NM_005445.4:c.859_861dupGAA

Variant names:

• chr10-110583432-A-AAAG
• rs797045997
• NM_005445.4:c.859_861dupGAA

Variant summary

Our verdict is Likely pathogenic. The variant received 7 ACMG points: 7P and 0B. PM1 PM2 PM4_Supporting PP5_Moderate

The NM_005445.4(SMC3):​c.859_861dupGAA​(p.Glu287dup) variant causes a conservative inframe insertion change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SMC3 NM_005445.4 conservative_inframe_insertion
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 6.94
• Publications: 3 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 7 ACMG points.

• PM1: In a coiled_coil_region (size 171) in uniprot entity SMC3_HUMAN there are 7 pathogenic changes around while only 2 benign (78%) in NM_005445.4
• PM2: Very rare variant in population databases, with high coverage
• PM4: Nonframeshift variant in NON repetitive region in NM_005445.4. Strenght limited to Supporting due to length of the change: 1aa.
• PP5: Variant 10-110583432-A-AAAG is Pathogenic according to our data. Variant chr10-110583432-A-AAAG is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 212273.Status of the report is criteria_provided_single_submitter, 1 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.859_861dupGAA	p.Glu287dup	conservative_inframe_insertion	Exon 11 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.859_861dupGAA	p.Glu287dup	conservative_inframe_insertion	Exon 11 of 29	ENSP00000354720.5
	SMC3	ENST00000684988.1		n.992_994dupGAA		non_coding_transcript_exon	Exon 11 of 25
	SMC3	ENST00000687823.1		n.773_775dupGAA		non_coding_transcript_exon	Exon 9 of 15

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions as Germline

Significance: Likely pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	Cornelia de Lange syndrome 3 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		6.9
Mutation Taster		=27/73	disease causing (ClinVar)

Splicing

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

Other links and lift over

dbSNP: rs797045997; hg19: chr10-112343190;