rs387906514

Variant names:

• chr14-75958692-G-A
• rs387906514
• NM_003239.5:c.*495C>T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_003239.5(TGFB3):​c.*495C>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000969 in 206,464 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 Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.0000067 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000018 (0 hom.)
• Consequence: TGFB3 NM_003239.5 3_prime_UTR
• Clinical Significance: Uncertain significance criteria provided, single submitter P:1 U:2
• Conservation: PhyloP100: 2.29

Genes affected

TGFB3 (HGNC:11769): (transforming growth factor beta 3) 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. This protein is involved in embryogenesis and cell differentiation, and may play a role in wound healing. Mutations in this gene are a cause of aortic aneurysms and dissections, as well as familial arrhythmogenic right ventricular dysplasia 1. [provided by RefSeq, Aug 2016]

IFT43 (HGNC:29669): (intraflagellar transport 43) This gene encodes a subunit of the intraflagellar transport complex A (IFT-A). IFT-A is a multiprotein complex that plays an important role in cilia assembly and maintenance by mediating retrograde ciliary transport. Mutations in this gene are a cause of cranioectodermal dysplasia-3 (CED3), also known as Sensenbrenner syndrome. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Dec 2011]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.59).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TGFB3	NM_003239.5	c.*495C>T		3_prime_UTR_variant	Exon 7 of 7	ENST00000238682.8	NP_003230.1
TGFB3	NM_001329939.2	c.*495C>T		3_prime_UTR_variant	Exon 8 of 8		NP_001316868.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TGFB3	ENST00000238682	c.*495C>T		3_prime_UTR_variant	Exon 7 of 7	1	NM_003239.5	ENSP00000238682.3
TGFB3	ENST00000556674	c.*495C>T		3_prime_UTR_variant	Exon 8 of 8	3		ENSP00000502685.1
TGFB3	ENST00000554980.5	n.2115C>T		non_coding_transcript_exon_variant	Exon 4 of 4	2
IFT43	ENST00000555677.5	n.90-30193G>A		intron_variant	Intron 1 of 2	4

Frequencies

GnomAD3 genomes AF: 0.00000667 AC: 1 AN: 149924 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000247

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.0000177 AC: 1 AN: 56540 Hom.: 0 Cov.: 0 AF XY: 0.00 AC XY: 0 AN XY: 28864

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000273

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.00000667 AC: 1 AN: 149924 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 72936

Gnomad4 AFR AF: 0.0000247

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:1 Uncertain:2

Revision: criteria provided, single submitter

Submissions by phenotype

Arrhythmogenic right ventricular dysplasia 1 Pathogenic:1

Feb 01, 2005

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

TGFB3-related disorder Uncertain:1

Nov 21, 2023

PreventionGenetics, part of Exact Sciences

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

The TGFB3 c.*495C>T variant is located in the 3' untranslated region. This variant has been reported in an individual with arrhythmogenic right ventricular cardiomyopathy (Figure 2, referred to as c.1723C>T, Beffagna et al. 2005. PubMed ID: 15639475). This variant has not been reported in a large population database, however, the coverage of this variant should be interpreted with caution. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Rienhoff syndrome Uncertain:1

Aug 13, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant occurs in a non-coding region of the TGFB3 gene. It does not change the encoded amino acid sequence of the TGFB3 protein. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate insufficient coverage at this position in the ExAC database. This variant has been observed in individual(s) with TGFB3-related conditions (PMID: 15639475; Invitae). This variant is also known as c.1723C>T. ClinVar contains an entry for this variant (Variation ID: 12475). Algorithms developed to predict the effect of variants on protein structure and function are not available or were not evaluated for this variant. Experimental studies are conflicting or provide insufficient evidence to determine the effect of this variant on TGFB3 function (PMID: 15639475). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.59
CADD	Benign	13
DANN	Benign	0.56

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: rs387906514; hg19: chr14-76425035;