chr9-137813007-CTCTT-C

Variant names:

• chr9-137813007-CTCTT-C
• rs786205129
• NM_024757.5:c.2877_2880delTTCT

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_024757.5(EHMT1):​c.2877_2880delTTCT​(p.Ser960GlyfsTer7) variant causes a frameshift change involving the alteration of a conserved nucleotide. 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: 33)
• Consequence: EHMT1 NM_024757.5 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:6 O:1
• Conservation: PhyloP100: 7.90

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]

ACMG classification

Verdict is Pathogenic. Variant got 18 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 9-137813007-CTCTT-C is Pathogenic according to our data. Variant chr9-137813007-CTCTT-C is described in ClinVar as [Pathogenic]. Clinvar id is 65734.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr9-137813007-CTCTT-C is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
EHMT1	NM_024757.5	c.2877_2880delTTCT	p.Ser960GlyfsTer7	frameshift_variant	Exon 20 of 27	ENST00000460843.6	NP_079033.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
EHMT1	ENST00000460843.6	c.2877_2880delTTCT	p.Ser960GlyfsTer7	frameshift_variant	Exon 20 of 27	5	NM_024757.5	ENSP00000417980.1

Frequencies

GnomAD3 genomes Cov.: 33

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

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:6 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Kleefstra syndrome 1 Pathogenic:5 Other:1

Oct 11, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Ser960Glyfs*7) in the EHMT1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in EHMT1 are known to be pathogenic (PMID: 16826528, 19264732). This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individual(s) with Kleefstra syndrome (PMID: 22670141). In at least one individual the variant was observed to be de novo. ClinVar contains an entry for this variant (Variation ID: 65734). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. For these reasons, this variant has been classified as Pathogenic. -

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Laboratory of Genetics, Children's Clinical University Hospital Latvia

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: curation

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GeneReviews

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

- -

Apr 18, 2022

Laboratorio de Genetica e Diagnostico Molecular, Hospital Israelita Albert Einstein

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

ACMG classification criteria: PVS1 very strong, PS4 supporting, PM2 moderated, PM6 moderated -

Sep 01, 2022

3billion

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The variant is not observed in the gnomAD v2.1.1 dataset. It is predicted to result in a loss or disruption of normal protein function through nonsense-mediated decay (NMD) or protein truncation. Multiple pathogenic variants are reported downstream of the variant. The variant has been reported at least twice as pathogenic (ClinVar ID: VCV000065734/ PMID: 22670141). Therefore, this variant is classified as Pathogenic according to the recommendation of ACMG/AMP guideline. -

Mar 21, 2023

Center of Genomic medicine, Geneva, University Hospital of Geneva

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided Pathogenic:1

Jun 25, 2023

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Frameshift variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss of function is a known mechanism of disease; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 29276005, 22670141, 20945554, 31785789) -

Computational scores

Source: dbNSFP v4.3

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: rs786205129; hg19: chr9-140707459;