16-2075890-CAAGT-C

Variant names:

• chr16-2075890-CAAGT-C
• rs137854081
• ENST00000439117.6:n.*1937_*1938+2delAAGT

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The ENST00000439117.6(TSC2):​n.*1937_*1938+2delAAGT variant causes a splice region, non coding transcript exon change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 1/1 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as not provided (no stars).

• Frequency: Genomes: not found (cov: 33)
• Consequence: TSC2 ENST00000439117.6 splice_region, non_coding_transcript_exon
• Clinical Significance: not provided no classification provided O:1
• Conservation: PhyloP100: 9.68
• Publications: 1 publications found

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]

TSC2 Gene-Disease associations (from GenCC):

• tuberous sclerosis

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• tuberous sclerosis 2

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: PanelApp Australia, Laboratory for Molecular Medicine, Labcorp Genetics (formerly Invitae), G2P, Genomics England PanelApp, Ambry Genetics
• 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 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

Variant Effect in Transcripts

ACMG analysis was done for transcript: ENST00000439117.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TSC2	NM_000548.5	MANE Select	c.2638_2639+2delAAGT	p.Lys880LeufsTer13	frameshift splice_donor splice_region intron	Exon 23 of 42	NP_000539.2
	TSC2	NM_001406663.1		c.2638_2639+2delAAGT	p.Lys880LeufsTer13	frameshift splice_donor splice_region intron	Exon 23 of 42	NP_001393592.1
	TSC2	NM_001114382.3		c.2638_2639+2delAAGT	p.Lys880LeufsTer13	frameshift splice_donor splice_region intron	Exon 23 of 41	NP_001107854.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TSC2	ENST00000439117.6	TSL:1	n.*1937_*1938+2delAAGT		splice_region non_coding_transcript_exon	Exon 20 of 38	ENSP00000406980.2
	TSC2	ENST00000219476.9	TSL:5 MANE Select	c.2638_2639+2delAAGT	p.Lys880LeufsTer13	frameshift splice_donor splice_region intron	Exon 23 of 42	ENSP00000219476.3
	TSC2	ENST00000350773.9	TSL:1	c.2638_2639+2delAAGT	p.Lys880LeufsTer13	frameshift splice_donor splice_region intron	Exon 23 of 41	ENSP00000344383.4

Frequencies

GnomAD3 genomes Cov.: 33

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 33

ClinVar

Significance: not provided

Submissions summary: Other:1

Revision: no classification provided

Submissions by phenotype

Tuberous sclerosis syndrome Other:1

Tuberous sclerosis database (TSC2)

Significance: not provided

Review Status: no classification provided

Collection Method: curation

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		9.7
Mutation Taster		=0/200	disease causing (fs/PTC)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		1.0		Details are displayed if max score is > 0.2
DS_DL_spliceai		1.0		Position offset: 2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs137854081; hg19: chr16-2125891;