9-132897613-G-T

Position:

• chr9-132897613-G-T

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 0P and 8B. BP4_Strong BS2

The NM_000368.5(TSC1):​c.2626-3C>A variant causes a splice region, splice polypyrimidine tract, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000172 in 1,253,948 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.00029 (0 hom., cov: 14)
  • Exomes 𝑓: 0.00017 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: TSC1 NM_000368.5 splice_region, splice_polypyrimidine_tract, intron
• Scores: Splicing: ADA: 0.004452
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.387

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]

ACMG classification

Verdict is Benign. Variant got -8 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.92).
• BS2: High AC in GnomAdExome4 at 216 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TSC1	NM_000368.5	c.2626-3C>A		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		ENST00000298552.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TSC1	ENST00000298552.9	c.2626-3C>A		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		1	NM_000368.5	P4

Frequencies

GnomAD3 genomes AF: 0.00 AC: 31 AN: 104136 Hom.: 0 Cov.: 14 FAILED QC

Gnomad AFR AF: 0.000664

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000202

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00215

Gnomad SAS AF: 0.000669

Gnomad FIN AF: 0.000276

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000367

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.000172 AC: 216 AN: 1253948 Hom.: 0 Cov.: 27 AF XY: 0.000164 AC XY: 102 AN XY: 623244

Gnomad4 AFR exome AF: 0.000567

Gnomad4 AMR exome AF: 0.000110

Gnomad4 ASJ exome AF: 0.000445

Gnomad4 EAS exome AF: 0.000423

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.000634

Gnomad4 NFE exome AF: 0.000137

Gnomad4 OTH exome AF: 0.000290

GnomAD4 genome Data not reliable, filtered out with message: AS_VQSR AF: 0.000288 AC: 30 AN: 104136 Hom.: 0 Cov.: 14 AF XY: 0.000226 AC XY: 11 AN XY: 48598

Gnomad4 AFR AF: 0.000622

Gnomad4 AMR AF: 0.000202

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00216

Gnomad4 SAS AF: 0.000672

Gnomad4 FIN AF: 0.000276

Gnomad4 NFE AF: 0.0000367

Gnomad4 OTH AF: 0.00

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

curation

Sema4, Sema4

Mar 16, 2022

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.92
CADD	Benign	3.5
DANN	Benign	0.50

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.0045
dbscSNV1_RF	Benign	0.25
SpliceAI score (max)		0.14		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: rs1060503192; hg19: chr9-135773000;