rs727504408

Positions:

• chr12-110913096-C-G
• chr12-110913096-C-T

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM1 PM2 PM5 PP3

The NM_000432.4(MYL2):​c.402G>C​(p.Glu134Asp) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. E134A) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 33)
• Consequence: MYL2 NM_000432.4 missense, splice_region
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.53

Genes affected

MYL2 (HGNC:7583): (myosin light chain 2) This gene encodes a major sarcomeric protein in mammalian striated muscle. The encoded protein plays a role in embryonic heart muscle structure and function, while phosphorylation of the encoded protein is involved in cardiac myosin cycling kinetics, torsion and function in adults. Mutations in this gene are associated with hypertrophic cardiomyopathy 10 and infant-onset myopathy. [provided by RefSeq, May 2022]

MYL2 (HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 7 ACMG points.

• PM1: In a chain Myosin regulatory light chain 2, ventricular/cardiac muscle isoform (size 164) in uniprot entity MLRV_HUMAN there are 33 pathogenic changes around while only 3 benign (92%) in NM_000432.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr12-110913097-T-G is described in Lovd as [Pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.835

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MYL2	NM_000432.4	c.402G>C	p.Glu134Asp	missense_variant, splice_region_variant	6/7	ENST00000228841.15	NP_000423.2
MYL2	NM_001406745.1	c.360G>C	p.Glu120Asp	missense_variant, splice_region_variant	5/6		NP_001393674.1
MYL2	NM_001406916.1	c.345G>C	p.Glu115Asp	missense_variant, splice_region_variant	6/7		NP_001393845.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MYL2	ENST00000228841.15	c.402G>C	p.Glu134Asp	missense_variant, splice_region_variant	6/7	1	NM_000432.4	ENSP00000228841.8
MYL2	ENST00000548438.1	c.360G>C	p.Glu120Asp	missense_variant, splice_region_variant	5/6	3		ENSP00000447154.1
MYL2	ENST00000663220.1	c.345G>C	p.Glu115Asp	missense_variant, splice_region_variant	6/7			ENSP00000499568.1
MYL2	ENST00000549029.1	n.*37G>C		downstream_gene_variant		2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Feb 26, 2013

proposed classification - variant undergoing re-assessment, contact laboratory -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.66
CardioboostCm	Uncertain	0.72
BayesDel_addAF	Pathogenic	0.23	D
BayesDel_noAF	Uncertain	0.090
CADD	Pathogenic	34
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.74	D;.
Eigen	Uncertain	0.47
Eigen_PC	Uncertain	0.53
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Uncertain	0.96	D;D
M_CAP	Pathogenic	0.35	D
MetaRNN	Pathogenic	0.84	D;D
MetaSVM	Uncertain	0.0059	D
MutationAssessor	Uncertain	2.9	M;.
PrimateAI	Uncertain	0.58	T
PROVEAN	Uncertain	-2.8	D;D
REVEL	Pathogenic	0.68
Sift	Benign	0.056	T;D
Sift4G	Uncertain	0.059	T;T
Polyphen		0.48	P;.
Vest4		0.74
MutPred		0.61		Gain of catalytic residue at M138 (P = 0.0183);.;
MVP		0.86
MPC		0.68
ClinPred		0.99	D
GERP RS		5.1
Varity_R		0.75
gMVP		0.76

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	1.0
SpliceAI score (max)		0.73		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.73		Position offset: 0

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs727504408; hg19: chr12-111350900; COSMIC: COSV57408090; COSMIC: COSV57408090;