dbSNP rs79829175: SMCHD1:c.3802-16T>G (chr18-2747506-T-G) – ACMG Classification: Benign (-20 pts)

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBA1

The NM_015295.3(SMCHD1):c.3802-16T>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00325 in 1,582,640 control chromosomes in the GnomAD database, including 138 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

Frequency

Genomes: 𝑓 0.017 ( 68 hom., cov: 32)

Exomes 𝑓: 0.0018 ( 70 hom. )

Consequence

SMCHD1
NM_015295.3 intron

Scores

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:4

Conservation

PhyloP100: 0.434

Publications

1 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 -20 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.85).

BP6

Variant 18-2747506-T-G is Benign according to our data. Variant chr18-2747506-T-G is described in ClinVar as Benign. ClinVar VariationId is 260645.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BA1

GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.0571 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SMCHD1	NM_015295.3 link	c.3802-16T>G		intron_variant	Intron 29 of 47	ENST00000320876.11	NP_056110.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SMCHD1	ENST00000320876.11 link	c.3802-16T>G		intron_variant	Intron 29 of 47	5	NM_015295.3	ENSP00000326603.7		A6NHR9-1

Frequencies

GnomAD3 genomes

AF:

0.0170

AC:

2591

AN:

152194

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0588

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00633

Gnomad NFE

AF:

0.000323

Gnomad OTH

AF:

0.0139

GnomAD2 exomes

AF:

0.00456

AC:

1069

AN:

234598

AF XY:

0.00352

show subpopulations

Gnomad AFR exome

AF:

0.0623

Gnomad AMR exome

AF:

0.00322

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000213

Gnomad OTH exome

AF:

0.00194

GnomAD4 exome

AF:

0.00178

AC:

2542

AN:

1430328

Hom.:

Cov.:

AF XY:

0.00158

AC XY:

1127

AN XY:

711922

show subpopulations

African (AFR)

AF:

0.0578

AC:

1862

AN:

32212

American (AMR)

AF:

0.00346

AC:

141

AN:

40748

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25222

East Asian (EAS)

AF:

0.0000255

AC:

AN:

39282

South Asian (SAS)

AF:

0.000171

AC:

AN:

82088

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52674

Middle Eastern (MID)

AF:

0.00655

AC:

AN:

5648

European-Non Finnish (NFE)

AF:

0.000232

AC:

254

AN:

1093326

Other (OTH)

AF:

0.00394

AC:

233

AN:

59128

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.477

Heterozygous variant carriers

193

290

386

483

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

128

192

256

320

<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:

0.0171

AC:

2606

AN:

152312

Hom.:

Cov.:

AF XY:

0.0165

AC XY:

1230

AN XY:

74492

show subpopulations

African (AFR)

AF:

0.0590

AC:

2453

AN:

41556

American (AMR)

AF:

0.00654

AC:

100

AN:

15300

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3468

East Asian (EAS)

AF:

0.00

AC:

AN:

5194

South Asian (SAS)

AF:

0.000207

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10624

Middle Eastern (MID)

AF:

0.00340

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000323

AC:

AN:

68026

Other (OTH)

AF:

0.0137

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.500

Heterozygous variant carriers

124

248

371

495

619

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

104

130

<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:

0.00695

Hom.:

Bravo

AF:

0.0189

Asia WGS

AF:

0.00636

AC:

AN:

3476

ClinVar

Significance: Benign

Submissions summary: Benign:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:2

Breakthrough Genomics, Breakthrough Genomics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:not provided

- -

May 23, 2021

GeneDx

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not specified

Benign:1

PreventionGenetics, part of Exact Sciences

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Facioscapulohumeral muscular dystrophy 2

Benign:1

Jan 30, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.85

CADD

Benign

(source)

DANN

Benign

0.50

PhyloP100

0.43

Mutation Taster

=100/0

polymorphism (auto)

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.090

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

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over