chr9-132911494-G-C

Variant names:

• chr9-132911494-G-C
• rs1060503222
• NM_000368.5:c.988C>G

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_000368.5(TSC1):​c.988C>G​(p.Leu330Val) 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. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L330R) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 31)
• Consequence: TSC1 NM_000368.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.95
• 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, 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: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

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

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TSC1	NM_000368.5	MANE Select	c.988C>G	p.Leu330Val	missense	Exon 10 of 23	NP_000359.1
	TSC1	NM_001406629.1		c.-106C>G		5_prime_UTR_premature_start_codon_gain	Exon 9 of 22	NP_001393558.1
	TSC1	NM_001406630.1		c.-106C>G		5_prime_UTR_premature_start_codon_gain	Exon 10 of 23	NP_001393559.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TSC1	ENST00000298552.9	TSL:1 MANE Select	c.988C>G	p.Leu330Val	missense	Exon 10 of 23	ENSP00000298552.3
	TSC1	ENST00000490179.4	TSL:3	c.988C>G	p.Leu330Val	missense	Exon 11 of 24	ENSP00000495533.2
	TSC1	ENST00000403810.6	TSL:1	c.988C>G	p.Leu330Val	missense	Exon 10 of 10	ENSP00000386093.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.066
BayesDel_addAF	Uncertain	0.13	D
BayesDel_noAF	Uncertain	-0.050
CADD	Benign	23
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.44	T
Eigen	Benign	0.063
Eigen_PC	Benign	0.16
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.88	D
M_CAP	Benign	0.045	D
MetaRNN	Benign	0.33	T
MetaSVM	Uncertain	-0.088	T
MutationAssessor	Uncertain	2.3	M
PhyloP100		2.0
PrimateAI	Benign	0.33	T
PROVEAN	Benign	-0.14	N
REVEL	Uncertain	0.49
Sift	Benign	0.21	T
Sift4G	Benign	0.20	T
Polyphen		0.025	B
Vest4		0.43
MutPred		0.51		Loss of glycosylation at P333 (P = 0.1292)
MVP		0.71
MPC		0.53
ClinPred		0.32	T
GERP RS		4.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.038
gMVP		0.17
Mutation Taster		=94/6	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.84		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.84		Position offset: 1
DS_DL_spliceai		0.28		Position offset: -41

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

Other links and lift over

dbSNP: rs1060503222; hg19: chr9-135786881;