Genetic Variant TSC2:c.3814+56C>T (chr16-2081854-C-T) – ACMG Classification: Benign (-9 pts)

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_StrongBS1_SupportingBS2

The NM_000548.5(TSC2):c.3814+56C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000498 in 1,587,556 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 not provided (no stars).

Frequency

Genomes: 𝑓 0.00017 ( 0 hom., cov: 34)

Exomes 𝑓: 0.000037 ( 0 hom. )

Consequence

TSC2
NM_000548.5 intron

Scores

Clinical Significance

not provided no classification provided O:1

Conservation

PhyloP100: -0.199

Publications

1 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 -9 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.85).

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.000171 (26/152326) while in subpopulation AFR AF = 0.000529 (22/41570). AF 95% confidence interval is 0.000358. There are 0 homozygotes in GnomAd4. There are 8 alleles in the male GnomAd4 subpopulation. Median coverage is 34. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High AC in GnomAd4 at 26 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000548.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein	UniProt
TSC2	NM_000548.5	MANE Select	c.3814+56C>T	intron	N/A	NP_000539.2	P49815-1
TSC2	NM_001406663.1		c.3811+56C>T	intron	N/A	NP_001393592.1	A0A2R8Y6C9
TSC2	NM_001114382.3		c.3814+56C>T	intron	N/A	NP_001107854.1	P49815-4

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein	UniProt
TSC2	ENST00000219476.9	TSL:5 MANE Select	c.3814+56C>T	intron	N/A	ENSP00000219476.3	P49815-1
TSC2	ENST00000350773.9	TSL:1	c.3814+56C>T	intron	N/A	ENSP00000344383.4	P49815-4
TSC2	ENST00000401874.7	TSL:1	c.3682+56C>T	intron	N/A	ENSP00000384468.2	P49815-5

Frequencies

GnomAD3 genomes

AF:

0.000171

AC:

AN:

152208

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000531

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.0000941

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.0000369

AC:

AN:

1435230

Hom.:

Cov.:

AF XY:

0.0000323

AC XY:

AN XY:

712410

show subpopulations

African (AFR)

AF:

0.000367

AC:

AN:

32708

American (AMR)

AF:

0.00

AC:

AN:

41520

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25758

East Asian (EAS)

AF:

0.00

AC:

AN:

38028

South Asian (SAS)

AF:

0.00

AC:

AN:

83254

European-Finnish (FIN)

AF:

0.00

AC:

AN:

50022

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4170

European-Non Finnish (NFE)

AF:

0.0000336

AC:

AN:

1100466

Other (OTH)

AF:

0.0000674

AC:

AN:

59304

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.503

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:

0.000171

AC:

AN:

152326

Hom.:

Cov.:

AF XY:

0.000107

AC XY:

AN XY:

74490

show subpopulations

African (AFR)

AF:

0.000529

AC:

AN:

41570

American (AMR)

AF:

0.0000653

AC:

AN:

15312

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5182

South Asian (SAS)

AF:

0.00

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.0000941

AC:

AN:

10628

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000294

AC:

AN:

68014

Other (OTH)

AF:

0.00

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.494

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:

0.000108

Hom.:

Bravo

AF:

0.000174

ClinVar

ClinVar submissions

Significance:not provided

Revision:no classification provided

View on ClinVar

Pathogenic

VUS

Benign

Condition

Tuberous sclerosis syndrome (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.85

CADD

Benign

3.0

(source)

DANN

Benign

0.53

PhyloP100

-0.20

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

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

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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