chrX-53394801-C-T

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 1P and 5B. PP2BP4_StrongBP6

The NM_006306.4(SMC1A):c.2950G>A(p.Gly984Ser) variant causes a missense change. The variant allele was found at a frequency of 0.00000846 in 1,182,200 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 1 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. 12/20 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 0.0000096 ( 0 hom., 0 hem., cov: 20)

Exomes 𝑓: 0.0000083 ( 0 hom. 1 hem. )

Consequence

SMC1A
NM_006306.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:2

Conservation

PhyloP100: 5.30

Variant links:

Genes affected

SMC1A (HGNC:11111): (structural maintenance of chromosomes 1A) Proper cohesion of sister chromatids is a prerequisite for the correct segregation of chromosomes during cell division. The cohesin multiprotein complex is required for sister chromatid cohesion. This complex is composed partly of two structural maintenance of chromosomes (SMC) proteins, SMC3 and either SMC1B or the protein encoded by this gene. Most of the cohesin complexes dissociate from the chromosomes before mitosis, although those complexes at the kinetochore remain. Therefore, the encoded protein is thought to be an important part of functional kinetochores. In addition, this protein interacts with BRCA1 and is phosphorylated by ATM, indicating a potential role for this protein in DNA repair. This gene, which belongs to the SMC gene family, is located in an area of the X-chromosome that escapes X inactivation. Mutations in this gene result in Cornelia de Lange syndrome. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Jul 2013]

SMC1A links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -4 ACMG points.

PP2

Missense variant in the SMC1A gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 68 curated pathogenic missense variants (we use a threshold of 10). The gene has 31 curated benign missense variants. Gene score misZ: 6.4479 (above the threshold of 3.09). GenCC associations: The gene is linked to Cornelia de Lange syndrome, X-linked complex neurodevelopmental disorder, atypical Rett syndrome, Cornelia de Lange syndrome 2, developmental and epileptic encephalopathy, 85, with or without midline brain defects.

BP4

Computational evidence support a benign effect (MetaRNN=0.057444155).

BP6

Variant X-53394801-C-T is Benign according to our data. Variant chrX-53394801-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 463884.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=2, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SMC1A	NM_006306.4 link	c.2950G>A	p.Gly984Ser	missense_variant	Exon 19 of 25	ENST00000322213.9	NP_006297.2	Q14683A0A384MR33Q68EN4
SMC1A	NM_001281463.1 link	c.2884G>A	p.Gly962Ser	missense_variant	Exon 20 of 26		NP_001268392.1	G8JLG1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SMC1A	ENST00000322213.9 link	c.2950G>A	p.Gly984Ser	missense_variant	Exon 19 of 25	1	NM_006306.4	ENSP00000323421.3		Q14683

Frequencies

GnomAD3 genomes

AF:

0.00000962

AC:

AN:

103938

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

26742

show subpopulations

Gnomad AFR

AF:

0.0000354

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000219

AC:

AN:

182884

Hom.:

AF XY:

0.00

AC XY:

AN XY:

67358

show subpopulations

Gnomad AFR exome

AF:

0.0000760

Gnomad AMR exome

AF:

0.0000729

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000524

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000835

AC:

AN:

1078262

Hom.:

Cov.:

AF XY:

0.00000289

AC XY:

AN XY:

346246

show subpopulations

Gnomad4 AFR exome

AF:

0.0000384

Gnomad4 AMR exome

AF:

0.0000854

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000186

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000364

Gnomad4 OTH exome

AF:

0.0000220

GnomAD4 genome

AF:

0.00000962

AC:

AN:

103938

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

26742

show subpopulations

Gnomad4 AFR

AF:

0.0000354

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000151

ExAC

AF:

0.0000494

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Oct 19, 2016

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.G984S variant (also known as c.2950G>A), located in coding exon 19 of the SMC1A gene, results from a G to A substitution at nucleotide position 2950. The glycine at codon 984 is replaced by serine, an amino acid with similar properties. This variant was not reported in population based cohorts in the following databases: Database of Single Nucleotide Polymorphisms (dbSNP), NHLBI Exome Sequencing Project (ESP), and 1000 Genomes Project. In the ESP, this variant was not observed in 6503 samples with coverage at this position. This amino acid position is not well conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this variant remains unclear. -

Congenital muscular hypertrophy-cerebral syndrome

Benign:1

Jun 03, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided

Benign:1

Feb 15, 2021

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.064

BayesDel_addAF

Benign

-0.41

BayesDel_noAF

Benign

-0.63

CADD

Benign

DANN

Benign

0.29

DEOGEN2

Benign

0.15

T;T

FATHMM_MKL

Benign

0.51

LIST_S2

Benign

0.83

T;T

M_CAP

Uncertain

0.22

MetaRNN

Benign

0.057

T;T

MetaSVM

Benign

-0.93

MutationAssessor

Benign

-2.4

N;.

PrimateAI

Uncertain

0.51

PROVEAN

Benign

2.3

N;.

REVEL

Benign

0.23

Sift

Benign

1.0

T;.

Sift4G

Benign

1.0

T;T

Polyphen

0.0

B;.

Vest4

0.034

MutPred

0.28

Loss of catalytic residue at G984 (P = 0.0473);.;

MVP

0.51

MPC

1.5

ClinPred

0.064

GERP RS

3.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.11

gMVP

0.13

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over