chr14-75959320-TTCAG-T

Variant names:

• chr14-75959320-TTCAG-T
• rs1555360047
• NM_003239.5:c.1102_1105delCTGA

Variant summary

Our verdict is Pathogenic. The variant received 14 ACMG points: 14P and 0B. PVS1_Strong PM2 PP5_Very_Strong

The NM_003239.5(TGFB3):​c.1102_1105delCTGA​(p.Leu368ThrfsTer18) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: TGFB3 NM_003239.5 frameshift
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 9.32
• Publications: 1 publications found

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]

IFT43 Gene-Disease associations (from GenCC):

• cranioectodermal dysplasia 3

  Inheritance: AR Classification: DEFINITIVE Submitted by: G2P
• short-rib thoracic dysplasia 18 with polydactyly

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• cranioectodermal dysplasia

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• ciliopathy

  Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics
• retinitis pigmentosa 81

  Inheritance: AR, Unknown Classification: LIMITED Submitted by: Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Pathogenic. The variant received 14 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. There are 8 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 14-75959320-TTCAG-T is Pathogenic according to our data. Variant chr14-75959320-TTCAG-T is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 520206.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_003239.5. 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
	TGFB3	NM_003239.5	MANE Select	c.1102_1105delCTGA	p.Leu368ThrfsTer18	frameshift	Exon 7 of 7	NP_003230.1
	TGFB3	NM_001329939.2		c.1102_1105delCTGA	p.Leu368ThrfsTer18	frameshift	Exon 8 of 8	NP_001316868.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TGFB3	ENST00000238682.8	TSL:1 MANE Select	c.1102_1105delCTGA	p.Leu368ThrfsTer18	frameshift	Exon 7 of 7	ENSP00000238682.3
	TGFB3	ENST00000556674.2	TSL:3	c.1102_1105delCTGA	p.Leu368ThrfsTer18	frameshift	Exon 8 of 8	ENSP00000502685.1
	TGFB3	ENST00000554980.5	TSL:2	n.1483_1486delCTGA		non_coding_transcript_exon	Exon 4 of 4

Frequencies

GnomAD3 genomes Cov.: 32

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

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Familial thoracic aortic aneurysm and aortic dissection Pathogenic:1

Mar 06, 2025

Ambry Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1102_1105delCTGA (p.L368Tfs*18) alteration, located in exon 7 (coding exon 7) of the TGFB3 gene, consists of a deletion of 4 nucleotides from position 1102 to 1105, causing a translational frameshift with a predicted alternate stop codon after 18 amino acids. This alteration occurs at the 3' terminus of theTGFB3 gene, is not expected to trigger nonsense-mediated mRNA decay, and only impacts the last 10% of the protein. However, premature stop codons are typically deleterious in nature and the impacted region is critical for protein function (Ambry internal data). This variant was not reported in population-based cohorts in the Genome Aggregation Database (gnomAD). Based on the available evidence, this alteration is classified as pathogenic.

Arrhythmogenic right ventricular dysplasia 1;C3810012:Rienhoff syndrome Pathogenic:1

Sep 26, 2021

Fulgent Genetics, Fulgent Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Rienhoff syndrome Pathogenic:1

May 05, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. This variant disrupts a region of the TGFB3 protein in which other variant(s) (p.Lys407*) have been determined to be pathogenic (Invitae). This suggests that this is a clinically significant region of the protein, and that variants that disrupt it are likely to be disease-causing. ClinVar contains an entry for this variant (Variation ID: 520206). This variant has not been reported in the literature in individuals affected with TGFB3-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Leu368Thrfs*18) in the TGFB3 gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 45 amino acid(s) of the TGFB3 protein.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		9.3

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: rs1555360047; hg19: chr14-76425663;