16-2055472-C-T

Variant names:

• chr16-2055472-C-T
• rs199991910
• NM_000548.5:c.552C>T

Variant summary

Our verdict is Benign. The variant received -15 ACMG points: 0P and 15B. BP4_Moderate BP6_Very_Strong BP7 BS2

The NM_000548.5(TSC2):​c.552C>T​(p.Val184Val) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000222 in 1,614,084 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. V184V) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.00015 (0 hom., cov: 31)
  • Exomes 𝑓: 0.00023 (1 hom.)
• Consequence: TSC2 NM_000548.5 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:10
• Conservation: PhyloP100: 0.786
• 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: 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: Benign. The variant received -15 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.46).
• BP6: Variant 16-2055472-C-T is Benign according to our data. Variant chr16-2055472-C-T is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 318306.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=0.786 with no splicing effect.
• BS2: High AC in GnomAd4 at 23 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

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TSC2	NM_000548.5	MANE Select	c.552C>T	p.Val184Val	synonymous	Exon 6 of 42	NP_000539.2
	TSC2	NM_001406663.1		c.552C>T	p.Val184Val	synonymous	Exon 6 of 42	NP_001393592.1
	TSC2	NM_001114382.3		c.552C>T	p.Val184Val	synonymous	Exon 6 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.552C>T	p.Val184Val	synonymous	Exon 6 of 42	ENSP00000219476.3
	TSC2	ENST00000350773.9	TSL:1	c.552C>T	p.Val184Val	synonymous	Exon 6 of 41	ENSP00000344383.4
	TSC2	ENST00000401874.7	TSL:1	c.552C>T	p.Val184Val	synonymous	Exon 6 of 40	ENSP00000384468.2

Frequencies

GnomAD3 genomes AF: 0.000151 AC: 23 AN: 152196 Hom.: 0 Cov.: 31

Gnomad AFR AF: 0.0000483

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000655

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: 0.000294

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.000163 AC: 41 AN: 251496 AF XY: 0.000154

Gnomad AFR exome AF: 0.0000615

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: 0.000343

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.000229 AC: 335 AN: 1461888 Hom.: 1 Cov.: 31 AF XY: 0.000209 AC XY: 152 AN XY: 727244

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.0000252 AC: 1 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86252

European-Finnish (FIN) AF: 0.0000187 AC: 1 AN: 53420

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.000291 AC: 324 AN: 1112012

Other (OTH) AF: 0.000149 AC: 9 AN: 60396

GnomAD4 genome AF: 0.000151 AC: 23 AN: 152196 Hom.: 0 Cov.: 31 AF XY: 0.0000941 AC XY: 7 AN XY: 74362

African (AFR) AF: 0.0000483 AC: 2 AN: 41444

American (AMR) AF: 0.0000655 AC: 1 AN: 15272

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5200

South Asian (SAS) AF: 0.00 AC: 0 AN: 4834

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10614

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.000294 AC: 20 AN: 68042

Other (OTH) AF: 0.00 AC: 0 AN: 2092

Alfa AF: 0.000159 Hom.: 0

Bravo AF: 0.000151

EpiCase AF: 0.000273

EpiControl AF: 0.000296

ClinVar

ClinVar submissions as Germline

Significance: Benign/Likely benign

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	-	3	Tuberous sclerosis 2 (3)
-	-	2	Hereditary cancer-predisposing syndrome (2)
-	-	2	Tuberous sclerosis syndrome (2)
-	-	1	not provided (1)
-	-	1	not specified (1)
-	-	1	TSC2-related disorder (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.46
CADD	Benign	8.7
DANN	Benign	0.53
PhyloP100		0.79
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.9
Mutation Taster		=100/0	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.19		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: rs199991910; hg19: chr16-2105473; COSMIC: COSV54778382; COSMIC: COSV54778382;