rs45454201

Positions:

• chr16-2084733-G-A

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_000548.5(TSC2):​c.4493+18G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000317 in 1,598,412 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 (★★).

• Frequency:
  • Genomes: 𝑓 0.00029 (0 hom., cov: 33)
  • Exomes 𝑓: 0.00032 (1 hom.)
• Consequence: TSC2 NM_000548.5 intron
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5 O:1
• Conservation: PhyloP100: -0.270

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]

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.89).
• BP6: Variant 16-2084733-G-A is Benign according to our data. Variant chr16-2084733-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 49996.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr16-2084733-G-A is described in Lovd as [Benign]. Variant chr16-2084733-G-A is described in Lovd as [Likely_benign].
• BS1: Variant frequency is greater than expected in population eas. gnomad4 allele frequency = 0.000289 (44/152350) while in subpopulation EAS AF= 0.00656 (34/5182). AF 95% confidence interval is 0.00483. There are 0 homozygotes in gnomad4. There are 24 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High AC in GnomAd4 at 44 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TSC2	NM_000548.5	c.4493+18G>A		intron_variant		ENST00000219476.9	NP_000539.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TSC2	ENST00000219476.9	c.4493+18G>A		intron_variant		5	NM_000548.5	ENSP00000219476

Frequencies

GnomAD3 genomes AF: 0.000289 AC: 44 AN: 152232 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000654

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00655

Gnomad SAS AF: 0.000827

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000441

Gnomad OTH AF: 0.000478

GnomAD3 exomes AF: 0.000871 AC: 205 AN: 235416 Hom.: 1 AF XY: 0.000891 AC XY: 115 AN XY: 129114

Gnomad AFR exome AF: 0.000130

Gnomad AMR exome AF: 0.000116

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0103

Gnomad SAS exome AF: 0.000131

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000549

Gnomad OTH exome AF: 0.000336

GnomAD4 exome AF: 0.000320 AC: 463 AN: 1446062 Hom.: 1 Cov.: 33 AF XY: 0.000345 AC XY: 248 AN XY: 719770

Gnomad4 AFR exome AF: 0.0000598

Gnomad4 AMR exome AF: 0.000112

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00889

Gnomad4 SAS exome AF: 0.000232

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000576

Gnomad4 OTH exome AF: 0.000299

GnomAD4 genome AF: 0.000289 AC: 44 AN: 152350 Hom.: 0 Cov.: 33 AF XY: 0.000322 AC XY: 24 AN XY: 74490

Gnomad4 AFR AF: 0.0000241

Gnomad4 AMR AF: 0.0000653

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00656

Gnomad4 SAS AF: 0.000827

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000441

Gnomad4 OTH AF: 0.000473

Alfa AF: 0.0000854 Hom.: 0

Bravo AF: 0.000646

Asia WGS AF: 0.00289 AC: 10 AN: 3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:5 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Tuberous sclerosis 2 Benign:2

Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Feb 01, 2024	- -
Benign, criteria provided, single submitter	clinical testing	KCCC/NGS Laboratory, Kuwait Cancer Control Center	Jul 07, 2023	- -

not provided Benign:2

Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Dec 01, 2022	TSC2: BS1 -
Benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Jun 22, 2022	- -

not specified Benign:1

Benign, criteria provided, single submitter

clinical testing

GeneDx

Apr 17, 2014

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Tuberous sclerosis syndrome Other:1

not provided, no classification provided

curation

Tuberous sclerosis database (TSC2)

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- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.89
CADD	Benign	2.1
DANN	Benign	0.47

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

Publications

LitVar

Other links and lift over

dbSNP: rs45454201; hg19: chr16-2134734;