Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4BP6
The NM_000548.5(TSC2):c.4001G>A(p.Ser1334Asn) variant causes a missense change. The variant allele was found at a frequency of 0.00000248 in 1,610,852 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).
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]
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=0.37479782).
BP6
Variant 16-2083812-G-A is Benign according to our data. Variant chr16-2083812-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 406097.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=2}.
Review Status: criteria provided, single submitter
Collection Method: clinical testing
The p.S1334N variant (also known as c.4001G>A), located in coding exon 32 of the TSC2 gene, results from a G to A substitution at nucleotide position 4001. The serine at codon 1334 is replaced by asparagine, an amino acid with highly similar properties. This amino acid position is highly 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. -
Tuberous sclerosis 2 Benign:1
Jan 26, 2025
Labcorp Genetics (formerly Invitae), Labcorp
Significance: Likely benign
Review Status: criteria provided, single submitter