NM_024757.5:c.2028dupG

Variant names:

• chr9-137777888-C-CG
• rs1554879411
• NM_024757.5:c.2028dupG

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_024757.5(EHMT1):​c.2028dupG​(p.Pro677AlafsTer21) variant causes a frameshift change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: EHMT1 NM_024757.5 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1 O:1
• Conservation: PhyloP100: 5.47
• Publications: 0 publications found

Genes affected

EHMT1 (HGNC:24650): (euchromatic histone lysine methyltransferase 1) The protein encoded by this gene is a histone methyltransferase that methylates the lysine-9 position of histone H3. This action marks the genomic region packaged with these methylated histones for transcriptional repression. This protein may be involved in the silencing of MYC- and E2F-responsive genes and therefore could play a role in the G0/G1 cell cycle transition. Defects in this gene are a cause of chromosome 9q subtelomeric deletion syndrome (9q-syndrome, also known as Kleefstra syndrome). Alternative splicing results in multiple transcript variants. [provided by RefSeq, Aug 2017]

EHMT1 Gene-Disease associations (from GenCC):

• Kleefstra syndrome

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• Kleefstra syndrome 1

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

ENSG00000293104 (HGNC:):

ACMG classification

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 9-137777888-C-CG is Pathogenic according to our data. Variant chr9-137777888-C-CG is described in ClinVar as Pathogenic. ClinVar VariationId is 65730.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_024757.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	EHMT1	NM_024757.5	MANE Select	c.2028dupG	p.Pro677AlafsTer21	frameshift	Exon 13 of 27	NP_079033.4
	EHMT1	NM_001354263.2		c.2007dupG	p.Pro670AlafsTer21	frameshift	Exon 13 of 27	NP_001341192.1
	EHMT1	NM_001354259.2		c.1935dupG	p.Pro646AlafsTer21	frameshift	Exon 12 of 16	NP_001341188.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	EHMT1	ENST00000460843.6	TSL:5 MANE Select	c.2028dupG	p.Pro677AlafsTer21	frameshift	Exon 13 of 27	ENSP00000417980.1	Q9H9B1-1
	EHMT1	ENST00000462484.5	TSL:1	c.2028dupG	p.Pro677AlafsTer21	frameshift	Exon 13 of 16	ENSP00000417328.1	Q9H9B1-4
	EHMT1	ENST00000896765.1		c.2100dupG	p.Pro701AlafsTer21	frameshift	Exon 14 of 28	ENSP00000566824.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	Kleefstra syndrome 1 (2)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		5.5
Mutation Taster		=0/200	disease causing (ClinVar)

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: rs1554879411; hg19: chr9-140672340;