12-49051742-TG-T

Variant names:

• chr12-49051742-TG-T
• rs770315135
• NM_003482.4:c.1940delC

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 16P and 4B. PVS1 PP5_Very_Strong BS2

The NM_003482.4(KMT2D):​c.1940delC​(p.Pro647HisfsTer283) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000107 in 1,024,634 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 28)
  • Exomes 𝑓: 0.000011 (0 hom.)
• Consequence: KMT2D NM_003482.4 frameshift
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:4
• Conservation: PhyloP100: 1.50

Genes affected

KMT2D (HGNC:7133): (lysine methyltransferase 2D) The protein encoded by this gene is a histone methyltransferase that methylates the Lys-4 position of histone H3. The encoded protein is part of a large protein complex called ASCOM, which has been shown to be a transcriptional regulator of the beta-globin and estrogen receptor genes. Mutations in this gene have been shown to be a cause of Kabuki syndrome. [provided by RefSeq, Oct 2010]

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PP5: Variant 12-49051742-TG-T is Pathogenic according to our data. Variant chr12-49051742-TG-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 547404.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS2: High AC in GnomAdExome4 at 11 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KMT2D	NM_003482.4	c.1940delC	p.Pro647HisfsTer283	frameshift_variant	Exon 11 of 55	ENST00000301067.12	NP_003473.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KMT2D	ENST00000301067.12	c.1940delC	p.Pro647HisfsTer283	frameshift_variant	Exon 11 of 55	5	NM_003482.4	ENSP00000301067.7
KMT2D	ENST00000683543.2	c.1940delC	p.Pro647HisfsTer283	frameshift_variant	Exon 11 of 56			ENSP00000506726.1
KMT2D	ENST00000685166.1	c.1940delC	p.Pro647HisfsTer283	frameshift_variant	Exon 10 of 54			ENSP00000509386.1
KMT2D	ENST00000692637.1	c.1940delC	p.Pro647HisfsTer283	frameshift_variant	Exon 10 of 54			ENSP00000509666.1

Frequencies

GnomAD3 genomes Cov.: 28

GnomAD4 exome AF: 0.0000107 AC: 11 AN: 1024634 Hom.: 0 Cov.: 35 AF XY: 0.0000117 AC XY: 6 AN XY: 514508

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.0000303

Gnomad4 NFE exome AF: 0.0000116

Gnomad4 OTH exome AF: 0.0000260

GnomAD4 genome Cov.: 28

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:2

Jul 31, 2017

Eurofins Ntd Llc (ga)

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Oct 03, 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 in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 36253360, 35904121) -

Kabuki syndrome 1 Pathogenic:1

Nov 01, 2016

Center for Human Genetics, Inc, Center for Human Genetics, Inc

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Lung cancer Pathogenic:1

-

Molekularpathologisches Zentrum, Universitaetsklinikum Heidelberg

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: research

- -

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs770315135; hg19: chr12-49445525;