NM_006306.4:c.298+12T>C

Variant names:

Variant summary

Our verdict is Benign. The variant received -16 ACMG points: 0P and 16B. BP4_StrongBP6_Very_StrongBS2

The NM_006306.4(SMC1A):c.298+12T>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000248 in 1,208,521 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 6 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.000036 ( 0 hom., 0 hem., cov: 22)

Exomes 𝑓: 0.000024 ( 0 hom. 6 hem. )

Consequence

SMC1A
NM_006306.4 intron

Scores

Clinical Significance

Likely benign criteria provided, multiple submitters, no conflicts B:2

Conservation

PhyloP100: 1.08

Publications

0 publications found

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 Gene-Disease associations (from GenCC):

Cornelia de Lange syndrome 2
Inheritance: XL Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
developmental and epileptic encephalopathy, 85, with or without midline brain defects
Inheritance: XL Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
X-linked complex neurodevelopmental disorder
Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen
atypical Rett syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
Cornelia de Lange syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

SMC1A links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -16 ACMG points.

BP4

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

BP6

Variant X-53414969-A-G is Benign according to our data. Variant chrX-53414969-A-G is described in ClinVar as Likely_benign. ClinVar VariationId is 259963.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS2

High AC in GnomAdExome4 at 26 AD,XL gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SMC1A	NM_006306.4 link	c.298+12T>C		intron_variant	Intron 2 of 24	ENST00000322213.9	NP_006297.2	Q14683A0A384MR33Q68EN4
SMC1A	NM_001281463.1 link	c.232+12T>C		intron_variant	Intron 3 of 25		NP_001268392.1	G8JLG1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SMC1A	ENST00000322213.9 link	c.298+12T>C		intron_variant	Intron 2 of 24	1	NM_006306.4	ENSP00000323421.3		Q14683

Frequencies

GnomAD3 genomes

AF:

0.0000359

AC:

AN:

111409

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

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:

0.0000753

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000111

AC:

AN:

180932

AF XY:

0.0000153

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000248

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000237

AC:

AN:

1097112

Hom.:

Cov.:

AF XY:

0.0000166

AC XY:

AN XY:

362506

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

26380

American (AMR)

AF:

0.00

AC:

AN:

35159

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

19378

East Asian (EAS)

AF:

0.00

AC:

AN:

30193

South Asian (SAS)

AF:

0.00

AC:

AN:

54060

European-Finnish (FIN)

AF:

0.00

AC:

AN:

40325

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4134

European-Non Finnish (NFE)

AF:

0.0000297

AC:

AN:

841421

Other (OTH)

AF:

0.0000217

AC:

AN:

46062

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.473

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome 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

GnomAD4 genome

AF:

0.0000359

AC:

AN:

111409

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

33573

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

30617

American (AMR)

AF:

0.00

AC:

AN:

10417

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

2645

East Asian (EAS)

AF:

0.00

AC:

AN:

3554

South Asian (SAS)

AF:

0.00

AC:

AN:

2660

European-Finnish (FIN)

AF:

0.00

AC:

AN:

5990

Middle Eastern (MID)

AF:

0.00

AC:

AN:

240

European-Non Finnish (NFE)

AF:

0.0000753

AC:

AN:

53105

Other (OTH)

AF:

0.00

AC:

AN:

1499

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.438

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000378

ClinVar

Significance: Likely benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:1

PreventionGenetics, part of Exact Sciences

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Congenital muscular hypertrophy-cerebral syndrome

Benign:1

Sep 03, 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

-0.85

CADD

Benign

4.2

(source)

DANN

Benign

0.27

PhyloP100

1.1

Mutation Taster

=100/0

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over