15-67065987-C-T

Variant names:

• chr15-67065987-C-T
• rs886051377
• NM_005902.4:c.-168C>T

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_005902.4(SMAD3):​c.-168C>T variant causes a 5 prime UTR premature start codon gain change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000105 in 95,236 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.000011 (0 hom.)
• Consequence: SMAD3 NM_005902.4 5_prime_UTR_premature_start_codon_gain
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.449
• Publications: 0 publications found

Genes affected

SMAD3 (HGNC:6769): (SMAD family member 3) The SMAD family of proteins are a group of intracellular signal transducer proteins similar to the gene products of the Drosophila gene 'mothers against decapentaplegic' (Mad) and the C. elegans gene Sma. The SMAD3 protein functions in the transforming growth factor-beta signaling pathway, and transmits signals from the cell surface to the nucleus, regulating gene activity and cell proliferation. This protein forms a complex with other SMAD proteins and binds DNA, functioning both as a transcription factor and tumor suppressor. Mutations in this gene are associated with aneurysms-osteoarthritis syndrome and Loeys-Dietz Syndrome 3. [provided by RefSeq, May 2022]

SMAD3 Gene-Disease associations (from GenCC):

• aneurysm-osteoarthritis syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: PanelApp Australia, Genomics England PanelApp, Orphanet, G2P, ClinGen, Labcorp Genetics (formerly Invitae)
• familial thoracic aortic aneurysm and aortic dissection

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.36).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SMAD3	NM_005902.4	c.-168C>T		5_prime_UTR_premature_start_codon_gain_variant	Exon 1 of 9	ENST00000327367.9	NP_005893.1
SMAD3	NM_005902.4	c.-168C>T		5_prime_UTR_variant	Exon 1 of 9	ENST00000327367.9	NP_005893.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SMAD3	ENST00000327367.9	c.-168C>T		5_prime_UTR_premature_start_codon_gain_variant	Exon 1 of 9	1	NM_005902.4	ENSP00000332973.4
SMAD3	ENST00000327367.9	c.-168C>T		5_prime_UTR_variant	Exon 1 of 9	1	NM_005902.4	ENSP00000332973.4

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.0000105 AC: 1 AN: 95236 Hom.: 0 Cov.: 3 AF XY: 0.00 AC XY: 0 AN XY: 49430

African (AFR) AF: 0.00 AC: 0 AN: 2730

American (AMR) AF: 0.00 AC: 0 AN: 2260

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3742

East Asian (EAS) AF: 0.00 AC: 0 AN: 8608

South Asian (SAS) AF: 0.00 AC: 0 AN: 1608

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 4218

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 502

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 65262

Other (OTH) AF: 0.000159 AC: 1 AN: 6306

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.36
CADD	Benign	15
DANN	Benign	0.97
PhyloP100		-0.45
PromoterAI		-0.099	Neutral

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: rs886051377; hg19: chr15-67358325;