Genetic Variant TSC2:p.Met50Val (chr16-2050409-A-G) – ACMG Classification: Benign (-7 pts)

Variant summary

Our verdict is Benign. The variant received -7 ACMG points: 2P and 9B. PVS1_ModerateBP6BS1BS2

The NM_001406675.1(TSC2):c.1A>G(p.Met1?) variant causes a start lost change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000291 in 1,613,904 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00018 ( 0 hom., cov: 30)

Exomes 𝑓: 0.000014 ( 0 hom. )

Consequence

TSC2
NM_001406675.1 start_lost

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:8

Conservation

PhyloP100: 0.744

Publications

13 publications found

Variant links:

Genes affected

TSC2 (HGNC:12363): (TSC complex subunit 2) This gene is a tumor suppressor gene that encodes the growth inhibitory protein tuberin. Tuberin interacts with hamartin to form the TSC protein complex which functions in the control of cell growth. This TSC protein complex negatively regulates mammalian target of rapamycin complex 1 (mTORC1) signaling which is a major regulator of anabolic cell growth. Mutations in this gene have been associated with tuberous sclerosis and lymphangioleiomyomatosis. [provided by RefSeq, May 2022]

TSC2 Gene-Disease associations (from GenCC):

tuberous sclerosis
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
tuberous sclerosis 2
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, G2P, Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine, Ambry Genetics
lymphangioleiomyomatosis
Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
tuberous sclerosis complex
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

TSC2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -7 ACMG points.

PVS1

Start lost variant, next in-frame start position is after 1 pathogenic variants. Next in-frame start position is after 11 codons. Genomic position: 2050439. Lost 0.006 part of the original CDS.

BP6

Variant 16-2050409-A-G is Benign according to our data. Variant chr16-2050409-A-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 237966.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.000177 (27/152246) while in subpopulation AFR AF = 0.000626 (26/41536). AF 95% confidence interval is 0.000438. There are 0 homozygotes in GnomAd4. There are 14 alleles in the male GnomAd4 subpopulation. Median coverage is 30. This position passed quality control check.

BS2

High AC in GnomAd4 at 27 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001406675.1. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
TSC2	NM_000548.5	MANE Select	c.148A>G	p.Met50Val	missense	Exon 3 of 42	NP_000539.2	P49815-1
TSC2	NM_001406675.1		c.1A>G	p.Met1?	start_lost	Exon 2 of 40	NP_001393604.1
TSC2	NM_001406676.1		c.1A>G	p.Met1?	start_lost	Exon 2 of 40	NP_001393605.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
TSC2	ENST00000219476.9	TSL:5 MANE Select	c.148A>G	p.Met50Val	missense	Exon 3 of 42	ENSP00000219476.3	P49815-1
TSC2	ENST00000350773.9	TSL:1	c.148A>G	p.Met50Val	missense	Exon 3 of 41	ENSP00000344383.4	P49815-4
TSC2	ENST00000401874.7	TSL:1	c.148A>G	p.Met50Val	missense	Exon 3 of 40	ENSP00000384468.2	P49815-5

Frequencies

GnomAD3 genomes

AF:

0.000151

AC:

AN:

152128

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000531

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000358

AC:

AN:

251064

AF XY:

0.0000221

show subpopulations

Gnomad AFR exome

AF:

0.000493

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000882

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000137

AC:

AN:

1461658

Hom.:

Cov.:

AF XY:

0.0000165

AC XY:

AN XY:

727122

show subpopulations

African (AFR)

AF:

0.000448

AC:

AN:

33476

American (AMR)

AF:

0.00

AC:

AN:

44718

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26132

East Asian (EAS)

AF:

0.00

AC:

AN:

39694

South Asian (SAS)

AF:

0.00

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53328

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

0.00000270

AC:

AN:

1111906

Other (OTH)

AF:

0.0000331

AC:

AN:

60380

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.487

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000177

AC:

AN:

152246

Hom.:

Cov.:

AF XY:

0.000188

AC XY:

AN XY:

74442

show subpopulations

African (AFR)

AF:

0.000626

AC:

AN:

41536

American (AMR)

AF:

0.00

AC:

AN:

15274

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5186

South Asian (SAS)

AF:

0.00

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10612

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

68020

Other (OTH)

AF:

0.00

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.510

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000646

Hom.:

Bravo

AF:

0.000128

ESP6500AA

AF:

0.000682

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000494

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

ClinVar submissions

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

Tuberous sclerosis 2 (3)

not provided (2)

Hereditary cancer-predisposing syndrome (1)

Hypertrophic cardiomyopathy 7 (1)

not specified (1)

Tuberous sclerosis syndrome (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.042

BayesDel_addAF

Benign

-0.40

BayesDel_noAF

Benign

-0.44

CADD

Benign

8.4

(source)

DANN

Benign

0.47

DEOGEN2

Benign

0.35

Eigen

Benign

-0.99

Eigen_PC

Benign

-0.89

FATHMM_MKL

Benign

0.021

LIST_S2

Benign

0.60

M_CAP

Uncertain

0.16

MetaRNN

Benign

0.013

MetaSVM

Benign

-0.85

MutationAssessor

Benign

0.0

PhyloP100

0.74

PrimateAI

Benign

0.32

PROVEAN

Benign

0.17

REVEL

Benign

0.091

Sift

Benign

0.64

Sift4G

Benign

0.70

Polyphen

0.0

Vest4

0.13

MVP

0.25

ClinPred

0.012

GERP RS

2.6

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.025

gMVP

0.092

Mutation Taster

=15/185

disease causing

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

Splicevardb

2.0

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over