance of this variant remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.074

BayesDel_addAF

Benign

-0.20

BayesDel_noAF

Benign

-0.42

CADD

Benign

(source)

DANN

Uncertain

0.98

DEOGEN2

Benign

0.30

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

Eigen

Benign

-0.25

Eigen_PC

Benign

-0.13

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Benign

0.82

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

M_CAP

Benign

0.031

MetaRNN

Benign

0.086

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

MetaSVM

Benign

-0.54

MutationAssessor

Benign

1.2

L;.;L;.;.;L;.;L;.;.;.

PhyloP100

1.8

PrimateAI

Benign

0.38

PROVEAN

Benign

0.38

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

REVEL

Benign

0.15

Sift

Benign

0.070

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

Sift4G

Benign

0.39

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

Polyphen

0.13

B;.;B;.;.;B;.;B;.;.;.

Vest4

0.34

MutPred

0.22

Gain of methylation at K890 (P = 0.1433);.;Gain of methylation at K890 (P = 0.1433);.;.;Gain of methylation at K890 (P = 0.1433);.;Gain of methylation at K890 (P = 0.1433);.;.;.;

MVP

0.37

MPC

0.42

ClinPred

0.13

GERP RS

2.3

Varity_R

0.091

gMVP

0.038

Mutation Taster

=91/9

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

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