rs531015124

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 0P and 8B. BP4_StrongBS2

The NM_033118.4(MYLK2):c.719T>C(p.Val240Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000112 in 1,612,076 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 (★★).

Frequency

Genomes: 𝑓 0.000086 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000034 ( 0 hom. )

Consequence

MYLK2
NM_033118.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: 0.0960

Variant links:

Genes affected

MYLK2 (HGNC:16243): (myosin light chain kinase 2) This gene encodes a myosin light chain kinase, a calcium/calmodulin dependent enzyme, that is exclusively expressed in adult skeletal muscle. [provided by RefSeq, Jul 2008]

MYLK2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -8 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.04361379).

BS2

High AC in GnomAd at 11 AD,Digenic gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYLK2	NM_033118.4 linkuse as main transcript	c.719T>C	p.Val240Ala	missense_variant	4/13	ENST00000375985.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYLK2	ENST00000375985.5 linkuse as main transcript	c.719T>C	p.Val240Ala	missense_variant	4/13	1	NM_033118.4	P1
MYLK2	ENST00000375994.6 linkuse as main transcript	c.719T>C	p.Val240Ala	missense_variant	3/12	1		P1

Frequencies

GnomAD3 genomes

AF:

0.0000726

AC:

AN:

151446

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000268

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000120

AC:

AN:

250860

Hom.:

AF XY:

0.00000737

AC XY:

AN XY:

135658

show subpopulations

Gnomad AFR exome

AF:

0.000123

Gnomad AMR exome

AF:

0.0000289

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:

0.00000342

AC:

AN:

1460514

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726356

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.0000671

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000858

AC:

AN:

151562

Hom.:

Cov.:

AF XY:

0.000108

AC XY:

AN XY:

74074

show subpopulations

Gnomad4 AFR

AF:

0.000316

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:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000987

Hom.:

Bravo

AF:

0.0000907

ExAC

AF:

0.0000165

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Jun 19, 2014	Variant classified as Uncertain Significance - Favor Benign. The Val240Ala varia nt in MYLK2 has not been previously identified in individuals with cardiomyopath y or in large population studies. Valine (Val) at position 240 is not conserved in mammals or evolutionarily distant species, and the change to Alanine (Ala) is present in pig and bat, supporting that a change at this position may be tolera ted. Additional computational prediction tools do not provide strong support for or against an impact to the protein. In summary, while the clinical significanc e of the Val240Ala variant is uncertain, these data suggest that it is more like ly to be benign. -
Uncertain significance, criteria provided, single submitter	clinical testing	Ambry Genetics	Jan 19, 2022	The p.V240A variant (also known as c.719T>C), located in coding exon 3 of the MYLK2 gene, results from a T to C substitution at nucleotide position 719. The valine at codon 240 is replaced by alanine, an amino acid with similar properties. This amino acid position is conserved. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Oct 20, 2021

Has not been previously published as pathogenic or benign to our knowledge; Not observed at a significant frequency in large population cohorts (Lek et al., 2016); In silico analysis supports that this missense variant does not alter protein structure/function; Reported in ClinVar as a variant of uncertain significance (ClinVar Variant ID# 164503; Landrum et al., 2016) -

Hypertrophic cardiomyopathy 1

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

May 12, 2021

This sequence change replaces valine with alanine at codon 240 of the MYLK2 protein (p.Val240Ala). The valine residue is moderately conserved and there is a small physicochemical difference between valine and alanine. 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 output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The alanine amino acid residue is found in multiple mammalian species, suggesting that this missense change does not adversely affect protein function. These predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with MYLK2-related conditions. ClinVar contains an entry for this variant (Variation ID: 164503). This variant is present in population databases (rs531015124, ExAC 0.02%). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.055

BayesDel_addAF

Benign

-0.36

BayesDel_noAF

Benign

-0.52

Cadd

Benign

Dann

Benign

0.60

DEOGEN2

Benign

0.18

T;T

Eigen

Benign

-0.63

Eigen_PC

Benign

-0.50

FATHMM_MKL

Benign

0.40

M_CAP

Benign

0.0092

MetaRNN

Benign

0.044

T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.5

L;L

MutationTaster

Benign

0.96

N;N

PrimateAI

Benign

0.36

PROVEAN

Benign

0.63

N;N

REVEL

Benign

0.068

Sift

Benign

0.21

T;T

Sift4G

Benign

0.81

T;T

Polyphen

0.0010

B;B

Vest4

0.058

MVP

0.51

MPC

0.10

ClinPred

0.038

GERP RS

-0.23

Varity_R

0.059

gMVP

0.29

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