rs797045051

Positions:

• chr11-118495830-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 5P and 1B. PM2 PP2 PP5_Moderate BP4

The NM_001197104.2(KMT2A):​c.5494C>A​(p.Pro1832Thr) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: KMT2A NM_001197104.2 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 3.92

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]

KMT2A (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 4 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), KMT2A. . Gene score misZ 6.2276 (greater than the threshold 3.09). Trascript score misZ 8.7715 (greater than threshold 3.09). GenCC has associacion of gene with Wiedemann-Steiner syndrome.
• PP5: Variant 11-118495830-C-A is Pathogenic according to our data. Variant chr11-118495830-C-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 209168.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP4: Computational evidence support a benign effect (MetaRNN=0.3364471). . Strength limited to SUPPORTING due to the PP5.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KMT2A	NM_001197104.2	c.5494C>A	p.Pro1832Thr	missense_variant	19/36	ENST00000534358.8	NP_001184033.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KMT2A	ENST00000534358.8	c.5494C>A	p.Pro1832Thr	missense_variant	19/36	1	NM_001197104.2	ENSP00000436786.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Wiedemann-Steiner syndrome Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Baylor Genetics

Oct 11, 2013

Likely pathogenicity based on finding it once in our laboratory de novo in a 19-year-old female with hypertrophic cardiomyopathy, polyneuropathy, chorea, epilepsy, delayed puberty, PCOS, osteopenia, mild intellectual disability, hypertrichosis, Asperger syndrome, attention deficit, anxiety, strabismus, dysmorphisms -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.096
BayesDel_addAF	Uncertain	0.035	T
BayesDel_noAF	Benign	-0.19
CADD	Benign	20
DANN	Uncertain	0.99
DEOGEN2	Benign	0.26	.;T;.
Eigen	Uncertain	0.19
Eigen_PC	Uncertain	0.27
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.94	D;D;D
M_CAP	Uncertain	0.11	D
MetaRNN	Benign	0.34	T;T;T
MetaSVM	Uncertain	-0.087	T
MutationAssessor	Benign	1.9	.;M;.
PrimateAI	Uncertain	0.59	T
PROVEAN	Uncertain	-2.5	D;D;.
REVEL	Uncertain	0.37
Sift	Uncertain	0.014	D;D;.
Sift4G	Uncertain	0.013	D;D;.
Polyphen		0.55	.;P;.
Vest4		0.29
MutPred		0.22		.;Gain of phosphorylation at P1829 (P = 0.0051);.;
MVP		0.52
MPC		1.5
ClinPred		0.92	D
GERP RS		4.4
Varity_R		0.41
gMVP		0.56

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: rs797045051; hg19: chr11-118366545;