rs766461065

Positions:

• chr16-2062544-C-G
• chr16-2062544-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_000548.5(TSC2):​c.1305C>G​(p.His435Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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. H435Y) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (1 hom.)
  • Failed GnomAD Quality Control
• Consequence: TSC2 NM_000548.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.502

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 Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.1932548).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TSC2	NM_000548.5	c.1305C>G	p.His435Gln	missense_variant	13/42	ENST00000219476.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TSC2	ENST00000219476.9	c.1305C>G	p.His435Gln	missense_variant	13/42	5	NM_000548.5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 0.00000137 AC: 2 AN: 1460284 Hom.: 1 Cov.: 31 AF XY: 0.00000275 AC XY: 2 AN XY: 726208

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000233

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ExAC AF: 0.0000165 AC: 2

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 01, 2022

The p.H435Q variant (also known as c.1305C>G), located in coding exon 12 of the TSC2 gene, results from a C to G substitution at nucleotide position 1305. The histidine at codon 435 is replaced by glutamine, an amino acid with highly similar properties. This amino acid position is conserved. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.56
BayesDel_addAF	Uncertain	0.16	D
BayesDel_noAF	Uncertain	-0.010
CADD	Benign	14
DANN	Benign	0.78
DEOGEN2	Uncertain	0.58	D;.;.;.;.;.;.;.;.;.;.;.;T;.;T
Eigen	Benign	-0.87
Eigen_PC	Benign	-0.86
FATHMM_MKL	Benign	0.68	D
LIST_S2	Benign	0.75	T;T;T;T;T;T;T;T;T;T;T;T;T;T;T
M_CAP	Benign	0.083	D
MetaRNN	Benign	0.19	T;T;T;T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.52	T
MutationAssessor	Benign	1.5	L;.;.;.;L;L;.;.;.;L;.;L;.;.;.
MutationTaster	Benign	0.99	D;D;D;D;D;D;D
PrimateAI	Uncertain	0.61	T
PROVEAN	Benign	-2.1	N;.;.;N;.;N;.;.;N;N;.;.;.;.;N
REVEL	Uncertain	0.52
Sift	Benign	0.32	T;.;.;T;.;T;.;.;T;T;.;.;.;.;T
Sift4G	Benign	0.61	T;.;.;T;.;T;.;.;T;T;.;.;.;.;T
Polyphen		0.55	P;.;.;.;B;P;.;.;B;B;.;.;.;.;.
Vest4		0.34
MutPred		0.41		Loss of catalytic residue at Q432 (P = 0.0281);Loss of catalytic residue at Q432 (P = 0.0281);Loss of catalytic residue at Q432 (P = 0.0281);.;Loss of catalytic residue at Q432 (P = 0.0281);Loss of catalytic residue at Q432 (P = 0.0281);Loss of catalytic residue at Q432 (P = 0.0281);Loss of catalytic residue at Q432 (P = 0.0281);.;Loss of catalytic residue at Q432 (P = 0.0281);Loss of catalytic residue at Q432 (P = 0.0281);Loss of catalytic residue at Q432 (P = 0.0281);Loss of catalytic residue at Q432 (P = 0.0281);Loss of catalytic residue at Q432 (P = 0.0281);.;
MVP		0.94
ClinPred		0.19	T
GERP RS		-5.0
Varity_R		0.10
gMVP		0.46

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: rs766461065; hg19: chr16-2112545;