rs369758530

chr18-2751290-G-Achr18-2751290-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The NM_015295.3(SMCHD1):c.4178G>A(p.Ser1393Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/23 in silico tools predict a benign 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. S1393T) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SMCHD1 NM_015295.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.84

Genes affected

SMCHD1 (HGNC:29090): (structural maintenance of chromosomes flexible hinge domain containing 1) This gene encodes a protein which contains a hinge region domain found in members of the SMC (structural maintenance of chromosomes) protein family. [provided by RefSeq, Dec 2011]

(HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, SMCHD1

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SMCHD1	NM_015295.3	c.4178G>A	p.Ser1393Asn	missense_variant	33/48	ENST00000320876.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SMCHD1	ENST00000320876.11	c.4178G>A	p.Ser1393Asn	missense_variant	33/48	5	NM_015295.3	P2
	ENST00000583546.1	n.370+57165C>T		intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 25

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.18
BayesDel_addAF	Benign	-0.32	T
BayesDel_noAF	Benign	-0.70
Cadd	Benign	22
Dann	Uncertain	0.98
DEOGEN2	Benign	0.10	T
Eigen	Benign	-0.38
Eigen_PC	Benign	-0.24
FATHMM_MKL	Benign	0.64	D
LIST_S2	Benign	0.65	T
M_CAP	Benign	0.0055	T
MetaRNN	Benign	0.081	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.8	L
MutationTaster	Benign	0.93	N;N
PrimateAI	Benign	0.40	T
PROVEAN	Benign	-0.77	N
REVEL	Benign	0.036
Sift	Benign	0.16	T
Sift4G	Benign	0.50	T
Polyphen		0.0	B
Vest4		0.24
MutPred		0.30		Loss of sheet (P = 0.0181);
MVP		0.068
MPC		0.20
ClinPred		0.13	T
GERP RS		2.2
Varity_R		0.045
gMVP		0.44

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.31		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.31		Position offset: 15

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs369758530; hg19: chr18-2751288;