rs118203753

Variant names:

• chr9-132896408-C-A
• rs118203753
• NM_000368.5:c.3322G>T

Your query was ambiguous. Multiple possible variants found:

• chr9-132896408-C-A
• chr9-132896408-C-G
• chr9-132896408-C-T

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_000368.5(TSC1):​c.3322G>T​(p.Gly1108Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 17/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G1108S) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TSC1 NM_000368.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: -0.651
• Publications: 5 publications found

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

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.04425481).

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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TSC1	NM_000368.5	MANE Select	c.3322G>T	p.Gly1108Cys	missense	Exon 23 of 23	NP_000359.1
	TSC1	NM_001406592.1		c.3322G>T	p.Gly1108Cys	missense	Exon 23 of 23	NP_001393521.1
	TSC1	NM_001406593.1		c.3322G>T	p.Gly1108Cys	missense	Exon 23 of 23	NP_001393522.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TSC1	ENST00000298552.9	TSL:1 MANE Select	c.3322G>T	p.Gly1108Cys	missense	Exon 23 of 23	ENSP00000298552.3
	TSC1	ENST00000490179.4	TSL:3	c.3322G>T	p.Gly1108Cys	missense	Exon 24 of 24	ENSP00000495533.2
	TSC1	ENST00000643875.1		c.3322G>T	p.Gly1108Cys	missense	Exon 23 of 23	ENSP00000495158.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions as Germline

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	1	-	Hereditary cancer-predisposing syndrome (1)
-	1	-	Tuberous sclerosis 1 (1)
-	1	-	Tuberous sclerosis syndrome (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.084
BayesDel_addAF	Benign	-0.13	T
BayesDel_noAF	Benign	-0.42
CADD	Benign	13
DANN	Benign	0.90
DEOGEN2	Benign	0.36	T
Eigen	Benign	-0.90
Eigen_PC	Benign	-0.97
FATHMM_MKL	Benign	0.34	N
LIST_S2	Benign	0.71	T
M_CAP	Benign	0.040	D
MetaRNN	Benign	0.044	T
MetaSVM	Benign	-0.74	T
MutationAssessor	Benign	1.3	L
PhyloP100		-0.65
PrimateAI	Benign	0.31	T
PROVEAN	Benign	-0.59	N
REVEL	Benign	0.27
Sift	Benign	0.18	T
Sift4G	Uncertain	0.038	D
Polyphen		0.0050	B
Vest4		0.14
MutPred		0.064		Loss of relative solvent accessibility (P = 0.0306)
MVP		0.24
MPC		0.55
ClinPred		0.088	T
GERP RS		-3.6
Varity_R		0.071
gMVP		0.16
Mutation Taster		=88/12	polymorphism

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

Other links and lift over

dbSNP: rs118203753; hg19: chr9-135771795;