18-48924703-C-G

Variant names:

• chr18-48924703-C-G
• rs34007497
• NM_005904.4:c.743-2793G>C

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_005904.4(SMAD7):​c.743-2793G>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.388 in 152,036 control chromosomes in the GnomAD database, including 11,772 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 0.39 (11772 hom., cov: 32)
• Consequence: SMAD7 NM_005904.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.0180
• Publications: 9 publications found

Genes affected

SMAD7 (HGNC:6773): (SMAD family member 7) The protein encoded by this gene is a nuclear protein that binds the E3 ubiquitin ligase SMURF2. Upon binding, this complex translocates to the cytoplasm, where it interacts with TGF-beta receptor type-1 (TGFBR1), leading to the degradation of both the encoded protein and TGFBR1. Expression of this gene is induced by TGFBR1. Variations in this gene are a cause of susceptibility to colorectal cancer type 3 (CRCS3). Several transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jun 2010]

SMAD7 Gene-Disease associations (from GenCC):

• colorectal cancer, susceptibility to, 3

  Inheritance: AD Classification: LIMITED Submitted by: PanelApp Australia
• congenital heart disease

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.81).
• BA1: GnomAd4 highest subpopulation (NFE) allele frequency at 95% confidence interval = 0.429 is higher than 0.05.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005904.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SMAD7	NM_005904.4	MANE Select	c.743-2793G>C		intron	N/A	NP_005895.1	O15105-1
	SMAD7	NM_001190821.2		c.740-2793G>C		intron	N/A	NP_001177750.1	O15105-3
	SMAD7	NM_001190823.2		c.179-2793G>C		intron	N/A	NP_001177752.1	B3KYA8

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SMAD7	ENST00000262158.8	TSL:1 MANE Select	c.743-2793G>C		intron	N/A	ENSP00000262158.2	O15105-1
	SMAD7	ENST00000589634.1	TSL:4	c.740-2793G>C		intron	N/A	ENSP00000467621.1	O15105-3
	SMAD7	ENST00000911789.1		c.668-2793G>C		intron	N/A	ENSP00000581848.1

Frequencies

GnomAD3 genomes AF: 0.388 AC: 58973 AN: 151918 Hom.: 11773 Cov.: 32

Gnomad AFR AF: 0.350

Gnomad AMI AF: 0.469

Gnomad AMR AF: 0.344

Gnomad ASJ AF: 0.503

Gnomad EAS AF: 0.298

Gnomad SAS AF: 0.251

Gnomad FIN AF: 0.366

Gnomad MID AF: 0.443

Gnomad NFE AF: 0.434

Gnomad OTH AF: 0.420

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

GnomAD4 genome AF: 0.388 AC: 58985 AN: 152036 Hom.: 11772 Cov.: 32 AF XY: 0.379 AC XY: 28146 AN XY: 74278

African (AFR) AF: 0.350 AC: 14499 AN: 41478

American (AMR) AF: 0.343 AC: 5242 AN: 15282

Ashkenazi Jewish (ASJ) AF: 0.503 AC: 1746 AN: 3470

East Asian (EAS) AF: 0.298 AC: 1534 AN: 5156

South Asian (SAS) AF: 0.250 AC: 1202 AN: 4812

European-Finnish (FIN) AF: 0.366 AC: 3870 AN: 10582

Middle Eastern (MID) AF: 0.466 AC: 137 AN: 294

European-Non Finnish (NFE) AF: 0.434 AC: 29453 AN: 67940

Other (OTH) AF: 0.414 AC: 875 AN: 2112

Alfa AF: 0.264 Hom.: 627

Bravo AF: 0.387

Asia WGS AF: 0.267 AC: 931 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.81
CADD	Benign	7.9
DANN	Benign	0.71
PhyloP100		-0.018
Mutation Taster		=100/0	polymorphism (auto)

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: rs34007497; hg19: chr18-46451073;