18-48949992-G-T

Position:

• chr18-48949992-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_005904.4(SMAD7):​c.433C>A​(p.Gln145Lys) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: SMAD7 NM_005904.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.08

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

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.30833495).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SMAD7	NM_005904.4	c.433C>A	p.Gln145Lys	missense_variant	1/4	ENST00000262158.8
SMAD7	NM_001190821.2	c.433C>A	p.Gln145Lys	missense_variant	1/4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SMAD7	ENST00000262158.8	c.433C>A	p.Gln145Lys	missense_variant	1/4	1	NM_005904.4	P4
SMAD7	ENST00000589634.1	c.433C>A	p.Gln145Lys	missense_variant	1/4	4		A1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 0.00000209 AC: 3 AN: 1434888 Hom.: 0 Cov.: 32 AF XY: 0.00000420 AC XY: 3 AN XY: 713614

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000273

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 13, 2023

The c.433C>A (p.Q145K) alteration is located in exon 1 (coding exon 1) of the SMAD7 gene. This alteration results from a C to A substitution at nucleotide position 433, causing the glutamine (Q) at amino acid position 145 to be replaced by a lysine (K). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.14
BayesDel_addAF	Uncertain	0.057	T
BayesDel_noAF	Benign	-0.16
CADD	Benign	22
DANN	Benign	0.94
DEOGEN2	Uncertain	0.49	T;.
Eigen	Benign	-0.25
Eigen_PC	Benign	-0.040
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Benign	0.65	T;T
M_CAP	Pathogenic	0.40	D
MetaRNN	Benign	0.31	T;T
MetaSVM	Benign	-0.37	T
MutationAssessor	Benign	1.9	L;L
MutationTaster	Benign	0.52	N;N
PrimateAI	Uncertain	0.76	T
PROVEAN	Benign	0.13	N;.
REVEL	Benign	0.25
Sift	Benign	0.11	T;.
Sift4G	Benign	0.53	T;T
Polyphen		0.0	B;.
Vest4		0.30
MutPred		0.47		Gain of methylation at Q145 (P = 0.0117);Gain of methylation at Q145 (P = 0.0117);
MVP		0.73
MPC		1.4
ClinPred		0.52	D
GERP RS		4.5
Varity_R		0.28
gMVP		0.38

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr18-46476362;