rs769401596

chr18-2656090-C-Achr18-2656090-C-Gchr18-2656090-C-T

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 3P and 4B. PM2PP2BP4_Strong

The NM_015295.3(SMCHD1):c.15C>A(p.Asp5Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000016 in 1,249,600 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. D5D) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000016 ( 0 hom. )

Consequence

SMCHD1
NM_015295.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.172

Variant links:

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]

SMCHD1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP2

Missense variant where missense usually causes diseases, SMCHD1

BP4

Computational evidence support a benign effect (MetaRNN=0.03888157).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SMCHD1	NM_015295.3 linkuse as main transcript	c.15C>A	p.Asp5Glu	missense_variant	1/48	ENST00000320876.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SMCHD1	ENST00000320876.11 linkuse as main transcript	c.15C>A	p.Asp5Glu	missense_variant	1/48	5	NM_015295.3	P2	A6NHR9-1
SMCHD1	ENST00000688342.1 linkuse as main transcript	c.15C>A	p.Asp5Glu	missense_variant	1/47			A2
SMCHD1	ENST00000684915.1 linkuse as main transcript	n.172C>A		non_coding_transcript_exon_variant	1/14

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.0000121

AC:

AN:

82516

Hom.:

AF XY:

0.00

AC XY:

AN XY:

46084

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000219

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000160

AC:

AN:

1249600

Hom.:

Cov.:

AF XY:

0.00000164

AC XY:

AN XY:

610596

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000674

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000336

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Facioscapulohumeral muscular dystrophy 2

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Oct 17, 2022

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Not Available"; Align-GVGD: "Class C0"). ClinVar contains an entry for this variant (Variation ID: 464163). This variant has not been reported in the literature in individuals affected with SMCHD1-related conditions. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This sequence change replaces aspartic acid, which is acidic and polar, with glutamic acid, which is acidic and polar, at codon 5 of the SMCHD1 protein (p.Asp5Glu). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.086

BayesDel_addAF

Benign

-0.36

BayesDel_noAF

Benign

-0.75

Cadd

Benign

Dann

Benign

0.91

DEOGEN2

Benign

0.053

Eigen

Benign

-0.80

Eigen_PC

Benign

-0.73

FATHMM_MKL

Benign

0.20

LIST_S2

Benign

0.40

M_CAP

Benign

0.044

MetaRNN

Benign

0.039

MetaSVM

Benign

-0.99

MutationAssessor

Benign

0.0

MutationTaster

Benign

1.0

N;N

PrimateAI

Uncertain

0.70

PROVEAN

Benign

-0.21

REVEL

Benign

0.024

Sift

Benign

0.65

Sift4G

Benign

0.98

Polyphen

0.048

Vest4

0.027

MutPred

0.25

Gain of sheet (P = 0.1945);

MVP

0.12

MPC

0.61

ClinPred

0.040

GERP RS

1.8

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

2.3

Varity_R

0.088

gMVP

0.099

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over