Genetic Variant SMCHD1:p.Gly8Gly (chr18-2656099-G-A) – ACMG Classification: Likely_benign (-4 pts)

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 2P and 6B. PM2BP4_StrongBP6_Moderate

The NM_015295.3(SMCHD1):c.24G>A(p.Gly8Gly) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000792 in 1,262,354 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★). Synonymous variant affecting the same amino acid position (i.e. G8G) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 7.9e-7 ( 0 hom. )

Consequence

SMCHD1
NM_015295.3 synonymous

Scores

Clinical Significance

Likely benign criteria provided, single submitter B:1

Conservation

PhyloP100: 0.486

Publications

0 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: Likely_benign. The variant received -4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.83).

BP6

Variant 18-2656099-G-A is Benign according to our data. Variant chr18-2656099-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 3674677.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SMCHD1	NM_015295.3 link	c.24G>A	p.Gly8Gly	synonymous_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.24G>A	p.Gly8Gly	synonymous_variant	Exon 1 of 48	5	NM_015295.3	ENSP00000326603.7	A6NHR9-1
SMCHD1	ENST00000688342.1 link	c.24G>A	p.Gly8Gly	synonymous_variant	Exon 1 of 47			ENSP00000508422.1	A0A8I5KRS9
SMCHD1	ENST00000684915.1 link	n.181G>A		non_coding_transcript_exon_variant	Exon 1 of 14
ENSG00000293256	ENST00000733457.1 link	n.-229C>T		upstream_gene_variant

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

7.92e-7

AC:

AN:

1262354

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

618260

show subpopulations

African (AFR)

AF:

0.0000394

AC:

AN:

25364

American (AMR)

AF:

0.00

AC:

AN:

15764

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

18264

East Asian (EAS)

AF:

0.00

AC:

AN:

30176

South Asian (SAS)

AF:

0.00

AC:

AN:

57862

European-Finnish (FIN)

AF:

0.00

AC:

AN:

44866

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4994

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1014222

Other (OTH)

AF:

0.00

AC:

AN:

50842

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Facioscapulohumeral muscular dystrophy 2

Benign:1

Apr 06, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely 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

-0.83

CADD

Benign

(source)

DANN

Benign

0.82

PhyloP100

0.49

PromoterAI

-0.17

Neutral

(source)

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.2

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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18-2656099-G-A

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over