12-49027278-G-T

Variant names:

• chr12-49027278-G-T
• rs1555186079
• NM_003482.4:c.14688C>A

Variant summary

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

The NM_003482.4(KMT2D):​c.14688C>A​(p.Tyr4896*) variant causes a stop gained change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: KMT2D NM_003482.4 stop_gained
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 4.49
• Publications: 0 publications found

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]

KMT2D Gene-Disease associations (from GenCC):

• choanal atresia-athelia-hypothyroidism-delayed puberty-short stature syndrome

  Inheritance: AD Classification: DEFINITIVE, MODERATE Submitted by: Illumina, G2P
• Kabuki syndrome 1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Laboratory for Molecular Medicine, ClinGen, Labcorp Genetics (formerly Invitae), Ambry Genetics
• branchial arch abnormalities, choanal atresia, athelia, hearing loss, and hypothyroidism syndrome

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• Kabuki syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

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 12-49027278-G-T is Pathogenic according to our data. Variant chr12-49027278-G-T is described in ClinVar as Pathogenic. ClinVar VariationId is 463010.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_003482.4. 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
	KMT2D	NM_003482.4	MANE Select	c.14688C>A	p.Tyr4896*	stop_gained	Exon 49 of 55	NP_003473.3

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KMT2D	ENST00000301067.12	TSL:5 MANE Select	c.14688C>A	p.Tyr4896*	stop_gained	Exon 49 of 55	ENSP00000301067.7
	KMT2D	ENST00000683543.2		c.14688C>A	p.Tyr4896*	stop_gained	Exon 49 of 56	ENSP00000506726.1
	KMT2D	ENST00000685166.1		c.14697C>A	p.Tyr4899*	stop_gained	Exon 48 of 54	ENSP00000509386.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1402530 Hom.: 0 Cov.: 35 AF XY: 0.00 AC XY: 0 AN XY: 692044

African (AFR) AF: 0.00 AC: 0 AN: 31646

American (AMR) AF: 0.00 AC: 0 AN: 36122

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 21714

East Asian (EAS) AF: 0.00 AC: 0 AN: 39384

South Asian (SAS) AF: 0.00 AC: 0 AN: 74944

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 50184

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5296

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1085388

Other (OTH) AF: 0.00 AC: 0 AN: 57852

GnomAD4 genome Cov.: 31

ClinVar

ClinVar submissions as Germline

Significance: Pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	Kabuki syndrome (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.57
CADD	Pathogenic	40
DANN	Uncertain	0.99
Eigen	Pathogenic	0.88
Eigen_PC	Pathogenic	0.67
FATHMM_MKL	Pathogenic	0.98	D
PhyloP100		4.5
Vest4		0.84
GERP RS		3.1
Mutation Taster		=0/200	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		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: rs1555186079; hg19: chr12-49421061;