11-118436570-G-A

Variant summary

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

The NM_001197104.2(KMT2A):c.58G>A(p.Gly20Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000133 in 150,854 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.000013 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: KMT2A NM_001197104.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.62

Genes affected

KMT2A (HGNC:7132): (lysine methyltransferase 2A) This gene encodes a transcriptional coactivator that plays an essential role in regulating gene expression during early development and hematopoiesis. The encoded protein contains multiple conserved functional domains. One of these domains, the SET domain, is responsible for its histone H3 lysine 4 (H3K4) methyltransferase activity which mediates chromatin modifications associated with epigenetic transcriptional activation. This protein is processed by the enzyme Taspase 1 into two fragments, MLL-C and MLL-N. These fragments reassociate and further assemble into different multiprotein complexes that regulate the transcription of specific target genes, including many of the HOX genes. Multiple chromosomal translocations involving this gene are the cause of certain acute lymphoid leukemias and acute myeloid leukemias. Alternate splicing results in multiple transcript variants.[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 where missense usually causes diseases, KMT2A
• BP4: Computational evidence support a benign effect (MetaRNN=0.22228071).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KMT2A	NM_001197104.2	c.58G>A	p.Gly20Ser	missense_variant	1/36	ENST00000534358.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KMT2A	ENST00000534358.8	c.58G>A	p.Gly20Ser	missense_variant	1/36	1	NM_001197104.2	P4

Frequencies

GnomAD3 genomes AF: 0.0000133 AC: 2 AN: 150854 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000485

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AC0;AS_VQSR AF: 0.00 AC: 0 AN: 1040230 Hom.: 0 Cov.: 19 AF XY: 0.00 AC XY: 0 AN XY: 491326

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: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.0000133 AC: 2 AN: 150854 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 73632

Gnomad4 AFR AF: 0.0000485

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

Bravo AF: 0.0000113

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jun 13, 2022

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 KMT2A protein function. This variant has not been reported in the literature in individuals affected with KMT2A-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces glycine, which is neutral and non-polar, with serine, which is neutral and polar, at codon 20 of the KMT2A protein (p.Gly20Ser). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.17
BayesDel_addAF	Uncertain	0.12	D
BayesDel_noAF	Uncertain	-0.070
Cadd	Uncertain	24
Dann	Benign	0.97
Eigen	Benign	-0.49
Eigen_PC	Benign	-0.40
FATHMM_MKL	Benign	0.55	D
LIST_S2	Benign	0.58	T;T;T;T
M_CAP	Pathogenic	0.90	D
MetaRNN	Benign	0.22	T;T;T;T
MetaSVM	Benign	-0.71	T
MutationAssessor	Benign	0.90	L;L;.;L
MutationTaster	Benign	0.99	N;N;N
PrimateAI	Pathogenic	0.94	D
PROVEAN	Benign	-0.91	N;N;N;.
REVEL	Benign	0.18
Sift	Pathogenic	0.0	D;D;D;.
Sift4G	Uncertain	0.032	D;T;D;.
Polyphen		0.038, 0.022	.;B;B;.
Vest4		0.29
MutPred		0.17		Gain of glycosylation at G20 (P = 0.0011);Gain of glycosylation at G20 (P = 0.0011);Gain of glycosylation at G20 (P = 0.0011);Gain of glycosylation at G20 (P = 0.0011);
MVP		0.59
MPC		0.79
ClinPred		0.53	D
GERP RS		1.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		3.0
Varity_R		0.33
gMVP		0.32

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: rs1305215954; hg19: chr11-118307285;