chr18-2750446-C-T

Variant names:

Variant summary

Our verdict is Benign. The variant received -19 ACMG points: 0P and 19B. BP4_ModerateBP6_Very_StrongBP7BS1BS2

The NM_015295.3(SMCHD1):c.4104C>T(p.Pro1368Pro) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00162 in 1,611,098 control chromosomes in the GnomAD database, including 27 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

Frequency

Genomes: 𝑓 0.0024 ( 5 hom., cov: 32)

Exomes 𝑓: 0.0015 ( 22 hom. )

Consequence

SMCHD1
NM_015295.3 synonymous

Scores

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:5

Conservation

PhyloP100: -1.29

Publications

3 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 -19 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.4).

BP6

Variant 18-2750446-C-T is Benign according to our data. Variant chr18-2750446-C-T is described in ClinVar as Benign. ClinVar VariationId is 260647.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=-1.29 with no splicing effect.

BS1

Variant frequency is greater than expected in population eas. GnomAd4 allele frequency = 0.00237 (360/152084) while in subpopulation EAS AF = 0.033 (171/5186). AF 95% confidence interval is 0.0289. There are 5 homozygotes in GnomAd4. There are 165 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High AC in GnomAd4 at 360 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.4104C>T	p.Pro1368Pro	synonymous	Exon 32 of 48	NP_056110.2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
SMCHD1	ENST00000320876.11	TSL:5 MANE Select	c.4104C>T	p.Pro1368Pro	synonymous	Exon 32 of 48	ENSP00000326603.7
SMCHD1	ENST00000688342.1		c.4104C>T	p.Pro1368Pro	synonymous	Exon 32 of 47	ENSP00000508422.1
SMCHD1	ENST00000577880.5	TSL:2	n.2517C>T		non_coding_transcript_exon	Exon 21 of 38	ENSP00000463049.1

Frequencies

GnomAD3 genomes

AF:

0.00236

AC:

359

AN:

151966

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00111

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00695

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.0329

Gnomad SAS

AF:

0.00415

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000883

Gnomad OTH

AF:

0.00481

GnomAD2 exomes

AF:

0.00474

AC:

1160

AN:

244746

AF XY:

0.00373

show subpopulations

Gnomad AFR exome

AF:

0.00147

Gnomad AMR exome

AF:

0.0154

Gnomad ASJ exome

AF:

0.000405

Gnomad EAS exome

AF:

0.0306

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000722

Gnomad OTH exome

AF:

0.00302

GnomAD4 exome

AF:

0.00154

AC:

2243

AN:

1459014

Hom.:

Cov.:

AF XY:

0.00142

AC XY:

1031

AN XY:

725652

show subpopulations

African (AFR)

AF:

0.000538

AC:

AN:

33428

American (AMR)

AF:

0.0147

AC:

650

AN:

44292

Ashkenazi Jewish (ASJ)

AF:

0.000154

AC:

AN:

26000

East Asian (EAS)

AF:

0.0288

AC:

1139

AN:

39580

South Asian (SAS)

AF:

0.00179

AC:

154

AN:

85928

European-Finnish (FIN)

AF:

0.0000375

AC:

AN:

53304

Middle Eastern (MID)

AF:

0.000696

AC:

AN:

5750

European-Non Finnish (NFE)

AF:

0.0000711

AC:

AN:

1110458

Other (OTH)

AF:

0.00320

AC:

193

AN:

60274

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.429

Heterozygous variant carriers

102

205

307

410

512

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

114

152

190

<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:

0.00237

AC:

360

AN:

152084

Hom.:

Cov.:

AF XY:

0.00222

AC XY:

165

AN XY:

74326

show subpopulations

African (AFR)

AF:

0.00111

AC:

AN:

41502

American (AMR)

AF:

0.00701

AC:

107

AN:

15272

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.0330

AC:

171

AN:

5186

South Asian (SAS)

AF:

0.00394

AC:

AN:

4818

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10570

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000883

AC:

AN:

67958

Other (OTH)

AF:

0.00523

AC:

AN:

2102

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.505

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

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:

0.00143

Hom.:

Bravo

AF:

0.00287

Asia WGS

AF:

0.0250

AC:

AN:

3478

ClinVar

Significance: Benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:3

Dec 07, 2015

Eurofins Ntd Llc (ga)

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

PreventionGenetics, part of Exact Sciences

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Jun 02, 2021

Athena Diagnostics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Facioscapulohumeral muscular dystrophy 2

Benign:1

Jan 28, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

not provided

Benign:1

Breakthrough Genomics, Breakthrough Genomics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:not provided

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.40

CADD

Benign

3.5

(source)

DANN

Benign

0.76

PhyloP100

-1.3

Mutation Taster

=98/2

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

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

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

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over