chr9-132925604-A-T

Variant names:

• chr9-132925604-A-T
• NM_000368.5:c.346T>A

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PM5

The NM_000368.5(TSC1):​c.346T>A​(p.Leu116Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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. L116P) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 33)
• Consequence: TSC1 NM_000368.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.04

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 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr9-132925602-TAA-TGG is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TSC1	NM_000368.5	c.346T>A	p.Leu116Ile	missense_variant	Exon 5 of 23	ENST00000298552.9	NP_000359.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TSC1	ENST00000298552.9	c.346T>A	p.Leu116Ile	missense_variant	Exon 5 of 23	1	NM_000368.5	ENSP00000298552.3
TSC1	ENST00000490179.4	c.346T>A	p.Leu116Ile	missense_variant	Exon 6 of 24	3		ENSP00000495533.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.16
BayesDel_addAF	Pathogenic	0.16	D
BayesDel_noAF	Uncertain	0.0
CADD	Benign	21
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.46	T;T;.;T;.;T;.;.;.;.;.;.;.;T;.;.
Eigen	Benign	0.13
Eigen_PC	Benign	0.013
FATHMM_MKL	Uncertain	0.87	D
LIST_S2	Uncertain	0.96	.;D;D;.;.;.;D;D;.;.;D;D;D;D;D;D
M_CAP	Benign	0.063	D
MetaRNN	Uncertain	0.51	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Benign	-0.41	T
MutationAssessor	Uncertain	2.5	M;M;.;M;.;M;.;.;.;.;.;.;.;.;.;.
PrimateAI	Uncertain	0.76	T
PROVEAN	Benign	-0.65	N;N;.;.;.;.;.;.;.;.;.;.;.;N;.;.
REVEL	Uncertain	0.46
Sift	Benign	0.063	T;T;.;.;.;.;.;.;.;.;.;.;.;T;.;.
Sift4G	Uncertain	0.016	D;D;.;.;.;.;.;.;.;.;.;.;.;D;.;.
Polyphen		0.93	P;P;.;P;.;P;.;.;D;D;D;.;.;D;.;.
Vest4		0.77
MutPred		0.68		Loss of ubiquitination at K121 (P = 0.0896);Loss of ubiquitination at K121 (P = 0.0896);Loss of ubiquitination at K121 (P = 0.0896);Loss of ubiquitination at K121 (P = 0.0896);Loss of ubiquitination at K121 (P = 0.0896);Loss of ubiquitination at K121 (P = 0.0896);Loss of ubiquitination at K121 (P = 0.0896);Loss of ubiquitination at K121 (P = 0.0896);Loss of ubiquitination at K121 (P = 0.0896);Loss of ubiquitination at K121 (P = 0.0896);Loss of ubiquitination at K121 (P = 0.0896);Loss of ubiquitination at K121 (P = 0.0896);Loss of ubiquitination at K121 (P = 0.0896);Loss of ubiquitination at K121 (P = 0.0896);Loss of ubiquitination at K121 (P = 0.0896);Loss of ubiquitination at K121 (P = 0.0896);
MVP		0.51
MPC		1.5
ClinPred		0.97	D
GERP RS		-3.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0
Varity_R		0.093
gMVP		0.29

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: chr9-135800991;