16-2071869-G-C

Position:

• chr16-2071869-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PM5

The NM_000548.5(TSC2):​c.2032G>C​(p.Ala678Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A678D) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: TSC2 NM_000548.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.388

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 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr16-2071869-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TSC2	NM_000548.5	c.2032G>C	p.Ala678Pro	missense_variant	19/42	ENST00000219476.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TSC2	ENST00000219476.9	c.2032G>C	p.Ala678Pro	missense_variant	19/42	5	NM_000548.5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.091
BayesDel_addAF	Uncertain	0.12	D
BayesDel_noAF	Uncertain	-0.060
CADD	Benign	12
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.57	D;.;.;.;.;.;.;.;.;.;.;.;T;.;T
Eigen	Benign	-0.68
Eigen_PC	Benign	-0.79
FATHMM_MKL	Benign	0.27	N
LIST_S2	Benign	0.84	T;T;T;T;T;T;T;T;T;T;T;T;T;T;T
M_CAP	Pathogenic	0.34	D
MetaRNN	Uncertain	0.55	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Benign	-0.47	T
MutationAssessor	Benign	0.69	N;.;.;.;N;N;.;.;.;N;.;N;.;.;.
MutationTaster	Benign	1.0	N;N;N;N;N;N;N
PrimateAI	Uncertain	0.53	T
PROVEAN	Benign	-1.7	N;.;.;N;.;N;.;.;N;N;.;.;.;.;N
REVEL	Uncertain	0.56
Sift	Benign	0.090	T;.;.;T;.;T;.;.;T;D;.;.;.;.;T
Sift4G	Uncertain	0.059	T;.;.;T;.;T;.;.;T;T;.;.;.;.;T
Polyphen		0.92	P;.;.;.;P;P;.;.;P;B;.;.;.;.;.
Vest4		0.35
MutPred		0.67		Gain of catalytic residue at P677 (P = 0.0186);Gain of catalytic residue at P677 (P = 0.0186);Gain of catalytic residue at P677 (P = 0.0186);.;Gain of catalytic residue at P677 (P = 0.0186);Gain of catalytic residue at P677 (P = 0.0186);Gain of catalytic residue at P677 (P = 0.0186);Gain of catalytic residue at P677 (P = 0.0186);.;Gain of catalytic residue at P677 (P = 0.0186);Gain of catalytic residue at P677 (P = 0.0186);Gain of catalytic residue at P677 (P = 0.0186);Gain of catalytic residue at P677 (P = 0.0186);Gain of catalytic residue at P677 (P = 0.0186);.;
MVP		0.93
ClinPred		0.42	T
GERP RS		-0.71
Varity_R		0.16
gMVP		0.44

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr16-2121870;