rs727503775

Variant names:

• chr10-110601015-GTTACAGGAACT-G
• rs727503775
• NM_005445.4:c.2536-5_2541delTACAGGAACTT

Variant summary

Our verdict is Likely pathogenic. The variant received 9 ACMG points: 9P and 0B. PVS1 PP5

The NM_005445.4(SMC3):​c.2536-5_2541delTACAGGAACTT​(p.Glu846_Asn848del) variant causes a splice acceptor, conservative inframe deletion, splice region, intron change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type DEL_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. Variant has been reported in ClinVar as Pathogenic (no stars).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SMC3 NM_005445.4 splice_acceptor, conservative_inframe_deletion, splice_region, intron
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 9.53
• Publications: 1 publications found

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 Gene-Disease associations (from GenCC):

• Cornelia de Lange syndrome

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen
• Cornelia de Lange syndrome 3

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Likely_pathogenic. The variant received 9 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, LoF is a know mechanism of disease, Cryptic splice site detected, with MaxEntScore 3.5, offset of 35, new splice context is: agggggtactgttctcacAGcca. Cryptic site results in frameshift change. If cryptic site found is not functional and variant results in exon loss, it results in frameshift change.
• PP5: Variant 10-110601015-GTTACAGGAACT-G is Pathogenic according to our data. Variant chr10-110601015-GTTACAGGAACT-G is described in ClinVar as Pathogenic. ClinVar VariationId is 180199.Status of the report is no_assertion_criteria_provided, 0 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005445.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SMC3	NM_005445.4	MANE Select	c.2536-5_2541delTACAGGAACTT	p.Glu846_Asn848del	splice_acceptor conservative_inframe_deletion splice_region intron	Exon 23 of 29	NP_005436.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SMC3	ENST00000361804.5	TSL:1 MANE Select	c.2536-5_2541delTACAGGAACTT	p.Glu846_Asn848del	splice_acceptor conservative_inframe_deletion splice_region intron	Exon 23 of 29	ENSP00000354720.5
	SMC3	ENST00000918257.1		c.2560-5_2565delTACAGGAACTT	p.Glu854_Asn856del	splice_acceptor conservative_inframe_deletion splice_region intron	Exon 23 of 29	ENSP00000588316.1
	SMC3	ENST00000966376.1		c.2554-5_2559delTACAGGAACTT	p.Glu852_Asn854del	splice_acceptor conservative_inframe_deletion splice_region intron	Exon 23 of 29	ENSP00000636435.1

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions as Germline

Significance: Pathogenic

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
1	-	-	Cornelia de Lange syndrome 3;C1854630:Wiedemann-Steiner syndrome (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		9.5
Mutation Taster		=3/197	disease causing (ClinVar)

Splicing

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

Other links and lift over

dbSNP: rs727503775; hg19: chr10-112360773;