NM_006306.4:c.3663C>T

Variant names:

Variant summary

Our verdict is Benign. The variant received -21 ACMG points: 0P and 21B. BP4_StrongBP6_Very_StrongBP7BS1BS2

The NM_006306.4(SMC1A):c.3663C>T(p.Thr1221Thr) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000224 in 1,206,337 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 (★★). Synonymous variant affecting the same amino acid position (i.e. T1221T) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0000090 ( 0 hom., 0 hem., cov: 23)

Exomes 𝑓: 0.000024 ( 0 hom. 6 hem. )

Consequence

SMC1A
NM_006306.4 synonymous

Scores

Clinical Significance

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

Conservation

PhyloP100: 1.81

Publications

2 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 -21 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.57).

BP6

Variant X-53380142-G-A is Benign according to our data. Variant chrX-53380142-G-A is described in ClinVar as Likely_benign. ClinVar VariationId is 463886.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=1.81 with no splicing effect.

BS1

Variant frequency is greater than expected in population amr. GnomAdExome4 allele frequency = 0.0000237 (26/1095650) while in subpopulation AMR AF = 0.000597 (21/35195). AF 95% confidence interval is 0.000399. There are 0 homozygotes in GnomAdExome4. There are 6 alleles in the male GnomAdExome4 subpopulation. Median coverage is 28. This position passed quality control check.

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.3663C>T	p.Thr1221Thr	synonymous_variant	Exon 25 of 25	ENST00000322213.9	NP_006297.2	Q14683A0A384MR33Q68EN4
SMC1A	NM_001281463.1 link	c.3597C>T	p.Thr1199Thr	synonymous_variant	Exon 26 of 26		NP_001268392.1	G8JLG1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
SMC1A	ENST00000322213.9 link	c.3663C>T	p.Thr1221Thr	synonymous_variant	Exon 25 of 25	1	NM_006306.4	ENSP00000323421.3	Q14683
SMC1A	ENST00000375340.10 link	c.3597C>T	p.Thr1199Thr	synonymous_variant	Exon 26 of 26	1		ENSP00000364489.7	G8JLG1
SMC1A	ENST00000675504.1 link	c.3597C>T	p.Thr1199Thr	synonymous_variant	Exon 25 of 25			ENSP00000502524.1	G8JLG1
SMC1A	ENST00000674590.1 link	c.2895C>T	p.Thr965Thr	synonymous_variant	Exon 23 of 23			ENSP00000502626.1	A0A6Q8PHC3

Frequencies

GnomAD3 genomes

AF:

0.00000903

AC:

AN:

110687

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:

0.00

Gnomad OTH

AF:

0.000668

GnomAD2 exomes

AF:

0.000116

AC:

AN:

180454

AF XY:

0.0000606

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000731

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000125

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000237

AC:

AN:

1095650

Hom.:

Cov.:

AF XY:

0.0000166

AC XY:

AN XY:

361246

show subpopulations

African (AFR)

AF:

0.0000759

AC:

AN:

26364

American (AMR)

AF:

0.000597

AC:

AN:

35195

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

19204

East Asian (EAS)

AF:

0.00

AC:

AN:

30200

South Asian (SAS)

AF:

0.00

AC:

AN:

53826

European-Finnish (FIN)

AF:

0.00

AC:

AN:

40513

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4074

European-Non Finnish (NFE)

AF:

0.00000119

AC:

AN:

840290

Other (OTH)

AF:

0.0000435

AC:

AN:

45984

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.478

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:

0.00000903

AC:

AN:

110687

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

32893

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

30420

American (AMR)

AF:

0.00

AC:

AN:

10347

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

2636

East Asian (EAS)

AF:

0.00

AC:

AN:

3530

South Asian (SAS)

AF:

0.00

AC:

AN:

2581

European-Finnish (FIN)

AF:

0.00

AC:

AN:

5880

Middle Eastern (MID)

AF:

0.00

AC:

AN:

234

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

52883

Other (OTH)

AF:

0.000668

AC:

AN:

1496

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

Age Distribution

Genome Het

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:

0.00

Hom.:

Bravo

AF:

0.0000340

ClinVar

Significance: Likely benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Congenital muscular hypertrophy-cerebral syndrome

Benign:1

Nov 07, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Benign:1

Dec 02, 2020

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

BayesDel_noAF

Benign

-0.57

CADD

Benign

8.7

(source)

DANN

Benign

0.70

PhyloP100

1.8

Mutation Taster

=100/0

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.18

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