12-49032935-G-C

Position:

• chr12-49032935-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_003482.4(KMT2D):​c.11770C>G​(p.Gln3924Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: KMT2D NM_003482.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.85

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 Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), KMT2D. . Gene score misZ 3.7288 (greater than the threshold 3.09). Trascript score misZ 4.6964 (greater than threshold 3.09). GenCC has associacion of gene with Kabuki syndrome, branchial arch abnormalities, choanal atresia, athelia, hearing loss, and hypothyroidism syndrome, Kabuki syndrome 1, choanal atresia-athelia-hypothyroidism-delayed puberty-short stature syndrome.
• BP4: Computational evidence support a benign effect (MetaRNN=0.19891432).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KMT2D	NM_003482.4	c.11770C>G	p.Gln3924Glu	missense_variant	40/55	ENST00000301067.12	NP_003473.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KMT2D	ENST00000301067.12	c.11770C>G	p.Gln3924Glu	missense_variant	40/55	5	NM_003482.4	ENSP00000301067	A2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 48

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Kabuki syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 09, 2022

This sequence change replaces glutamine, which is neutral and polar, with glutamic acid, which is acidic and polar, at codon 3924 of the KMT2D protein (p.Gln3924Glu). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt KMT2D protein function. ClinVar contains an entry for this variant (Variation ID: 1015388). This variant has not been reported in the literature in individuals affected with KMT2D-related conditions. This variant is not present in population databases (gnomAD no frequency). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Uncertain	0.042	T
BayesDel_noAF	Benign	-0.18
CADD	Benign	14
DANN	Benign	0.72
DEOGEN2	Benign	0.050	T
Eigen	Benign	-0.15
Eigen_PC	Benign	-0.12
FATHMM_MKL	Uncertain	0.85	D
LIST_S2	Benign	0.48	T
M_CAP	Pathogenic	0.43	D
MetaRNN	Benign	0.20	T
MetaSVM	Uncertain	-0.21	T
MutationAssessor	Benign	0.34	N
MutationTaster	Benign	0.80	N
PrimateAI	Benign	0.36	T
PROVEAN	Benign	-1.3	N
REVEL	Uncertain	0.31
Sift	Pathogenic	0.0	D
Polyphen		0.78	P
Vest4		0.31
MutPred		0.33		Gain of relative solvent accessibility (P = 0.1894);
MVP		0.50
MPC		0.16
ClinPred		0.27	T
GERP RS		3.6
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.31
gMVP		0.16

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: rs886041106; hg19: chr12-49426718;