rs1467265277

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 2P and 6B. PM1BP4_ModerateBS2

The NM_000432.4(MYL2):c.418G>A(p.Ala140Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000124 in 1,611,540 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. 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. A140D) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000060 ( 0 hom., cov: 31)

Exomes 𝑓: 0.0000075 ( 0 hom. )

Consequence

MYL2
NM_000432.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 0.367

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 -4 ACMG points.

PM1

In a domain EF-hand 3 (size 35) in uniprot entity MLRV_HUMAN there are 17 pathogenic changes around while only 1 benign (94%) in NM_000432.4

BP4

Computational evidence support a benign effect (MetaRNN=0.09333804).

BS2

High AC in GnomAd at 9 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
MYL2	NM_000432.4 linkuse as main transcript	c.418G>A	p.Ala140Thr	missense_variant	7/7	ENST00000228841.15
MYL2	NM_001406745.1 linkuse as main transcript	c.376G>A	p.Ala126Thr	missense_variant	6/6
MYL2	NM_001406916.1 linkuse as main transcript	c.361G>A	p.Ala121Thr	missense_variant	7/7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris
MYL2	ENST00000228841.15 linkuse as main transcript	c.418G>A	p.Ala140Thr	missense_variant	7/7	1	NM_000432.4	P1
MYL2	ENST00000548438.1 linkuse as main transcript	c.376G>A	p.Ala126Thr	missense_variant	6/6	3
MYL2	ENST00000663220.1 linkuse as main transcript	c.361G>A	p.Ala121Thr	missense_variant	7/7

Frequencies

GnomAD3 genomes

AF:

0.0000599

AC:

AN:

150360

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000196

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000402

AC:

AN:

248700

Hom.:

AF XY:

0.00000743

AC XY:

AN XY:

134616

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000753

AC:

AN:

1461180

Hom.:

Cov.:

AF XY:

0.00000825

AC XY:

AN XY:

726868

show subpopulations

Gnomad4 AFR exome

AF:

0.0000597

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000630

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000599

AC:

AN:

150360

Hom.:

Cov.:

AF XY:

0.0000683

AC XY:

AN XY:

73194

show subpopulations

Gnomad4 AFR

AF:

0.000196

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000614

Hom.:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Hypertrophic cardiomyopathy 10

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jan 30, 2024

This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 140 of the MYL2 protein (p.Ala140Thr). This variant is present in population databases (rs4683, gnomAD 0.02%). This missense change has been observed in individual(s) with left ventricular noncompaction (PMID: 33500567). ClinVar contains an entry for this variant (Variation ID: 532774). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Not Available"; PolyPhen-2: "Benign"; Align-GVGD: "Not Available". The threonine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. 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. -

Hypertrophic cardiomyopathy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

All of Us Research Program, National Institutes of Health

Oct 06, 2023

This missense variant replaces alanine with threonine at codon 140 of the MYL2 protein. Computational prediction suggests that this variant may not impact protein structure and function (internally defined REVEL score threshold <= 0.5, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has not been reported in individuals affected with MYL2-related disorders in the literature. This variant has been identified in 5/279902 chromosomes in the general population 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.086

CardioboostCm

Benign

0.0014

BayesDel_addAF

Benign

-0.27

BayesDel_noAF

Benign

-0.44

Cadd

Benign

Dann

Benign

0.92

DEOGEN2

Benign

0.38

T;.

Eigen

Benign

-0.85

Eigen_PC

Benign

-0.77

FATHMM_MKL

Benign

0.56

LIST_S2

Benign

0.82

T;T

M_CAP

Benign

0.029

MetaRNN

Benign

0.093

T;T

MetaSVM

Benign

-0.87

MutationAssessor

Benign

0.91

L;.

MutationTaster

Benign

0.90

N;N

PrimateAI

Benign

0.37

PROVEAN

Benign

-0.98

N;N

REVEL

Benign

0.091

Sift

Benign

0.47

T;T

Sift4G

Benign

0.57

T;T

Polyphen

0.0010

B;.

Vest4

0.055

MutPred

0.40

Gain of catalytic residue at A141 (P = 0.0011);.;

MVP

0.76

MPC

0.38

ClinPred

0.072

GERP RS

1.9

Varity_R

0.047

gMVP

0.39

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