chr9-132896644-C-A

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 1P and 6B. PP2BP4_ModerateBS2

The NM_000368.5(TSC1):​c.3086G>T​(p.Ser1029Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000164 in 1,461,712 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S1029N) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 32)
Exomes 𝑓: 0.000016 ( 0 hom. )

Consequence

TSC1
NM_000368.5 missense

Scores

5
14

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:1

Conservation

PhyloP100: 2.05
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]

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -5 ACMG points.

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.
BP4
Computational evidence support a benign effect (MetaRNN=0.07975188).
BS2
High AC in GnomAdExome4 at 24 AD gene.

Transcripts

RefSeq

Gene Transcript HGVSc HGVSp Effect #exon/exons MANE UniProt
TSC1NM_000368.5 linkuse as main transcriptc.3086G>T p.Ser1029Ile missense_variant 23/23 ENST00000298552.9

Ensembl

Gene Transcript HGVSc HGVSp Effect #exon/exons TSL MANE Appris UniProt
TSC1ENST00000298552.9 linkuse as main transcriptc.3086G>T p.Ser1029Ile missense_variant 23/231 NM_000368.5 P4Q92574-1

Frequencies

GnomAD3 genomes
Cov.:
32
GnomAD3 exomes
AF:
0.00000401
AC:
1
AN:
249308
Hom.:
0
AF XY:
0.00
AC XY:
0
AN XY:
135318
show subpopulations
Gnomad AFR exome
AF:
0.00
Gnomad AMR exome
AF:
0.00
Gnomad ASJ exome
AF:
0.00
Gnomad EAS exome
AF:
0.00
Gnomad SAS exome
AF:
0.00
Gnomad FIN exome
AF:
0.00
Gnomad NFE exome
AF:
0.00000888
Gnomad OTH exome
AF:
0.00
GnomAD4 exome
AF:
0.0000164
AC:
24
AN:
1461712
Hom.:
0
Cov.:
31
AF XY:
0.0000151
AC XY:
11
AN XY:
727150
show subpopulations
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:
0.00
Gnomad4 FIN exome
AF:
0.00
Gnomad4 NFE exome
AF:
0.0000216
Gnomad4 OTH exome
AF:
0.00
GnomAD4 genome
Cov.:
32

ClinVar

Significance: Conflicting classifications of pathogenicity
Submissions summary: Uncertain:3Benign:1
Revision: criteria provided, conflicting classifications
LINK: link

Submissions by phenotype

Tuberous sclerosis 1 Uncertain:2Benign:1
Likely benign, criteria provided, single submitterclinical testingInvitaeDec 22, 2023- -
Uncertain significance, criteria provided, single submitterclinical testingSt. Jude Molecular Pathology, St. Jude Children's Research HospitalApr 27, 2023The TSC1 c.3086G>T (p.Ser1029Ile) missense change has a maximum subpopulation frequency of 0.0009% in gnomAD v2.1.1 (https://gnomad.broadinstitute.org/). The in silico tool REVEL predicts a benign effect on protein function, but this prediction has not been confirmed by functional studies. This variant has not been reported in individuals with tuberous sclerosis complex. In summary, the evidence currently available is insufficient to determine the clinical significance of this variant. It has therefore been classified as of uncertain significance. -
Uncertain significance, criteria provided, single submitterclinical testingGenome-Nilou LabNov 07, 2021- -
not provided Uncertain:1
Uncertain significance, criteria provided, single submitterclinical testingGeneDxNov 20, 2014p.Ser1029Ile (AGT>ATT): c.3086 G>T in exon 23 of the TSC1 gene (NM_000368.4). The S1029I variant has not been published as a mutation, nor has it been reported as a benign polymorphism to our knowledge. It was not observed in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. The S1029I variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. However, this substitution occurs at a position that is not conserved across species, and in silico analysis predicts this variant likely does not alter the protein structure/function. Additionally, the vast majority of TSC1 mutations result in protein truncation, while missense mutations have been reported only rarely (Northrup et al., 2011; Au et al., 2007). Therefore, based on the currently available information, it is unclear whether S1029I is a pathogenic mutation or a rare benign variant. The variant is found in TUBSC-EPIV2,TSC1 panel(s). -

Computational scores

Source: dbNSFP v4.3

Name
Calibrated prediction
Score
Prediction
AlphaMissense
Benign
0.12
BayesDel_addAF
Benign
-0.0065
T
BayesDel_noAF
Benign
-0.25
CADD
Benign
19
DANN
Uncertain
0.99
DEOGEN2
Uncertain
0.47
T;.;T;.;.;T;.;T;.;.;.
Eigen
Benign
-0.72
Eigen_PC
Benign
-0.64
FATHMM_MKL
Uncertain
0.83
D
LIST_S2
Benign
0.57
.;T;T;T;T;.;.;.;T;T;.
M_CAP
Benign
0.041
D
MetaRNN
Benign
0.080
T;T;T;T;T;T;T;T;T;T;T
MetaSVM
Benign
-0.75
T
MutationAssessor
Benign
1.8
L;.;L;.;.;L;.;L;.;.;.
MutationTaster
Benign
0.57
D;D;N;N
PrimateAI
Benign
0.33
T
PROVEAN
Benign
-1.7
N;N;N;.;.;.;.;.;.;.;.
REVEL
Benign
0.16
Sift
Uncertain
0.019
D;D;D;.;.;.;.;.;.;.;.
Sift4G
Uncertain
0.0080
D;D;D;.;.;.;.;.;.;.;.
Polyphen
0.41
B;.;B;.;.;B;.;B;.;.;.
Vest4
0.17
MutPred
0.25
Loss of phosphorylation at S1029 (P = 7e-04);.;Loss of phosphorylation at S1029 (P = 7e-04);.;.;Loss of phosphorylation at S1029 (P = 7e-04);.;Loss of phosphorylation at S1029 (P = 7e-04);.;.;.;
MVP
0.49
MPC
0.74
ClinPred
0.49
T
GERP RS
4.0
Varity_R
0.058
gMVP
0.55

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

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

Other links and lift over

dbSNP: rs796053450; hg19: chr9-135772031; API