chr15-67085998-C-T

Variant names:

• chr15-67085998-C-T
• rs28683050
• NM_005902.4:c.206+19638C>T

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BS1 BS2

The NM_005902.4(SMAD3):​c.206+19638C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00246 in 151,832 control chromosomes in the GnomAD database, including 1 homozygotes. 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: 𝑓 0.0025 (1 hom., cov: 29)
• Consequence: SMAD3 NM_005902.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.112
• Publications: 4 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: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.85).
• BS1: Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00246 (374/151832) while in subpopulation AFR AF = 0.00844 (349/41352). AF 95% confidence interval is 0.00771. There are 1 homozygotes in GnomAd4. There are 170 alleles in the male GnomAd4 subpopulation. Median coverage is 29. This position passed quality control check.
• BS2: High AC in GnomAd4 at 374 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SMAD3	NM_005902.4	c.206+19638C>T		intron_variant	Intron 1 of 8	ENST00000327367.9	NP_005893.1
SMAD3	NM_001407011.1	c.206+19638C>T		intron_variant	Intron 1 of 9		NP_001393940.1
SMAD3	NM_001407012.1	c.206+19638C>T		intron_variant	Intron 1 of 7		NP_001393941.1
SMAD3	NM_001407013.1	c.206+19638C>T		intron_variant	Intron 1 of 7		NP_001393942.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SMAD3	ENST00000327367.9	c.206+19638C>T		intron_variant	Intron 1 of 8	1	NM_005902.4	ENSP00000332973.4

Frequencies

GnomAD3 genomes AF: 0.00247 AC: 374 AN: 151716 Hom.: 1 Cov.: 29

Gnomad AFR AF: 0.00846

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00112

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: 0.0000294

Gnomad OTH AF: 0.00288

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

GnomAD4 genome AF: 0.00246 AC: 374 AN: 151832 Hom.: 1 Cov.: 29 AF XY: 0.00229 AC XY: 170 AN XY: 74164

African (AFR) AF: 0.00844 AC: 349 AN: 41352

American (AMR) AF: 0.00111 AC: 17 AN: 15248

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3466

East Asian (EAS) AF: 0.00 AC: 0 AN: 5160

South Asian (SAS) AF: 0.00 AC: 0 AN: 4796

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10522

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 292

European-Non Finnish (NFE) AF: 0.0000294 AC: 2 AN: 67980

Other (OTH) AF: 0.00285 AC: 6 AN: 2106

Alfa AF: 0.00104 Hom.: 0

Bravo AF: 0.00250

Asia WGS AF: 0.000577 AC: 2 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.85
CADD	Benign	5.5
DANN	Benign	0.62
PhyloP100		0.11

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: rs28683050; hg19: chr15-67378336;