chr18-51078285-G-C
Variant summary
Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1PM2PP2PP3_ModeratePP5
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
NM_005359.6 missense
Scores
13
4
1
Clinical Significance
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]
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ACMG classification
Classification made for transcript
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
GnomAD3 genomes
?
Cov.:
32
GnomAD4 exome Cov.: 31
GnomAD4 exome
Cov.:
31
GnomAD4 genome ? Cov.: 32
GnomAD4 genome
?
Cov.:
32
ClinVar
Significance: Pathogenic
Submissions summary: Pathogenic:1
Revision: no assertion criteria provided
LINK: link
Submissions by phenotype
Carcinoma of pancreas Pathogenic:1
Pathogenic, no assertion criteria provided | literature only | OMIM | Jun 01, 1996 | - - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Pathogenic
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
Cadd
Pathogenic
Dann
Uncertain
DEOGEN2
Pathogenic
D;D;D
Eigen
Pathogenic
Eigen_PC
Pathogenic
FATHMM_MKL
Pathogenic
D
M_CAP
Pathogenic
D
MetaRNN
Pathogenic
D;D;D
MetaSVM
Pathogenic
D
MutationAssessor
Uncertain
M;M;.
MutationTaster
Benign
D;D;D
PrimateAI
Pathogenic
D
PROVEAN
Pathogenic
D;D;.
REVEL
Pathogenic
Sift
Uncertain
D;D;.
Sift4G
Uncertain
T;T;T
Polyphen
D;D;.
Vest4
MutPred
Loss of helix (P = 0.0167);Loss of helix (P = 0.0167);.;
MVP
MPC
3.1
ClinPred
D
GERP RS
Varity_R
gMVP
Splicing
Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at