rs1060501982

Positions:

• chr1-218347023-A-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BS2

The NM_003238.6(TGFB2):​c.322A>T​(p.Met108Leu) variant causes a missense change. The variant allele was found at a frequency of 0.00000345 in 1,447,626 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000035 (0 hom.)
• Consequence: TGFB2 NM_003238.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.97

Genes affected

TGFB2 (HGNC:11768): (transforming growth factor beta 2) This gene encodes a secreted ligand of the TGF-beta (transforming growth factor-beta) superfamily of proteins. Ligands of this family bind various TGF-beta receptors leading to recruitment and activation of SMAD family transcription factors that regulate gene expression. The encoded preproprotein is proteolytically processed to generate a latency-associated peptide (LAP) and a mature peptide, and is found in either a latent form composed of a mature peptide homodimer, a LAP homodimer, and a latent TGF-beta binding protein, or in an active form consisting solely of the mature peptide homodimer. The mature peptide may also form heterodimers with other TGF-beta family members. Disruption of the TGF-beta/SMAD pathway has been implicated in a variety of human cancers. A chromosomal translocation that includes this gene is associated with Peters' anomaly, a congenital defect of the anterior chamber of the eye. Mutations in this gene may be associated with Loeys-Dietz syndrome. This gene encodes multiple isoforms that may undergo similar proteolytic processing. [provided by RefSeq, Aug 2016]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BS2: High AC in GnomAdExome4 at 5 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TGFB2	NM_003238.6	c.322A>T	p.Met108Leu	missense_variant	1/7	ENST00000366930.9	NP_003229.1
TGFB2	NM_001135599.4	c.322A>T	p.Met108Leu	missense_variant	1/8		NP_001129071.1
TGFB2	NR_138148.2	n.1688A>T		non_coding_transcript_exon_variant	1/7
TGFB2	NR_138149.2	n.1688A>T		non_coding_transcript_exon_variant	1/8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TGFB2	ENST00000366930.9	c.322A>T	p.Met108Leu	missense_variant	1/7	1	NM_003238.6	ENSP00000355897	P1
TGFB2	ENST00000366929.4	c.322A>T	p.Met108Leu	missense_variant	1/8	1		ENSP00000355896
TGFB2	ENST00000488793.1			upstream_gene_variant		3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000345 AC: 5 AN: 1447626 Hom.: 0 Cov.: 31 AF XY: 0.00000139 AC XY: 1 AN XY: 718952

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.0000767

Gnomad4 NFE exome AF: 9.05e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Loeys-Dietz syndrome 4 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 08, 2016

Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). In summary, this variant is a novel missense change with uncertain impact on protein function. It has been classified as a Variant of Uncertain Significance. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a TGFB2-related disease. This sequence change replaces methionine with leucine at codon 108 of the TGFB2 protein (p.Met108Leu). The methionine residue is highly conserved and there is a small physicochemical difference between methionine and leucine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.29
BayesDel_addAF	Pathogenic	0.18	D
BayesDel_noAF	Uncertain	0.030
CADD	Uncertain	23
DANN	Uncertain	0.98
DEOGEN2	Uncertain	0.58	D;.
Eigen	Uncertain	0.61
Eigen_PC	Uncertain	0.63
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Uncertain	0.87	D;D
M_CAP	Benign	0.056	D
MetaRNN	Uncertain	0.58	D;D
MetaSVM	Uncertain	0.082	D
MutationAssessor	Pathogenic	3.1	M;M
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.58	T
PROVEAN	Benign	-2.2	N;N
REVEL	Uncertain	0.57
Sift	Uncertain	0.0070	D;D
Sift4G	Uncertain	0.033	D;T
Polyphen		0.84	P;P
Vest4		0.44
MutPred		0.71		Loss of ubiquitination at K105 (P = 0.0613);Loss of ubiquitination at K105 (P = 0.0613);
MVP		0.89
MPC		0.74
ClinPred		0.96	D
GERP RS		5.5
Varity_R		0.61
gMVP		0.66

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

LitVar

Other links and lift over

dbSNP: rs1060501982; hg19: chr1-218520365;