chr9-132911475-C-A

Variant names:

• chr9-132911475-C-A
• rs397514808
• NM_000368.5:c.1007G>T

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001406629.1(TSC1):​c.-87G>T variant causes a 5 prime UTR premature start codon gain change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: TSC1 NM_001406629.1 5_prime_UTR_premature_start_codon_gain
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.57
• Publications: 0 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, Labcorp Genetics (formerly Invitae), G2P, PanelApp Australia, Genomics England PanelApp
• 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: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001406629.1. 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.1007G>T	p.Arg336Leu	missense	Exon 10 of 23	NP_000359.1
	TSC1	NM_001406629.1		c.-87G>T		5_prime_UTR_premature_start_codon_gain	Exon 9 of 22	NP_001393558.1
	TSC1	NM_001406630.1		c.-87G>T		5_prime_UTR_premature_start_codon_gain	Exon 10 of 23	NP_001393559.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TSC1	ENST00000298552.9	TSL:1 MANE Select	c.1007G>T	p.Arg336Leu	missense	Exon 10 of 23	ENSP00000298552.3
	TSC1	ENST00000490179.4	TSL:3	c.1007G>T	p.Arg336Leu	missense	Exon 11 of 24	ENSP00000495533.2
	TSC1	ENST00000403810.6	TSL:1	c.1007G>T	p.Arg336Leu	missense	Exon 10 of 10	ENSP00000386093.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 31

ClinVar

ClinVar submissions as Germline

Significance: Uncertain significance

Revision: criteria provided, single submitter

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

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Pathogenic	0.27	D
BayesDel_noAF	Pathogenic	0.15
CADD	Benign	22
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.53	D
Eigen	Benign	0.018
Eigen_PC	Benign	0.15
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Benign	0.85	T
M_CAP	Uncertain	0.13	D
MetaRNN	Uncertain	0.48	T
MetaSVM	Uncertain	0.19	D
MutationAssessor	Benign	1.8	L
PhyloP100		1.6
PrimateAI	Benign	0.32	T
PROVEAN	Benign	-1.4	N
REVEL	Uncertain	0.60
Sift	Benign	0.055	T
Sift4G	Benign	0.12	T
Polyphen		0.011	B
Vest4		0.60
MutPred		0.60		Loss of phosphorylation at T339 (P = 0.0546)
MVP		0.92
MPC		0.63
ClinPred		0.65	D
GERP RS		5.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.11
gMVP		0.33
Mutation Taster		=81/19	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs397514808; hg19: chr9-135786862;