chrX-53375216-A-G

Variant names:

• chrX-53375216-A-G
• rs142173620
• NM_006306.4:c.*4887T>C

Variant summary

Our verdict is Benign. The variant received -14 ACMG points: 0P and 14B. BP4_Strong BP6_Moderate BS1 BS2

The NM_006306.4(SMC1A):​c.*4887T>C variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00304 in 112,297 control chromosomes in the GnomAD database, including 2 homozygotes. There are 99 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

• Frequency:
  • Genomes: 𝑓 0.0030 (2 hom., 99 hem., cov: 23)
  • Exomes 𝑓: 0.0 (0 hom. 0 hem.)
  • Failed GnomAD Quality Control
• Consequence: SMC1A NM_006306.4 3_prime_UTR
• Clinical Significance: Benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.954
• Publications: 0 publications found

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

ACMG classification

Our verdict: Benign. The variant received -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.84).
• BP6: Variant X-53375216-A-G is Benign according to our data. Variant chrX-53375216-A-G is described in ClinVar as [Benign]. Clinvar id is 915027.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS1: Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00304 (341/112297) while in subpopulation AFR AF = 0.0105 (324/30922). AF 95% confidence interval is 0.00954. There are 2 homozygotes in GnomAd4. There are 99 alleles in the male GnomAd4 subpopulation. Median coverage is 23. This position passed quality control check.
• BS2: High AC in GnomAd4 at 341 AD,XL gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SMC1A	NM_006306.4	c.*4887T>C		3_prime_UTR_variant	Exon 25 of 25	ENST00000322213.9	NP_006297.2
SMC1A	NM_001281463.1	c.*4887T>C		3_prime_UTR_variant	Exon 26 of 26		NP_001268392.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SMC1A	ENST00000322213.9	c.*4887T>C		3_prime_UTR_variant	Exon 25 of 25	1	NM_006306.4	ENSP00000323421.3
SMC1A	ENST00000375340.10	c.*4887T>C		3_prime_UTR_variant	Exon 26 of 26	1		ENSP00000364489.7
SMC1A	ENST00000675504.1	c.*4887T>C		3_prime_UTR_variant	Exon 25 of 25			ENSP00000502524.1

Frequencies

GnomAD3 genomes AF: 0.00305 AC: 342 AN: 112244 Hom.: 2 Cov.: 23

Gnomad AFR AF: 0.0105

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00104

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: 0.0000188

Gnomad OTH AF: 0.00330

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 36 Hom.: 0 Cov.: 0 AF XY: 0.00 AC XY: 0 AN XY: 18

African (AFR) AF: 0.00 AC: 0 AN: 2

American (AMR) AC: 0 AN: 0

Ashkenazi Jewish (ASJ) AC: 0 AN: 0

East Asian (EAS) AC: 0 AN: 0

South Asian (SAS) AC: 0 AN: 0

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 2

Middle Eastern (MID) AC: 0 AN: 0

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 30

Other (OTH) AF: 0.00 AC: 0 AN: 2

GnomAD4 genome AF: 0.00304 AC: 341 AN: 112297 Hom.: 2 Cov.: 23 AF XY: 0.00287 AC XY: 99 AN XY: 34469

African (AFR) AF: 0.0105 AC: 324 AN: 30922

American (AMR) AF: 0.00103 AC: 11 AN: 10634

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 2649

East Asian (EAS) AF: 0.00 AC: 0 AN: 3572

South Asian (SAS) AF: 0.00 AC: 0 AN: 2714

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 6140

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 219

European-Non Finnish (NFE) AF: 0.0000188 AC: 1 AN: 53227

Other (OTH) AF: 0.00326 AC: 5 AN: 1532

Alfa AF: 0.00221 Hom.: 5

Bravo AF: 0.00360

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Congenital muscular hypertrophy-cerebral syndrome Benign:1

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.84
CADD	Benign	4.9
DANN	Benign	0.55
PhyloP100		0.95
Mutation Taster		=100/0	polymorphism

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

Other links and lift over

dbSNP: rs142173620; hg19: chrX-53402137;