NM_000368.5:c.857C>T

Variant names:

• chr9-132912338-G-A
• rs375144225
• NM_000368.5:c.857C>T

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_000368.5(TSC1):​c.857C>T​(p.Pro286Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 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. P286A) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TSC1 NM_000368.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.10
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• tuberous sclerosis

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• tuberous sclerosis 1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, PanelApp Australia, Genomics England PanelApp, G2P, Labcorp Genetics (formerly Invitae)
• lung lymphangioleiomyomatosis

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
• tuberous sclerosis complex

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.27676225).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TSC1	NM_000368.5	c.857C>T	p.Pro286Leu	missense_variant	Exon 9 of 23	ENST00000298552.9	NP_000359.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TSC1	ENST00000298552.9	c.857C>T	p.Pro286Leu	missense_variant	Exon 9 of 23	1	NM_000368.5	ENSP00000298552.3
TSC1	ENST00000490179.4	c.857C>T	p.Pro286Leu	missense_variant	Exon 10 of 24	3		ENSP00000495533.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.077
BayesDel_addAF	Uncertain	0.10	D
BayesDel_noAF	Benign	-0.090
CADD	Benign	21
DANN	Benign	0.87
DEOGEN2	Uncertain	0.51	D;.;D;.;D;.;D;.;.;.;.;.;.;.;.;.;.;T;.
Eigen	Benign	0.028
Eigen_PC	Benign	0.19
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.91	.;D;D;D;.;.;.;D;D;.;D;.;.;D;D;D;D;D;D
M_CAP	Uncertain	0.095	D
MetaRNN	Benign	0.28	T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Uncertain	0.41	D
MutationAssessor	Uncertain	2.0	M;.;M;.;M;.;M;.;.;.;.;.;.;.;.;.;.;.;.
PhyloP100		3.1
PrimateAI	Benign	0.28	T
PROVEAN	Benign	-0.91	N;N;N;.;.;.;.;.;.;.;.;.;.;.;.;.;.;N;.
REVEL	Uncertain	0.37
Sift	Benign	0.18	T;T;T;.;.;.;.;.;.;.;.;.;.;.;.;.;.;D;.
Sift4G	Benign	0.32	T;T;T;.;.;.;.;.;.;.;.;.;.;.;.;.;.;T;.
Polyphen		0.0040	B;.;B;.;B;.;B;.;.;.;.;B;B;B;.;.;.;B;.
Vest4		0.41
MutPred		0.54		Loss of disorder (P = 0.0171);.;Loss of disorder (P = 0.0171);Loss of disorder (P = 0.0171);Loss of disorder (P = 0.0171);Loss of disorder (P = 0.0171);Loss of disorder (P = 0.0171);Loss of disorder (P = 0.0171);Loss of disorder (P = 0.0171);.;.;Loss of disorder (P = 0.0171);Loss of disorder (P = 0.0171);Loss of disorder (P = 0.0171);Loss of disorder (P = 0.0171);Loss of disorder (P = 0.0171);.;Loss of disorder (P = 0.0171);.;
MVP		0.69
MPC		0.53
ClinPred		0.52	D
GERP RS		4.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.065
gMVP		0.33
Mutation Taster		=89/11	polymorphism

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

Other links and lift over

dbSNP: rs375144225; hg19: chr9-135787725;