chr18-48941881-T-C

Variant names:

• chr18-48941881-T-C
• rs1873191
• NM_005904.4:c.742+600A>G

Variant summary

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

The NM_005904.4(SMAD7):​c.742+600A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.253 in 152,030 control chromosomes in the GnomAD database, including 5,761 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 0.25 (5761 hom., cov: 32)
• Consequence: SMAD7 NM_005904.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.16
• Publications: 7 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]

ACMG classification

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

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.9).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.388 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SMAD7	NM_005904.4	c.742+600A>G		intron_variant	Intron 3 of 3	ENST00000262158.8	NP_005895.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SMAD7	ENST00000262158.8	c.742+600A>G		intron_variant	Intron 3 of 3	1	NM_005904.4	ENSP00000262158.2

Frequencies

GnomAD3 genomes AF: 0.254 AC: 38529 AN: 151912 Hom.: 5762 Cov.: 32

Gnomad AFR AF: 0.102

Gnomad AMI AF: 0.248

Gnomad AMR AF: 0.287

Gnomad ASJ AF: 0.321

Gnomad EAS AF: 0.404

Gnomad SAS AF: 0.199

Gnomad FIN AF: 0.361

Gnomad MID AF: 0.244

Gnomad NFE AF: 0.311

Gnomad OTH AF: 0.268

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

GnomAD4 genome AF: 0.253 AC: 38538 AN: 152030 Hom.: 5761 Cov.: 32 AF XY: 0.257 AC XY: 19091 AN XY: 74312

African (AFR) AF: 0.102 AC: 4215 AN: 41494

American (AMR) AF: 0.287 AC: 4386 AN: 15258

Ashkenazi Jewish (ASJ) AF: 0.321 AC: 1113 AN: 3466

East Asian (EAS) AF: 0.403 AC: 2070 AN: 5140

South Asian (SAS) AF: 0.201 AC: 967 AN: 4822

European-Finnish (FIN) AF: 0.361 AC: 3809 AN: 10560

Middle Eastern (MID) AF: 0.241 AC: 71 AN: 294

European-Non Finnish (NFE) AF: 0.311 AC: 21114 AN: 67976

Other (OTH) AF: 0.269 AC: 567 AN: 2110

Alfa AF: 0.295 Hom.: 9253

Bravo AF: 0.248

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.90
CADD	Benign	0.53
DANN	Benign	0.33
PhyloP100		-1.2
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: rs1873191; hg19: chr18-46468251;