chr18-51065553-T-C
Variant summary
Our verdict is Benign. Variant got -19 ACMG points: 0P and 19B. BP4_ModerateBP6_Very_StrongBP7BS1BS2
The NM_005359.6(SMAD4):āc.1086T>Cā(p.Phe362Phe) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00144 in 1,614,186 control chromosomes in the GnomAD database, including 13 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (ā ā ).
Frequency
Consequence
NM_005359.6 synonymous
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Benign. Variant got -19 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | MANE | Protein | UniProt |
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SMAD4 | NM_005359.6 | c.1086T>C | p.Phe362Phe | synonymous_variant | Exon 9 of 12 | ENST00000342988.8 | NP_005350.1 |
Ensembl
Frequencies
GnomAD3 genomes AF: 0.00222 AC: 338AN: 152210Hom.: 1 Cov.: 32
GnomAD3 exomes AF: 0.00182 AC: 457AN: 251414Hom.: 3 AF XY: 0.00182 AC XY: 247AN XY: 135886
GnomAD4 exome AF: 0.00135 AC: 1980AN: 1461858Hom.: 12 Cov.: 31 AF XY: 0.00134 AC XY: 976AN XY: 727228
GnomAD4 genome AF: 0.00223 AC: 340AN: 152328Hom.: 1 Cov.: 32 AF XY: 0.00224 AC XY: 167AN XY: 74488
ClinVar
Submissions by phenotype
not specified Benign:8
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This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -
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not provided Benign:7
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Variant summary: The c.1086T>C in SMAD4 gene is a synonymous change that involves a conserved nucleotide. 5/5 programs in Alamut predict that this variant does not affect normal splicing, however no functional studies supporting this notion were published at the time of evaluation. The variant was found in multiple affected individuals presented with personal and/or family history of cancer. It is present in the control population dataset of ExAC at frequency of 0.17%, including 2 homozygous occurrences. The observed frequency exceeds the maximum expected allele frequency for a pathogenic SMAD4 variant, suggesting that it is a common polymorphism. However, some of these occurrences may potentially be due to a presence of a processed pseudogene, and, therefore, should be taken with cautions. Lastly, the variant has been reported as Likely Benign/Benign by reputable databases/clinical laboratories. Taken together, this variant has been classified as Benign. -
SMAD4: BP4, BS1 -
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Myhre syndrome Benign:2
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This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -
Generalized juvenile polyposis/juvenile polyposis coli Benign:2
This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -
The SMAD4 p.Phe362= variant was identified in 2 of 1004 proband chromosomes (frequency: 0.002) from individuals or families with gastric or breast cancer and was present in 1 of 1420 control chromosomes (frequency: 0.001) from healthy individuals (Oliveira 2003, Tram 2011). The variant was also identified in dbSNP (ID: rs1801250) as "With other allele", ClinVar (classified as benign by Invitae, GeneDx, Color and ARUP; and as likely benign by Ambry Genetics and two other submitters), and in LOVD 3.0 (3x as benign or likely benign). The variant was identified in control databases in 502 of 277188 chromosomes (3 homozygous) at a frequency of 0.002, increasing the likelihood this could be a low frequency benign variant (Genome Aggregation Database Feb 27, 2017). The variant was observed in the following populations: African in 84 of 24028 chromosomes (freq: 0.003), Other in 28 of 6466 chromosomes (freq: 0.004), Latino in 103 of 34412 chromosomes (freq: 0.003), European in 133 of 126694 chromosomes (freq: 0.001), Ashkenazi Jewish in 149 of 10150 chromosomes (freq: 0.02), and South Asian in 5 of 30782 chromosomes (freq: 0.0002), while the variant was not observed in the East Asian or Finnish populations. The p.Phe362= variant is not expected to have clinical significance because it does not result in a change of amino acid and is not located in a known consensus splice site. In addition, in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer) do not predict a difference in splicing. In summary, based on the above information, the clinical significance of this variant cannot be determined with certainty at this time although we would lean towards a more benign role for this variant. This variant is classified as likely benign. -
Hereditary cancer-predisposing syndrome Benign:2
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Juvenile polyposis syndrome Benign:2
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Familial thoracic aortic aneurysm and aortic dissection Benign:1
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Hereditary cancer-predisposing syndrome;C4707243:Familial thoracic aortic aneurysm and aortic dissection Benign:1
This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -
Juvenile polyposis/hereditary hemorrhagic telangiectasia syndrome Benign:1
This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at