rs535397245

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 5P and 2B. PM1PM5PP2BP4_Moderate

The NM_000368.5(TSC1):c.670A>T(p.Met224Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000434 in 1,614,154 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. M224K) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000041 ( 0 hom. )

Consequence

TSC1
NM_000368.5 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:1

Conservation

PhyloP100: 3.24

Variant links:

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 3 ACMG points.

PM1

In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 2 benign, 14 uncertain in NM_000368.5

PM5

Other missense variant is known to change same aminoacid residue: Variant chr9-132921429-A-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 5104.Status of the report is criteria_provided_single_submitter, 1 stars.

PP2

Missense variant where missense usually causes diseases, TSC1

BP4

Computational evidence support a benign effect (MetaRNN=0.14012703).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TSC1	NM_000368.5 linkuse as main transcript	c.670A>T	p.Met224Leu	missense_variant	8/23	ENST00000298552.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TSC1	ENST00000298552.9 linkuse as main transcript	c.670A>T	p.Met224Leu	missense_variant	8/23	1	NM_000368.5	P4	Q92574-1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152204

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000119

AC:

AN:

251376

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135866

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.0000578

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000410

AC:

AN:

1461832

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727222

show subpopulations

Gnomad4 AFR exome

AF:

0.000119

Gnomad4 AMR exome

AF:

0.0000447

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

AF:

0.00000657

AC:

AN:

152322

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74472

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000227

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Tuberous sclerosis 1

Uncertain:1Benign:1

Likely benign, criteria provided, single submitter	clinical testing	Invitae	Nov 17, 2023	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Nov 07, 2021	- -

Lymphangiomyomatosis;C1846385:Isolated focal cortical dysplasia type II;C1854465:Tuberous sclerosis 1

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

May 19, 2022

- -

Hereditary cancer-predisposing syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 23, 2023

The p.M224L variant (also known as c.670A>T), located in coding exon 6 of the TSC1 gene, results from an A to T substitution at nucleotide position 670. The methionine at codon 224 is replaced by leucine, an amino acid with highly similar properties. This amino acid position is not well conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.22

BayesDel_addAF

Benign

-0.099

BayesDel_noAF

Benign

-0.20

Cadd

Benign

Dann

Benign

0.81

DEOGEN2

Benign

0.38

T;.;T;.;T;.;T;.;.;.;.;.;.;.;.;.;.;T;.;.

Eigen

Benign

-0.29

Eigen_PC

Benign

-0.070

FATHMM_MKL

Uncertain

0.93

M_CAP

Benign

0.018

MetaRNN

Benign

0.12

T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T

MetaSVM

Benign

-0.75

MutationAssessor

Benign

1.4

L;.;L;.;L;.;L;.;.;.;.;.;.;.;.;.;.;.;.;.

MutationTaster

Benign

0.97

D;D;D;D;D

PrimateAI

Uncertain

0.70

PROVEAN

Benign

1.0

N;N;N;.;.;.;.;.;.;.;.;.;.;.;.;.;.;N;.;.

REVEL

Benign

0.28

Sift

Benign

1.0

T;T;T;.;.;.;.;.;.;.;.;.;.;.;.;.;.;T;.;.

Sift4G

Benign

1.0

T;T;T;.;.;.;.;.;.;.;.;.;.;.;.;.;.;T;.;.

Polyphen

0.018

B;.;B;.;B;.;B;.;.;.;.;B;B;B;.;.;.;B;.;.

Vest4

0.40

MutPred

0.54

Loss of catalytic residue at V220 (P = 0.0628);.;Loss of catalytic residue at V220 (P = 0.0628);Loss of catalytic residue at V220 (P = 0.0628);Loss of catalytic residue at V220 (P = 0.0628);Loss of catalytic residue at V220 (P = 0.0628);Loss of catalytic residue at V220 (P = 0.0628);Loss of catalytic residue at V220 (P = 0.0628);Loss of catalytic residue at V220 (P = 0.0628);.;.;Loss of catalytic residue at V220 (P = 0.0628);Loss of catalytic residue at V220 (P = 0.0628);Loss of catalytic residue at V220 (P = 0.0628);Loss of catalytic residue at V220 (P = 0.0628);Loss of catalytic residue at V220 (P = 0.0628);.;Loss of catalytic residue at V220 (P = 0.0628);.;Loss of catalytic residue at V220 (P = 0.0628);

MVP

0.54

MPC

0.54

ClinPred

0.12

GERP RS

5.1

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.20

gMVP

0.49

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.050

Details are displayed if max score is > 0.2

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over