rs387907284

Positions:

• chr15-66781288-C-G
• chr15-66781288-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 6P and 4B. PM1 PM5 PP3_Moderate BS2

The NM_005585.5(SMAD6):​c.1244C>G​(p.Pro415Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000964 in 1,452,380 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P415L) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000096 (0 hom.)
• Consequence: SMAD6 NM_005585.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.76

Genes affected

SMAD6 (HGNC:6772): (SMAD family member 6) The protein encoded by this gene belongs to the SMAD family of proteins, which are related to Drosophila 'mothers against decapentaplegic' (Mad) and C. elegans Sma. SMAD proteins are signal transducers and transcriptional modulators that mediate multiple signaling pathways. This protein functions in the negative regulation of BMP and TGF-beta/activin-signalling. Multiple transcript variants have been found for this gene.[provided by RefSeq, Sep 2014]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM1: In a domain MH2 (size 165) in uniprot entity SMAD6_HUMAN there are 9 pathogenic changes around while only 3 benign (75%) in NM_005585.5
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr15-66781288-C-T is described in Lovd as [Likely_pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.922
• BS2: High AC in GnomAdExome4 at 14 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SMAD6	NM_005585.5	c.1244C>G	p.Pro415Arg	missense_variant	4/4	ENST00000288840.10	NP_005576.3
SMAD6	XM_011521561.3	c.461C>G	p.Pro154Arg	missense_variant	4/4		XP_011519863.1
SMAD6	NR_027654.2	n.2399C>G		non_coding_transcript_exon_variant	5/5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SMAD6	ENST00000288840.10	c.1244C>G	p.Pro415Arg	missense_variant	4/4	1	NM_005585.5	ENSP00000288840	P1
SMAD6	ENST00000557916.5	c.*359C>G		3_prime_UTR_variant, NMD_transcript_variant	5/5	1		ENSP00000452955
SMAD6	ENST00000559931.5	c.*359C>G		3_prime_UTR_variant, NMD_transcript_variant	4/4	3		ENSP00000453446

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000860 AC: 2 AN: 232588 Hom.: 0 AF XY: 0.00000779 AC XY: 1 AN XY: 128336

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000659

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000964 AC: 14 AN: 1452380 Hom.: 0 Cov.: 34 AF XY: 0.0000111 AC XY: 8 AN XY: 722216

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: 0.000163

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ExAC AF: 0.0000168 AC: 2

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.92
BayesDel_addAF	Pathogenic	0.40	D
BayesDel_noAF	Pathogenic	0.51
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.96	D
Eigen	Pathogenic	0.75
Eigen_PC	Pathogenic	0.76
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.93	D
M_CAP	Pathogenic	0.49	D
MetaRNN	Pathogenic	0.92	D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Benign	1.6	L
MutationTaster	Benign	1.0	D;D
PrimateAI	Pathogenic	0.89	D
PROVEAN	Pathogenic	-6.6	D
REVEL	Pathogenic	0.87
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.0020	D
Polyphen		1.0	D
Vest4		0.92
MutPred		0.63		Loss of glycosylation at T416 (P = 0.0676);
MVP		0.96
MPC		0.93
ClinPred		0.80	D
GERP RS		5.6
Varity_R		0.88
gMVP		0.68

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

LitVar

Other links and lift over

dbSNP: rs387907284; hg19: chr15-67073626;