10-110567718-C-A

Position:

• chr10-110567718-C-A

Variant summary

Our verdict is Benign. Variant got -18 ACMG points: 0P and 18B. BP4_Moderate BP6_Very_Strong BS1 BS2

The NM_005445.4(SMC3):​c.-99C>A variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0171 in 1,451,596 control chromosomes in the GnomAD database, including 278 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.014 (21 hom., cov: 34)
  • Exomes 𝑓: 0.017 (257 hom.)
• Consequence: SMC3 NM_005445.4 5_prime_UTR
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:3
• Conservation: PhyloP100: 0.201

Genes affected

SMC3 (HGNC:2468): (structural maintenance of chromosomes 3) This gene belongs to the SMC3 subfamily of SMC proteins. The encoded protein occurs in certain cell types as either an intracellular, nuclear protein or a secreted protein. The nuclear form, known as structural maintenance of chromosomes 3, is a component of the multimeric cohesin complex that holds together sister chromatids during mitosis, enabling proper chromosome segregation. Post-translational modification of the encoded protein by the addition of chondroitin sulfate chains gives rise to the secreted proteoglycan bamacan, an abundant basement membrane protein. [provided by RefSeq, Jul 2008]

SMC3 (HGNC:):

ACMG classification

Verdict is Benign. Variant got -18 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.41).
• BP6: Variant 10-110567718-C-A is Benign according to our data. Variant chr10-110567718-C-A is described in ClinVar as [Likely_benign]. Clinvar id is 298759.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.014 (2133/152338) while in subpopulation AMR AF= 0.041 (628/15304). AF 95% confidence interval is 0.0384. There are 21 homozygotes in gnomad4. There are 1067 alleles in male gnomad4 subpopulation. Median coverage is 34. This position pass quality control queck.
• BS2: High AC in GnomAd4 at 2133 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SMC3	NM_005445.4	c.-99C>A		5_prime_UTR_variant	1/29	ENST00000361804.5	NP_005436.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SMC3	ENST00000361804	c.-99C>A		5_prime_UTR_variant	1/29	1	NM_005445.4	ENSP00000354720.5
SMC3	ENST00000684988.1	n.35C>A		non_coding_transcript_exon_variant	1/25
SMC3	ENST00000691297.1	n.35C>A		non_coding_transcript_exon_variant	1/17
SMC3	ENST00000691527.1	n.-9C>A		upstream_gene_variant

Frequencies

GnomAD3 genomes AF: 0.0140 AC: 2127 AN: 152220 Hom.: 21 Cov.: 34

Gnomad AFR AF: 0.00328

Gnomad AMI AF: 0.0461

Gnomad AMR AF: 0.0408

Gnomad ASJ AF: 0.0124

Gnomad EAS AF: 0.00116

Gnomad SAS AF: 0.0192

Gnomad FIN AF: 0.00292

Gnomad MID AF: 0.0190

Gnomad NFE AF: 0.0164

Gnomad OTH AF: 0.0163

GnomAD4 exome AF: 0.0174 AC: 22670 AN: 1299258 Hom.: 257 Cov.: 18 AF XY: 0.0176 AC XY: 11473 AN XY: 653032

Gnomad4 AFR exome AF: 0.00421

Gnomad4 AMR exome AF: 0.0441

Gnomad4 ASJ exome AF: 0.0171

Gnomad4 EAS exome AF: 0.000129

Gnomad4 SAS exome AF: 0.0220

Gnomad4 FIN exome AF: 0.00558

Gnomad4 NFE exome AF: 0.0176

Gnomad4 OTH exome AF: 0.0170

GnomAD4 genome AF: 0.0140 AC: 2133 AN: 152338 Hom.: 21 Cov.: 34 AF XY: 0.0143 AC XY: 1067 AN XY: 74488

Gnomad4 AFR AF: 0.00327

Gnomad4 AMR AF: 0.0410

Gnomad4 ASJ AF: 0.0124

Gnomad4 EAS AF: 0.00116

Gnomad4 SAS AF: 0.0192

Gnomad4 FIN AF: 0.00292

Gnomad4 NFE AF: 0.0164

Gnomad4 OTH AF: 0.0166

Alfa AF: 0.00368 Hom.: 0

Bravo AF: 0.0161

Asia WGS AF: 0.0130 AC: 44 AN: 3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:2

Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Dec 09, 2018	- -
Likely benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

Cornelia de Lange syndrome 3 Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

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	-0.41
CADD	Benign	12
DANN	Benign	0.82
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

LitVar

Other links and lift over

dbSNP: rs148267784; hg19: chr10-112327476;