16-2079663-A-C

Variant names:

• chr16-2079663-A-C
• rs775639244
• NM_000548.5:c.3391A>C

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 4P and 2B. PM2 PM5 BP4_Moderate

The NM_000548.5(TSC2):​c.3391A>C​(p.Met1131Leu) variant causes a missense change. The variant allele was found at a frequency of 0.000000695 in 1,438,176 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. M1131T) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 7.0e-7 (0 hom.)
• Consequence: TSC2 NM_000548.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 4.50
• Publications: 4 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: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr16-2079665-G-C is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 3777068.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP4: Computational evidence support a benign effect (MetaRNN=0.2107406).

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.3391A>C	p.Met1131Leu	missense	Exon 29 of 42	NP_000539.2	P49815-1
	TSC2	NM_001406663.1		c.3388A>C	p.Met1130Leu	missense	Exon 29 of 42	NP_001393592.1	A0A2R8Y6C9
	TSC2	NM_001114382.3		c.3391A>C	p.Met1131Leu	missense	Exon 29 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.3391A>C	p.Met1131Leu	missense	Exon 29 of 42	ENSP00000219476.3	P49815-1
	TSC2	ENST00000350773.9	TSL:1	c.3391A>C	p.Met1131Leu	missense	Exon 29 of 41	ENSP00000344383.4	P49815-4
	TSC2	ENST00000401874.7	TSL:1	c.3259A>C	p.Met1087Leu	missense	Exon 28 of 40	ENSP00000384468.2	P49815-5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00000484 AC: 1 AN: 206530 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000638

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 6.95e-7 AC: 1 AN: 1438176 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 713394

African (AFR) AF: 0.00 AC: 0 AN: 33144

American (AMR) AF: 0.00 AC: 0 AN: 41484

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25658

East Asian (EAS) AF: 0.0000258 AC: 1 AN: 38740

South Asian (SAS) AF: 0.00 AC: 0 AN: 83126

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 50206

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4710

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1101770

Other (OTH) AF: 0.00 AC: 0 AN: 59338

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000514 Hom.: 0

ExAC AF: 0.00000839 AC: 1

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.18
BayesDel_addAF	Benign	-0.0038	T
BayesDel_noAF	Uncertain	-0.060
CADD	Uncertain	24
DANN	Benign	0.30
DEOGEN2	Uncertain	0.46	T
Eigen	Benign	0.017
Eigen_PC	Benign	0.088
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Benign	0.82	T
M_CAP	Uncertain	0.096	D
MetaRNN	Benign	0.21	T
MetaSVM	Uncertain	0.59	D
MutationAssessor	Benign	1.7	L
PhyloP100		4.5
PrimateAI	Uncertain	0.67	T
PROVEAN	Benign	-1.4	N
REVEL	Uncertain	0.51
Sift	Benign	0.12	T
Sift4G	Benign	0.41	T
Polyphen		0.34	B
Vest4		0.43
MutPred		0.23		Loss of MoRF binding (P = 0.1123)
MVP		0.85
ClinPred		0.099	T
GERP RS		4.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.8
Varity_R		0.24
gMVP		0.23
Mutation Taster		=78/22	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.070		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: rs775639244; hg19: chr16-2129664;