rs878854079

Variant names:

• chr16-2071879-T-A
• rs878854079
• NM_000548.5:c.2042T>A

Your query was ambiguous. Multiple possible variants found:

• chr16-2071879-T-A
• chr16-2071879-T-C
• chr16-2071879-T-G

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4 BS2

The NM_000548.5(TSC2):​c.2042T>A​(p.Leu681Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000346 in 1,445,068 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 Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L681P) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000035 (0 hom.)
• Consequence: TSC2 NM_000548.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 2.71
• Publications: 2 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: 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

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.35859782).
• BS2: High AC in GnomAdExome4 at 5 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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TSC2	NM_000548.5	MANE Select	c.2042T>A	p.Leu681Gln	missense	Exon 19 of 42	NP_000539.2	P49815-1
	TSC2	NM_001406663.1		c.2042T>A	p.Leu681Gln	missense	Exon 19 of 42	NP_001393592.1	A0A2R8Y6C9
	TSC2	NM_001114382.3		c.2042T>A	p.Leu681Gln	missense	Exon 19 of 41	NP_001107854.1	P49815-4

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TSC2	ENST00000219476.9	TSL:5 MANE Select	c.2042T>A	p.Leu681Gln	missense	Exon 19 of 42	ENSP00000219476.3	P49815-1
	TSC2	ENST00000350773.9	TSL:1	c.2042T>A	p.Leu681Gln	missense	Exon 19 of 41	ENSP00000344383.4	P49815-4
	TSC2	ENST00000401874.7	TSL:1	c.2042T>A	p.Leu681Gln	missense	Exon 19 of 40	ENSP00000384468.2	P49815-5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000346 AC: 5 AN: 1445068 Hom.: 0 Cov.: 33 AF XY: 0.00000279 AC XY: 2 AN XY: 717522

African (AFR) AF: 0.00 AC: 0 AN: 33112

American (AMR) AF: 0.00 AC: 0 AN: 42994

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25754

East Asian (EAS) AF: 0.00 AC: 0 AN: 38876

South Asian (SAS) AF: 0.00 AC: 0 AN: 83712

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 50620

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5686

European-Non Finnish (NFE) AF: 0.00000453 AC: 5 AN: 1104632

Other (OTH) AF: 0.00 AC: 0 AN: 59682

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	2	-	Tuberous sclerosis 2 (2)
-	1	-	Hereditary cancer-predisposing syndrome (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Pathogenic	0.20	D
BayesDel_noAF	Uncertain	0.040
CADD	Benign	18
DANN	Uncertain	0.97
DEOGEN2	Uncertain	0.68	D
Eigen	Benign	-0.57
Eigen_PC	Benign	-0.50
FATHMM_MKL	Benign	0.66	D
LIST_S2	Uncertain	0.94	D
M_CAP	Uncertain	0.27	D
MetaRNN	Benign	0.36	T
MetaSVM	Benign	-0.45	T
MutationAssessor	Benign	0.81	L
PhyloP100		2.7
PrimateAI	Uncertain	0.60	T
PROVEAN	Uncertain	-2.4	N
REVEL	Uncertain	0.55
Sift	Benign	0.044	D
Sift4G	Benign	0.074	T
Polyphen		0.0010	B
Vest4		0.49
MutPred		0.64		Loss of sheet (P = 0.0126)
MVP		0.98
ClinPred		0.39	T
GERP RS		4.4
Varity_R		0.29
gMVP		0.51
Mutation Taster		=89/11	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs878854079; hg19: chr16-2121880;