rs772038670

chr9-132902674-C-Achr9-132902674-C-Gchr9-132902674-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_000368.5(TSC1):c.2322G>T(p.Lys774Asn) 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. 14/21 in silico tools predict 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. K774T) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TSC1 NM_000368.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.868

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 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, TSC1
• BP4: Computational evidence support a benign effect (MetaRNN=0.118435025).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TSC1	NM_000368.5	c.2322G>T	p.Lys774Asn	missense_variant	18/23	ENST00000298552.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TSC1	ENST00000298552.9	c.2322G>T	p.Lys774Asn	missense_variant	18/23	1	NM_000368.5	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.17
BayesDel_addAF	Benign	-0.14	T
BayesDel_noAF	Benign	-0.44
Cadd	Benign	18
Dann	Uncertain	0.99
DEOGEN2	Benign	0.40	T;.;T;.;.;T;.;T;.;.;.
Eigen	Benign	-0.61
Eigen_PC	Benign	-0.45
FATHMM_MKL	Uncertain	0.84	D
M_CAP	Uncertain	0.10	D
MetaRNN	Benign	0.12	T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.84	T
MutationAssessor	Benign	0.55	N;.;N;.;.;N;.;N;.;.;.
MutationTaster	Benign	1.0	D;N;N;N
PrimateAI	Benign	0.30	T
PROVEAN	Benign	-0.93	N;N;N;.;.;.;.;.;.;.;.
REVEL	Benign	0.26
Sift	Uncertain	0.027	D;T;D;.;.;.;.;.;.;.;.
Sift4G	Benign	0.11	T;T;T;.;.;.;.;.;.;.;.
Polyphen		0.054	B;.;B;.;.;B;.;B;.;.;.
Vest4		0.43
MutPred		0.090		Loss of ubiquitination at K774 (P = 0.0118);.;Loss of ubiquitination at K774 (P = 0.0118);.;.;Loss of ubiquitination at K774 (P = 0.0118);.;Loss of ubiquitination at K774 (P = 0.0118);.;.;.;
MVP		0.67
MPC		0.60
ClinPred		0.51	D
GERP RS		2.6
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.14
gMVP		0.097

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.13		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: chr9-135778061;