18-2656112-T-G

Variant names:

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_StrongBS1_SupportingBS2

The NM_015295.3(SMCHD1):c.37T>G(p.Ser13Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000968 in 1,446,748 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S13F) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000077 ( 0 hom. )

Consequence

SMCHD1
NM_015295.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:5

Conservation

PhyloP100: 0.0540

Publications

2 publications found

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 Gene-Disease associations (from GenCC):

arhinia, choanal atresia, and microphthalmia
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), PanelApp Australia, G2P, Ambry Genetics, ClinGen, Illumina
facioscapulohumeral muscular dystrophy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
hyposmia-nasal and ocular hypoplasia-hypogonadotropic hypogonadism syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

SMCHD1 links:

ENSG00000293256 (HGNC:):

ENSG00000293256 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.020646185).

BS1

Variant frequency is greater than expected in population amr. GnomAdExome4 allele frequency = 0.00000772 (10/1294678) while in subpopulation AMR AF = 0.000428 (8/18700). AF 95% confidence interval is 0.000213. There are 0 homozygotes in GnomAdExome4. There are 5 alleles in the male GnomAdExome4 subpopulation. Median coverage is 29. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High AC in GnomAdExome4 at 10 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SMCHD1	NM_015295.3 link	c.37T>G	p.Ser13Ala	missense_variant	Exon 1 of 48	ENST00000320876.11	NP_056110.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
SMCHD1	ENST00000320876.11 link	c.37T>G	p.Ser13Ala	missense_variant	Exon 1 of 48	5	NM_015295.3	ENSP00000326603.7	A6NHR9-1
SMCHD1	ENST00000688342.1 link	c.37T>G	p.Ser13Ala	missense_variant	Exon 1 of 47			ENSP00000508422.1	A0A8I5KRS9
SMCHD1	ENST00000684915.1 link	n.194T>G		non_coding_transcript_exon_variant	Exon 1 of 14
ENSG00000293256	ENST00000733457.1 link	n.-242A>C		upstream_gene_variant

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152070

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000196

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.0000942

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000584

AC:

AN:

119960

AF XY:

0.0000446

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000708

Gnomad ASJ exome

AF:

0.00

Gnomad EAS 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:

0.00000772

AC:

AN:

1294678

Hom.:

Cov.:

AF XY:

0.00000785

AC XY:

AN XY:

637310

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

25922

American (AMR)

AF:

0.000428

AC:

AN:

18700

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

19588

East Asian (EAS)

AF:

0.00

AC:

AN:

30872

South Asian (SAS)

AF:

0.00

AC:

AN:

62962

European-Finnish (FIN)

AF:

0.0000210

AC:

AN:

47716

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5152

European-Non Finnish (NFE)

AF:

9.70e-7

AC:

AN:

1031254

Other (OTH)

AF:

0.00

AC:

AN:

52512

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.420

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.0000263

AC:

AN:

152070

Hom.:

Cov.:

AF XY:

0.0000404

AC XY:

AN XY:

74298

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41412

American (AMR)

AF:

0.000196

AC:

AN:

15288

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3466

East Asian (EAS)

AF:

0.00

AC:

AN:

5174

South Asian (SAS)

AF:

0.00

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.0000942

AC:

AN:

10612

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

67970

Other (OTH)

AF:

0.00

AC:

AN:

2092

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000567

ExAC

AF:

0.0000918

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Mar 21, 2017

Eurofins Ntd Llc (ga)

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Oct 14, 2022

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Facioscapulohumeral muscular dystrophy 2

Uncertain:1

Jun 13, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces serine, which is neutral and polar, with alanine, which is neutral and non-polar, at codon 13 of the SMCHD1 protein (p.Ser13Ala). This variant is present in population databases (rs751463286, gnomAD 0.08%). This variant has not been reported in the literature in individuals affected with SMCHD1-related conditions. ClinVar contains an entry for this variant (Variation ID: 500900). Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. 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. -

Inborn genetic diseases

Uncertain:1

Mar 07, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.37T>G (p.S13A) alteration is located in exon 1 (coding exon 1) of the SMCHD1 gene. This alteration results from a T to G substitution at nucleotide position 37, causing the serine (S) at amino acid position 13 to be replaced by an alanine (A). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

SMCHD1-related disorder

Uncertain:1

Jul 09, 2023

PreventionGenetics, part of Exact Sciences

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The SMCHD1 c.37T>G variant is predicted to result in the amino acid substitution p.Ser13Ala. To our knowledge, this variant has not been reported in the literature. This variant is reported in 0.075% of alleles in individuals of Latino descent in gnomAD (http://gnomad.broadinstitute.org/variant/18-2656111-T-G). At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.053

BayesDel_addAF

Benign

-0.44

BayesDel_noAF

Benign

-0.50

CADD

Benign

(source)

DANN

Benign

0.96

DEOGEN2

Benign

0.064

Eigen

Benign

-0.49

Eigen_PC

Benign

-0.42

FATHMM_MKL

Benign

0.092

LIST_S2

Benign

0.30

M_CAP

Benign

0.084

MetaRNN

Benign

0.021

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.5

PhyloP100

0.054

PrimateAI

Uncertain

0.77

PROVEAN

Benign

-0.25

REVEL

Benign

0.034

Sift

Benign

0.10

Sift4G

Benign

0.28

Polyphen

0.13

Vest4

0.22

MutPred

0.31

Gain of sheet (P = 0.0149);

MVP

0.082

MPC

0.54

ClinPred

0.12

GERP RS

3.5

PromoterAI

0.011

Neutral

(source)

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.8

Varity_R

0.18

gMVP

0.17

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

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18-2656112-T-G

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over