NM_000432.4:c.308T>G

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 4P and 9B. PM1PP3_ModerateBP6BS1BS2

The NM_000432.4(MYL2):c.308T>G(p.Phe103Cys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000353 in 1,614,070 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a pathogenic outcome for this variant. 13/22 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000038 ( 1 hom. )

Consequence

MYL2
NM_000432.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:5B:3

Conservation

PhyloP100: 8.95

Variant links:

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. 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

PP3

MetaRNN computational evidence supports a deleterious effect, 0.855

BP6

Variant 12-110913291-A-C is Benign according to our data. Variant chr12-110913291-A-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 181433.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=3, Uncertain_significance=5}.

BS1

Variant frequency is greater than expected in population sas. gnomad4_exome allele frequency = 0.0000376 (55/1461886) while in subpopulation SAS AF= 0.000614 (53/86258). AF 95% confidence interval is 0.000482. There are 1 homozygotes in gnomad4_exome. There are 42 alleles in male gnomad4_exome subpopulation. Median coverage is 35. This position pass quality control queck.

BS2

High AC in GnomAdExome4 at 55 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYL2	NM_000432.4 link	c.308T>G	p.Phe103Cys	missense_variant	Exon 5 of 7	ENST00000228841.15	NP_000423.2	P10916Q6IB42
MYL2	NM_001406745.1 link	c.266T>G	p.Phe89Cys	missense_variant	Exon 4 of 6		NP_001393674.1
MYL2	NM_001406916.1 link	c.251T>G	p.Phe84Cys	missense_variant	Exon 5 of 7		NP_001393845.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
MYL2	ENST00000228841.15 link	c.308T>G	p.Phe103Cys	missense_variant	Exon 5 of 7	1	NM_000432.4	ENSP00000228841.8	P10916
MYL2	ENST00000548438.1 link	c.266T>G	p.Phe89Cys	missense_variant	Exon 4 of 6	3		ENSP00000447154.1	G3V1V8
MYL2	ENST00000663220.1 link	c.251T>G	p.Phe84Cys	missense_variant	Exon 5 of 7			ENSP00000499568.1	A0A590UJU8
MYL2	ENST00000549029.1 link	n.139T>G		non_coding_transcript_exon_variant	Exon 2 of 2	2

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152184

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000414

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000119

AC:

AN:

251494

Hom.:

AF XY:

0.000162

AC XY:

AN XY:

135922

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000980

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000376

AC:

AN:

1461886

Hom.:

Cov.:

AF XY:

0.0000578

AC XY:

AN XY:

727240

show subpopulations

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:

0.000614

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152184

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74336

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000414

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

ExAC

AF:

0.000123

AC:

Asia WGS

AF:

0.000866

AC:

AN:

3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:5Benign:3

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Jun 24, 2013

Biesecker Lab/Clinical Genomics Section, National Institutes of Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: research

- -

Nov 04, 2020

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge; Reported in ClinVar (ClinVar Variant ID# 181433; Landrum et al., 2016) -

Cardiomyopathy

Uncertain:1Benign:1

Sep 27, 2023

Color Diagnostics, LLC DBA Color Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This missense variant replaces phenylalanine with cysteine at codon 103 of the MYL2 protein. Computational prediction suggests that this variant may have deleterious impact on protein structure and function (internally defined REVEL score threshold >= 0.7, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported in one individual affected with hypertrophic cardiomyopathy (PMID: 33029862). This variant occurs at an elevated allele frequency in the general population and has been identified in 30/251494 chromosomes (30/30616 South Asian chromosomes) by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

Nov 04, 2019

CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Hypertrophic cardiomyopathy

Uncertain:1

Dec 13, 2023

All of Us Research Program, National Institutes of Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Cardiovascular phenotype

Uncertain:1

Dec 14, 2018

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.F103C variant (also known as c.308T>G), located in coding exon 5 of the MYL2 gene, results from a T to G substitution at nucleotide position 308. The phenylalanine at codon 103 is replaced by cysteine, an amino acid with highly dissimilar properties. This alteration has been reported as a secondary cardiac variant in an exome cohort (Ng D et al. Circ Cardiovasc Genet, 2013 Aug;6:337-46). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

not specified

Benign:1

Oct 14, 2019

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.Phe86Ser variant in MYL2 is classified as likely benign because it has been identified in 0.098% (30/30616) of South Asian chromosomes by gnomAD (http://gnomad.broadinstitute.org). ACMG/AMP Criteria applied: BS1. -

Hypertrophic cardiomyopathy 10

Benign:1

Nov 04, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.97

CardioboostCm

Pathogenic

1.0

BayesDel_addAF

Pathogenic

0.21

BayesDel_noAF

Pathogenic

0.46

CADD

Pathogenic

DANN

Uncertain

0.99

DEOGEN2

Pathogenic

0.90

D;.

Eigen

Pathogenic

0.97

Eigen_PC

Pathogenic

0.83

FATHMM_MKL

Uncertain

0.97

LIST_S2

Pathogenic

0.98

D;D

M_CAP

Pathogenic

0.59

MetaRNN

Pathogenic

0.86

D;D

MetaSVM

Pathogenic

1.0

MutationAssessor

Pathogenic

4.3

H;.

PrimateAI

Pathogenic

0.85

PROVEAN

Pathogenic

-7.6

D;D

REVEL

Pathogenic

0.92

Sift

Pathogenic

0.0

D;D

Sift4G

Pathogenic

0.0

D;D

Polyphen

1.0

D;.

Vest4

0.92

MutPred

0.73

Loss of stability (P = 0.0049);.;

MVP

0.98

MPC

1.5

ClinPred

0.99

GERP RS

5.1

Varity_R

0.93

gMVP

0.97

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over