rs1555257773

Variant names:

• chr12-110913277-G-A
• rs1555257773
• NM_000432.4:c.322C>T

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM1 PM2 PP3

The NM_000432.4(MYL2):​c.322C>T​(p.Pro108Ser) variant causes a missense 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. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: MYL2 NM_000432.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.60

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 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
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.834

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYL2	NM_000432.4	c.322C>T	p.Pro108Ser	missense_variant	Exon 5 of 7	ENST00000228841.15	NP_000423.2
MYL2	NM_001406745.1	c.280C>T	p.Pro94Ser	missense_variant	Exon 4 of 6		NP_001393674.1
MYL2	NM_001406916.1	c.265C>T	p.Pro89Ser	missense_variant	Exon 5 of 7		NP_001393845.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MYL2	ENST00000228841.15	c.322C>T	p.Pro108Ser	missense_variant	Exon 5 of 7	1	NM_000432.4	ENSP00000228841.8
MYL2	ENST00000548438.1	c.280C>T	p.Pro94Ser	missense_variant	Exon 4 of 6	3		ENSP00000447154.1
MYL2	ENST00000663220.1	c.265C>T	p.Pro89Ser	missense_variant	Exon 5 of 7			ENSP00000499568.1
MYL2	ENST00000549029.1	n.153C>T		non_coding_transcript_exon_variant	Exon 2 of 2	2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 35

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hypertrophic cardiomyopathy 10 Uncertain:1

Jun 04, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. ClinVar contains an entry for this variant (Variation ID: 464144). This variant has not been reported in the literature in individuals affected with MYL2-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces proline, which is neutral and non-polar, with serine, which is neutral and polar, at codon 108 of the MYL2 protein (p.Pro108Ser). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.21
CardioboostCm	Uncertain	0.42
BayesDel_addAF	Pathogenic	0.22	D
BayesDel_noAF	Uncertain	0.080
CADD	Uncertain	26
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.76	D;.
Eigen	Benign	0.18
Eigen_PC	Uncertain	0.33
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Benign	0.84	T;T
M_CAP	Uncertain	0.16	D
MetaRNN	Pathogenic	0.83	D;D
MetaSVM	Benign	-0.41	T
MutationAssessor	Benign	1.8	L;.
PrimateAI	Uncertain	0.67	T
PROVEAN	Pathogenic	-5.2	D;D
REVEL	Uncertain	0.63
Sift	Uncertain	0.0060	D;D
Sift4G	Benign	0.083	T;D
Polyphen		0.040	B;.
Vest4		0.84
MutPred		0.36		Gain of catalytic residue at V113 (P = 0);.;
MVP		0.87
MPC		0.45
ClinPred		0.99	D
GERP RS		5.1
Varity_R		0.66
gMVP		0.74

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: rs1555257773; hg19: chr12-111351081;