9-132902655-G-C

Variant names:

• chr9-132902655-G-C
• NM_000368.5:c.2341C>G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 4P and 1B. PM2 PM5 BP4

The NM_000368.5(TSC1):​c.2341C>G​(p.Gln781Glu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,864 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. Q781K) has been classified as Pathogenic.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: TSC1 NM_000368.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 9.48

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr9-132902655-G-T is described in Lovd as [Pathogenic].
• BP4: Computational evidence support a benign effect (MetaRNN=0.37841755).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TSC1	NM_000368.5	c.2341C>G	p.Gln781Glu	missense_variant	Exon 18 of 23	ENST00000298552.9	NP_000359.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TSC1	ENST00000298552.9	c.2341C>G	p.Gln781Glu	missense_variant	Exon 18 of 23	1	NM_000368.5	ENSP00000298552.3
TSC1	ENST00000490179.4	c.2341C>G	p.Gln781Glu	missense_variant	Exon 19 of 24	3		ENSP00000495533.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461864 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727228

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Pathogenic	0.17	D
BayesDel_noAF	Uncertain	0.010
CADD	Pathogenic	27
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.47	T;.;T;.;.;T;.;T;.;.;.
Eigen	Pathogenic	0.71
Eigen_PC	Pathogenic	0.75
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.94	.;D;D;D;D;.;.;.;D;D;.
M_CAP	Uncertain	0.089	D
MetaRNN	Benign	0.38	T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Uncertain	0.11	D
MutationAssessor	Uncertain	2.0	M;.;M;.;.;M;.;M;.;.;.
PrimateAI	Uncertain	0.58	T
PROVEAN	Benign	-1.2	N;N;N;.;.;.;.;.;.;.;.
REVEL	Uncertain	0.41
Sift	Uncertain	0.029	D;D;D;.;.;.;.;.;.;.;.
Sift4G	Benign	0.18	T;T;T;.;.;.;.;.;.;.;.
Polyphen		0.99	D;.;D;.;.;D;.;D;.;.;.
Vest4		0.74
MutPred		0.12		Loss of MoRF binding (P = 0.0514);.;Loss of MoRF binding (P = 0.0514);.;.;Loss of MoRF binding (P = 0.0514);.;Loss of MoRF binding (P = 0.0514);.;.;.;
MVP		0.79
MPC		0.64
ClinPred		0.80	D
GERP RS		5.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.53
gMVP		0.22

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr9-135778042;