18-2732425-T-C

Variant names:

Variant summary

Our verdict is Benign. The variant received -11 ACMG points: 0P and 11B. BP4_ModerateBP6BS1BS2

The NM_015295.3(SMCHD1):c.3209T>C(p.Ile1070Thr) variant causes a missense change. The variant allele was found at a frequency of 0.000162 in 1,612,976 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00025 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00015 ( 0 hom. )

Consequence

SMCHD1
NM_015295.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:5B:2

Conservation

PhyloP100: 4.36

Publications

4 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:

ENSG00000266049 (HGNC:):

ENSG00000266049 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -11 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.17941585).

BP6

Variant 18-2732425-T-C is Benign according to our data. Variant chr18-2732425-T-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 286021.

BS1

Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.000249 (38/152330) while in subpopulation NFE AF = 0.000279 (19/68024). AF 95% confidence interval is 0.000182. There are 0 homozygotes in GnomAd4. There are 25 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High AC in GnomAd4 at 38 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_015295.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SMCHD1	NM_015295.3	MANE Select	c.3209T>C	p.Ile1070Thr	missense	Exon 25 of 48	NP_056110.2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
SMCHD1	ENST00000320876.11	TSL:5 MANE Select	c.3209T>C	p.Ile1070Thr	missense	Exon 25 of 48	ENSP00000326603.7
SMCHD1	ENST00000688342.1		c.3209T>C	p.Ile1070Thr	missense	Exon 25 of 47	ENSP00000508422.1
SMCHD1	ENST00000577880.5	TSL:2	n.1622T>C		non_coding_transcript_exon	Exon 14 of 38	ENSP00000463049.1

Frequencies

GnomAD3 genomes

AF:

0.000250

AC:

AN:

152212

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

Gnomad ASJ

AF:

0.000288

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00160

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000279

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000257

AC:

AN:

248742

AF XY:

0.000267

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000580

Gnomad ASJ exome

AF:

0.0000995

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00121

Gnomad NFE exome

AF:

0.000311

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000153

AC:

224

AN:

1460646

Hom.:

Cov.:

AF XY:

0.000157

AC XY:

114

AN XY:

726656

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33442

American (AMR)

AF:

0.000224

AC:

AN:

44720

Ashkenazi Jewish (ASJ)

AF:

0.0000383

AC:

AN:

26126

East Asian (EAS)

AF:

0.00

AC:

AN:

39624

South Asian (SAS)

AF:

0.0000116

AC:

AN:

86212

European-Finnish (FIN)

AF:

0.000937

AC:

AN:

53390

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5300

European-Non Finnish (NFE)

AF:

0.000145

AC:

161

AN:

1111526

Other (OTH)

AF:

0.0000166

AC:

AN:

60306

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.469

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000249

AC:

AN:

152330

Hom.:

Cov.:

AF XY:

0.000336

AC XY:

AN XY:

74498

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41566

American (AMR)

AF:

0.0000653

AC:

AN:

15306

Ashkenazi Jewish (ASJ)

AF:

0.000288

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5190

South Asian (SAS)

AF:

0.00

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.00160

AC:

AN:

10630

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000279

AC:

AN:

68024

Other (OTH)

AF:

0.00

AC:

AN:

2108

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.493

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000310

Hom.:

Bravo

AF:

0.000178

ExAC

AF:

0.000182

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.000491

EpiControl

AF:

0.000178

ClinVar

ClinVar submissions as Germline

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (3)

not specified (2)

Facioscapulohumeral muscular dystrophy 2 (1)

Scapulohumeral muscular dystrophy (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.33

BayesDel_addAF

Benign

-0.13

BayesDel_noAF

Benign

-0.12

CADD

Benign

(source)

DANN

Benign

0.95

DEOGEN2

Benign

0.089

Eigen

Uncertain

0.33

Eigen_PC

Uncertain

0.37

FATHMM_MKL

Uncertain

0.92

LIST_S2

Benign

0.85

M_CAP

Benign

0.035

MetaRNN

Benign

0.18

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.9

PhyloP100

4.4

PrimateAI

Uncertain

0.75

PROVEAN

Benign

-0.21

REVEL

Benign

0.18

Sift

Benign

0.59

Sift4G

Benign

1.0

Polyphen

0.99

Vest4

0.75

MVP

0.17

MPC

0.81

ClinPred

0.082

GERP RS

5.3

Varity_R

0.096

gMVP

0.42

Mutation Taster

=80/20

polymorphism

(source)

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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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

ClinVar submissions as Germline

Computational scores

Splicing

Publications

Other links and lift over