rs878854083

Variant names:

• chr16-2053360-T-C
• rs878854083
• NM_000548.5:c.244T>C

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_000548.5(TSC2):​c.244T>C​(p.Trp82Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: TSC2 NM_000548.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.78
• Publications: 0 publications found

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: PanelApp Australia, Laboratory for Molecular Medicine, Labcorp Genetics (formerly Invitae), G2P, Genomics England PanelApp, Ambry Genetics
• lymphangioleiomyomatosis

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
• tuberous sclerosis complex

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.96

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

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TSC2	NM_000548.5	MANE Select	c.244T>C	p.Trp82Arg	missense	Exon 4 of 42	NP_000539.2
	TSC2	NM_001406663.1		c.244T>C	p.Trp82Arg	missense	Exon 4 of 42	NP_001393592.1
	TSC2	NM_001114382.3		c.244T>C	p.Trp82Arg	missense	Exon 4 of 41	NP_001107854.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TSC2	ENST00000219476.9	TSL:5 MANE Select	c.244T>C	p.Trp82Arg	missense	Exon 4 of 42	ENSP00000219476.3
	TSC2	ENST00000350773.9	TSL:1	c.244T>C	p.Trp82Arg	missense	Exon 4 of 41	ENSP00000344383.4
	TSC2	ENST00000401874.7	TSL:1	c.244T>C	p.Trp82Arg	missense	Exon 4 of 40	ENSP00000384468.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1435108 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 711434

African (AFR) AF: 0.00 AC: 0 AN: 33016

American (AMR) AF: 0.00 AC: 0 AN: 41038

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25584

East Asian (EAS) AF: 0.00 AC: 0 AN: 38458

South Asian (SAS) AF: 0.00 AC: 0 AN: 81964

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 50756

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5090

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1099904

Other (OTH) AF: 0.00 AC: 0 AN: 59298

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Tuberous sclerosis 2 Uncertain:1

Dec 12, 2017

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with TSC2-related disease. ClinVar contains an entry for this variant (Variation ID: 237991). This variant is not present in population databases (ExAC no frequency). This sequence change replaces tryptophan with arginine at codon 82 of the TSC2 protein (p.Trp82Arg). The tryptophan residue is moderately conserved and there is a moderate physicochemical difference between tryptophan and arginine.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.97
BayesDel_addAF	Pathogenic	0.45	D
BayesDel_noAF	Pathogenic	0.41
CADD	Pathogenic	28
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.88	D
Eigen	Uncertain	0.64
Eigen_PC	Uncertain	0.58
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.90	D
M_CAP	Pathogenic	0.66	D
MetaRNN	Pathogenic	0.96	D
MetaSVM	Uncertain	0.75	D
MutationAssessor	Uncertain	2.5	M
PhyloP100		7.8
PrimateAI	Pathogenic	0.80	D
PROVEAN	Pathogenic	-12	D
REVEL	Pathogenic	0.93
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.0040	D
Polyphen		1.0	D
Vest4		0.97
MutPred		0.74		Gain of disorder (P = 0.0151)
MVP		0.96
ClinPred		1.0	D
GERP RS		4.8
PromoterAI		0.065	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.86
gMVP		0.91
Mutation Taster		=25/75	disease causing

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

Other links and lift over

dbSNP: rs878854083; hg19: chr16-2103361;