18-51078285-G-C

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1 PM2 PP2 PP3_Moderate PP5

The NM_005359.6(SMAD4):c.1477G>C(p.Asp493His) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (no stars). Synonymous variant affecting the same amino acid position (i.e. D493D) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SMAD4 NM_005359.6 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 9.79

Genes affected

SMAD4 (HGNC:6770): (SMAD family member 4) This gene encodes a member of the Smad family of signal transduction proteins. Smad proteins are phosphorylated and activated by transmembrane serine-threonine receptor kinases in response to transforming growth factor (TGF)-beta signaling. The product of this gene forms homomeric complexes and heteromeric complexes with other activated Smad proteins, which then accumulate in the nucleus and regulate the transcription of target genes. This protein binds to DNA and recognizes an 8-bp palindromic sequence (GTCTAGAC) called the Smad-binding element (SBE). The protein acts as a tumor suppressor and inhibits epithelial cell proliferation. It may also have an inhibitory effect on tumors by reducing angiogenesis and increasing blood vessel hyperpermeability. The encoded protein is a crucial component of the bone morphogenetic protein signaling pathway. The Smad proteins are subject to complex regulation by post-translational modifications. Mutations or deletions in this gene have been shown to result in pancreatic cancer, juvenile polyposis syndrome, and hereditary hemorrhagic telangiectasia syndrome. [provided by RefSeq, May 2022]

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 11 uncertain in NM_005359.6
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, SMAD4
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.935
• PP5: Variant 18-51078285-G-C is Pathogenic according to our data. Variant chr18-51078285-G-C is described in ClinVar as [Pathogenic]. Clinvar id is 8538.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SMAD4	NM_005359.6	c.1477G>C	p.Asp493His	missense_variant	12/12	ENST00000342988.8
SMAD4	NM_001407041.1	c.1477G>C	p.Asp493His	missense_variant	12/12
SMAD4	NM_001407042.1	c.1477G>C	p.Asp493His	missense_variant	12/12
SMAD4	NR_176265.1	n.2128G>C		non_coding_transcript_exon_variant	13/13

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SMAD4	ENST00000342988.8	c.1477G>C	p.Asp493His	missense_variant	12/12	5	NM_005359.6	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Carcinoma of pancreas Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Jun 01, 1996

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.54	D
BayesDel_noAF	Pathogenic	0.53
Cadd	Pathogenic	30
Dann	Uncertain	0.99
DEOGEN2	Pathogenic	0.99	D;D;D
Eigen	Pathogenic	0.94
Eigen_PC	Pathogenic	0.94
FATHMM_MKL	Pathogenic	1.0	D
M_CAP	Pathogenic	0.80	D
MetaRNN	Pathogenic	0.93	D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Uncertain	2.7	M;M;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Pathogenic	0.88	D
PROVEAN	Pathogenic	-6.6	D;D;.
REVEL	Pathogenic	0.93
Sift	Uncertain	0.0050	D;D;.
Sift4G	Uncertain	0.052	T;T;T
Polyphen		0.98	D;D;.
Vest4		0.84
MutPred		0.66		Loss of helix (P = 0.0167);Loss of helix (P = 0.0167);.;
MVP		0.98
MPC		3.1
ClinPred		0.98	D
GERP RS		6.0
Varity_R		0.95
gMVP		0.94

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: rs121912578; hg19: chr18-48604655; COSMIC: COSV61683964; COSMIC: COSV61683964;