NM_000368.5:c.1959dupA

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The NM_000368.5(TSC1):c.1959dupA(p.Gln654ThrfsTer34) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,876 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

TSC1
NM_000368.5 frameshift

Scores

Not classified

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:8O:1

Conservation

PhyloP100: -0.108

Publications

4 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: Pathogenic. The variant received 18 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 9-132905618-G-GT is Pathogenic according to our data. Variant chr9-132905618-G-GT is described in ClinVar as Pathogenic. ClinVar VariationId is 48857.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000368.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
TSC1	NM_000368.5	MANE Select	c.1959dupA	p.Gln654ThrfsTer34	frameshift	Exon 15 of 23	NP_000359.1
TSC1	NM_001406592.1		c.1959dupA	p.Gln654ThrfsTer34	frameshift	Exon 15 of 23	NP_001393521.1
TSC1	NM_001406593.1		c.1959dupA	p.Gln654ThrfsTer34	frameshift	Exon 15 of 23	NP_001393522.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
TSC1	ENST00000298552.9	TSL:1 MANE Select	c.1959dupA	p.Gln654ThrfsTer34	frameshift	Exon 15 of 23	ENSP00000298552.3
TSC1	ENST00000490179.4	TSL:3	c.1959dupA	p.Gln654ThrfsTer34	frameshift	Exon 16 of 24	ENSP00000495533.2
TSC1	ENST00000643875.1		c.1959dupA	p.Gln654ThrfsTer34	frameshift	Exon 15 of 23	ENSP00000495158.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000398

AC:

AN:

251330

AF XY:

0.00

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

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:

6.84e-7

AC:

AN:

1461876

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727236

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.0000224

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86254

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5756

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1112012

Other (OTH)

AF:

0.00

AC:

AN:

60394

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

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

Cov.:

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:8Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Tuberous sclerosis 1

Pathogenic:7

Jan 13, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

For these reasons, this variant has been classified as Pathogenic. Loss-of-function variants in TSC1 are known to be pathogenic (PMID: 10227394, 17304050). This variant has been observed in¬†individuals affected with tuberous sclerosis¬†complex (PMID: 16981987) and in the Leiden Open-source Variation Database (PMID: 21520333). This variant is not present in population databases (ExAC no frequency). This sequence change creates a premature translational stop signal (p.Gln654Thrfs*34) in the TSC1 gene. It is expected to result in an absent or disrupted protein product.

Aug 29, 2012

Athena Diagnostics

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Nov 07, 2021

Genome-Nilou Lab

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Sep 02, 2025

Institute of Immunology and Genetics Kaiserslautern

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

ACMG Criteria: PVS1, PM1, PM2, PP5; Variant was found in heterozygous state.

Nov 03, 2025

Department of Molecular Genetics, Istishari Arab Hospital

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The TSC1 variant c.1959dup, p.Gln654Thrfs*34 creates a shift in the reading frame at position 654, introducing a premature stop codon 34 amino acids downstream. This is predicted to result in a loss or disruption of normal protein function through non-sense mediated decay (NMD) or protein truncation. This variant is observed at an extremely low frequency in the gnomAD v4.1.0 dataset (total allele frequency: <0.001%) and has previously been reported in the literature as disease-causing in patients with autosomal dominant Tuberous sclerosis-1 (PMID: 17304050, 16981987, 10227394). It is classified as pathogenic (class 1) according to the recommendations of ACMG/AMP/ClinGen SVI guidelines.

Juno Genomics, Hangzhou Juno Genomics, Inc

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Absent from controls (or at extremely low frequency if recessive) in Genome Aggregation Database, Exome Sequencing Project, 1000 Genomes Project, or Exome Aggregation Consortium.;Null variant in a gene where loss of function (LOF) is a known mechanism of disease.;The prevalence of the variant in affected individuals is significantly increased compared to the prevalence in controls.;Patient's phenotype or family history is highly specific for a disease with a single genetic etiology.

Mar 16, 2022

MGZ Medical Genetics Center

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Hereditary cancer-predisposing syndrome

Pathogenic:1

Feb 27, 2025

Ambry Genetics

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.1959dupA pathogenic mutation, located in coding exon 13 of the TSC1 gene, results from a duplication of A at nucleotide position 1959, causing a translational frameshift with a predicted alternate stop codon (p.Q654Tfs*34). This alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. As such, this alteration is interpreted as a disease-causing mutation.

Tuberous sclerosis syndrome

Other:1

Tuberous sclerosis database (TSC1)

Significance:not provided

Review Status:no classification provided

Collection Method:curation

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

PhyloP100

-0.11

Mutation Taster

=0/200

disease causing (ClinVar)

(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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over