rs1554820281

Positions:

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2PP2

The NM_000368.5(TSC1):c.312G>T(p.Lys104Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000657 in 152,202 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Consequence

TSC1
NM_000368.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 1.44

Variant links:

Genes affected

TSC1 (HGNC:12362): (TSC complex subunit 1) This gene is a tumor suppressor gene that encodes the growth inhibitory protein hamartin. The encoded protein interacts with and stabilizes the GTPase activating protein tuberin. This hamartin-tuberin complex negatively regulates mammalian target of rapamycin complex 1 (mTORC1) signaling which is a major regulator of anabolic cell growth. This protein also functions as a co-chaperone for Hsp90 that inhibits its ATPase activity. This protein functions as a facilitator of Hsp90-mediated folding of kinase and non-kinase clients, including TSC2 and thereby preventing their ubiquitination and proteasomal degradation. Mutations in this gene have been associated with tuberous sclerosis and lymphangioleiomyomatosis. [provided by RefSeq, May 2022]

TSC1 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP2

Missense variant in gene, where missense usually causes diseases (based on misZ statistic), TSC1. . Gene score misZ 2.3217 (greater than the threshold 3.09). Trascript score misZ 3.6986 (greater than threshold 3.09). GenCC has associacion of gene with lung lymphangioleiomyomatosis, tuberous sclerosis 1, tuberous sclerosis, tuberous sclerosis complex, lymphangioleiomyomatosis.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TSC1	NM_000368.5 linkuse as main transcript	c.312G>T	p.Lys104Asn	missense_variant	5/23	ENST00000298552.9	NP_000359.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TSC1	ENST00000298552.9 linkuse as main transcript	c.312G>T	p.Lys104Asn	missense_variant	5/23	1	NM_000368.5	ENSP00000298552	P4	Q92574-1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152202

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD4 exome

Cov.:

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152202

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74362

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Tuberous sclerosis 1

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 03, 2021

This variant is not present in population databases (ExAC no frequency). This sequence change replaces lysine with asparagine at codon 104 of the TSC1 protein (p.Lys104Asn). The lysine residue is moderately conserved and there is a moderate physicochemical difference between lysine and asparagine. This variant has not been reported in the literature in individuals affected with TSC1-related conditions. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). -

Isolated focal cortical dysplasia type II

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Baylor Genetics

Dec 30, 2023

- -

Hereditary cancer-predisposing syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 18, 2021

The p.K104N variant (also known as c.312G>T), located in coding exon 3 of the TSC1 gene, results from a G to T substitution at nucleotide position 312. The lysine at codon 104 is replaced by asparagine, an amino acid with similar properties. This amino acid position is well conserved in available vertebrate species. 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

Pathogenic

0.94

BayesDel_addAF

Uncertain

0.072

BayesDel_noAF

Benign

-0.13

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.49

T;T;.;T;.;T;.;.;.;.;.;.;.;T;.;.

Eigen

Uncertain

0.41

Eigen_PC

Uncertain

0.35

FATHMM_MKL

Uncertain

0.88

LIST_S2

Uncertain

0.95

.;D;D;.;.;.;D;D;.;.;D;D;D;D;D;D

M_CAP

Uncertain

0.14

MetaRNN

Uncertain

0.46

T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T

MetaSVM

Uncertain

0.36

MutationAssessor

Uncertain

2.3

M;M;.;M;.;M;.;.;.;.;.;.;.;.;.;.

MutationTaster

Benign

0.89

D;D;D;D;D

PrimateAI

Uncertain

0.70

PROVEAN

Benign

-0.82

N;N;.;.;.;.;.;.;.;.;.;.;.;N;.;.

REVEL

Uncertain

0.53

Sift

Uncertain

0.014

D;D;.;.;.;.;.;.;.;.;.;.;.;D;.;.

Sift4G

Uncertain

0.016

D;D;.;.;.;.;.;.;.;.;.;.;.;D;.;.

Polyphen

0.98

D;D;.;D;.;D;.;.;D;D;D;.;.;D;.;.

Vest4

0.73

MutPred

0.47

Loss of methylation at K104 (P = 0.0273);Loss of methylation at K104 (P = 0.0273);Loss of methylation at K104 (P = 0.0273);Loss of methylation at K104 (P = 0.0273);Loss of methylation at K104 (P = 0.0273);Loss of methylation at K104 (P = 0.0273);Loss of methylation at K104 (P = 0.0273);Loss of methylation at K104 (P = 0.0273);Loss of methylation at K104 (P = 0.0273);Loss of methylation at K104 (P = 0.0273);Loss of methylation at K104 (P = 0.0273);Loss of methylation at K104 (P = 0.0273);Loss of methylation at K104 (P = 0.0273);Loss of methylation at K104 (P = 0.0273);Loss of methylation at K104 (P = 0.0273);Loss of methylation at K104 (P = 0.0273);

MVP

0.88

MPC

1.5

ClinPred

0.86

GERP RS

2.5

Varity_R

0.23

gMVP

0.48

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over