Genetic Variant MYL3:p.Ala57Asp (chr3-46860813-G-T) – ACMG Classification: Uncertain_significance (3 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 7P and 4B. PM1PM5PP2PP3_ModerateBS2

The NM_000258.3(MYL3):c.170C>A(p.Ala57Asp) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000118 in 1,614,056 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A57G) has been classified as Likely pathogenic.

Frequency

Genomes: 𝑓 0.00013 ( 1 hom., cov: 32)

Exomes 𝑓: 0.00012 ( 0 hom. )

Consequence

MYL3
NM_000258.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2U:19B:1

Conservation

PhyloP100: 8.15

Publications

53 publications found

Variant links:

Genes affected

MYL3 (HGNC:7584): (myosin light chain 3) MYL3 encodes myosin light chain 3, an alkali light chain also referred to in the literature as both the ventricular isoform and the slow skeletal muscle isoform. Mutations in MYL3 have been identified as a cause of mid-left ventricular chamber type hypertrophic cardiomyopathy. [provided by RefSeq, Jul 2008]

MYL3 Gene-Disease associations (from GenCC):

hypertrophic cardiomyopathy
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
hypertrophic cardiomyopathy 8
Inheritance: AD, SD Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics
arrhythmogenic right ventricular cardiomyopathy
Inheritance: AD Classification: LIMITED Submitted by: ClinGen
dilated cardiomyopathy
Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

MYL3 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

PM1

In a chain Myosin light chain 3 (size 193) in uniprot entity MYL3_HUMAN there are 15 pathogenic changes around while only 6 benign (71%) in NM_000258.3

PM5

Other missense variant is known to change same aminoacid residue: Variant chr3-46860813-G-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 31780.

PP2

Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 4 curated pathogenic missense variants (we use a threshold of 10). The gene has 1 curated benign missense variants. Gene score misZ: 0.75572 (below the threshold of 3.09). Trascript score misZ: 1.3243 (below the threshold of 3.09). GenCC associations: The gene is linked to hypertrophic cardiomyopathy, arrhythmogenic right ventricular cardiomyopathy, dilated cardiomyopathy, hypertrophic cardiomyopathy 8.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.86

BS2

High AC in GnomAd4 at 20 AD,SD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000258.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
MYL3	NM_000258.3	MANE Select	c.170C>A	p.Ala57Asp	missense	Exon 3 of 7	NP_000249.1	P08590
MYL3	NM_001406937.1		c.170C>A	p.Ala57Asp	missense	Exon 3 of 6	NP_001393866.1	P08590
MYL3	NM_001406938.1		c.170C>A	p.Ala57Asp	missense	Exon 5 of 9	NP_001393867.1	P08590

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
MYL3	ENST00000292327.6	TSL:1 MANE Select	c.170C>A	p.Ala57Asp	missense	Exon 3 of 7	ENSP00000292327.4	P08590
MYL3	ENST00000395869.5	TSL:1	c.170C>A	p.Ala57Asp	missense	Exon 3 of 6	ENSP00000379210.1	P08590
MYL3	ENST00000713934.1		c.302C>A	p.Ala101Asp	missense	Exon 3 of 7	ENSP00000519231.1	A0AAQ5BH63

Frequencies

GnomAD3 genomes

AF:

0.000132

AC:

AN:

152078

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000242

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000524

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000386

Gnomad SAS

AF:

0.000415

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000882

Gnomad OTH

AF:

0.000478

GnomAD2 exomes

AF:

0.000171

AC:

AN:

251470

AF XY:

0.000221

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.000397

Gnomad EAS exome

AF:

0.000489

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000967

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000116

AC:

170

AN:

1461860

Hom.:

Cov.:

AF XY:

0.000139

AC XY:

101

AN XY:

727228

show subpopulations

African (AFR)

AF:

0.0000299

AC:

AN:

33480

American (AMR)

AF:

0.0000224

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.000230

AC:

AN:

26136

East Asian (EAS)

AF:

0.000227

AC:

AN:

39700

South Asian (SAS)

AF:

0.000626

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.0000187

AC:

AN:

53388

Middle Eastern (MID)

AF:

0.00156

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.0000647

AC:

AN:

1112010

Other (OTH)

AF:

0.000281

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.477

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000131

AC:

AN:

152196

Hom.:

Cov.:

AF XY:

0.000108

AC XY:

AN XY:

74406

show subpopulations

African (AFR)

AF:

0.0000241

AC:

AN:

41522

American (AMR)

AF:

0.000523

AC:

AN:

15286

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3468

East Asian (EAS)

AF:

0.000387

AC:

AN:

5172

South Asian (SAS)

AF:

0.000415

AC:

AN:

4816

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10614

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000882

AC:

AN:

68000

Other (OTH)

AF:

0.000473

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.528

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000155

Hom.:

Bravo

AF:

0.000128

ExAC

AF:

0.000115

AC:

EpiCase

AF:

0.000327

EpiControl

AF:

0.000237

ClinVar

ClinVar submissions

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

Hypertrophic cardiomyopathy (5)

Hypertrophic cardiomyopathy 8 (5)

not provided (5)

Cardiomyopathy (3)

Cardiovascular phenotype (1)

Long QT syndrome (1)

MYL3-related disorder (1)

Primary familial hypertrophic cardiomyopathy (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.99

CardioboostCm

Uncertain

0.38

BayesDel_addAF

Uncertain

0.089

BayesDel_noAF

Pathogenic

0.24

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.83

Eigen

Pathogenic

1.1

Eigen_PC

Pathogenic

0.90

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Benign

0.78

M_CAP

Pathogenic

0.33

MetaRNN

Pathogenic

0.86

MetaSVM

Pathogenic

1.0

MutationAssessor

Pathogenic

4.7

PhyloP100

8.2

PrimateAI

Uncertain

0.74

PROVEAN

Pathogenic

-5.2

REVEL

Pathogenic

0.89

Sift

Pathogenic

0.0

Sift4G

Pathogenic

0.0010

Polyphen

1.0

Vest4

0.95

MutPred

0.61

Gain of disorder (P = 0.0453)

MVP

0.91

MPC

1.4

ClinPred

0.84

GERP RS

4.4

Varity_R

0.95

gMVP

0.92

Mutation Taster

=8/92

disease causing (ClinVar)

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

Details are displayed if max score is > 0.2

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over