dbSNP rs772716379: MYLK2:p.Arg568Cys (chr20-31832128-C-T) – ACMG Classification: Likely_benign (-4 pts)

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 0P and 4B. BS2

The NM_033118.4(MYLK2):c.1702C>T(p.Arg568Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000054 in 1,574,080 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000040 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000056 ( 0 hom. )

Consequence

MYLK2
NM_033118.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3B:1

Conservation

PhyloP100: 1.56

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 Likely_benign. Variant got -4 ACMG points.

BS2

High AC in GnomAd4 at 6 AD,Digenic gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYLK2	NM_033118.4 link	c.1702C>T	p.Arg568Cys	missense_variant	Exon 12 of 13	ENST00000375985.5	NP_149109.1	Q9H1R3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
MYLK2	ENST00000375985.5 link	c.1702C>T	p.Arg568Cys	missense_variant	Exon 12 of 13	1	NM_033118.4	ENSP00000365152.4	Q9H1R3
MYLK2	ENST00000375994.6 link	c.1702C>T	p.Arg568Cys	missense_variant	Exon 11 of 12	1		ENSP00000365162.2	Q9H1R3
MYLK2	ENST00000468730.1 link	n.640C>T		non_coding_transcript_exon_variant	Exon 5 of 6	1

Frequencies

GnomAD3 genomes

AF:

0.0000396

AC:

AN:

151538

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000242

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

Gnomad ASJ

AF:

0.000290

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:

0.000957

GnomAD3 exomes

AF:

0.000145

AC:

AN:

242014

Hom.:

AF XY:

0.000145

AC XY:

AN XY:

130608

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000651

Gnomad ASJ exome

AF:

0.000916

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000498

Gnomad NFE exome

AF:

0.0000273

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000555

AC:

AN:

1422542

Hom.:

Cov.:

AF XY:

0.0000509

AC XY:

AN XY:

706590

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000532

Gnomad4 ASJ exome

AF:

0.000643

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000237

Gnomad4 FIN exome

AF:

0.0000211

Gnomad4 NFE exome

AF:

0.0000285

Gnomad4 OTH exome

AF:

0.000104

GnomAD4 genome

AF:

0.0000396

AC:

AN:

151538

Hom.:

Cov.:

AF XY:

0.0000405

AC XY:

AN XY:

74038

show subpopulations

Gnomad4 AFR

AF:

0.0000242

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.000290

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.000957

Alfa

AF:

0.000135

Hom.:

Bravo

AF:

0.0000416

ExAC

AF:

0.000115

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3Benign:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

See cases

Uncertain:1

Jan 27, 2020

Laboratorio de Genetica e Diagnostico Molecular, Hospital Israelita Albert Einstein

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

ACMG classification criteria: PM2 -

not provided

Uncertain:1

Oct 06, 2023

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Has not been previously published as pathogenic or benign to our knowledge; In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; In silico analysis supports a deleterious effect on splicing -

Hypertrophic cardiomyopathy 1

Uncertain:1

Apr 25, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 568 of the MYLK2 protein (p.Arg568Cys). This variant is present in population databases (rs772716379, gnomAD 0.09%), and has an allele count higher than expected for a pathogenic variant. This variant has not been reported in the literature in individuals affected with MYLK2-related conditions. ClinVar contains an entry for this variant (Variation ID: 406157). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. 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. -

MYLK2-related disorder

Benign:1

Jun 06, 2024

PreventionGenetics, part of Exact Sciences

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.72

BayesDel_addAF

Benign

-0.24

BayesDel_noAF

Benign

-0.23

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.78

D;D

Eigen

Uncertain

0.52

Eigen_PC

Uncertain

0.54

FATHMM_MKL

Uncertain

0.95

LIST_S2

Uncertain

0.93

.;D

M_CAP

Benign

0.044

MetaRNN

Benign

0.35

T;T

MetaSVM

Benign

-0.45

MutationAssessor

Benign

1.0

L;L

PrimateAI

Uncertain

0.78

PROVEAN

Uncertain

-3.7

D;D

REVEL

Uncertain

0.40

Sift

Pathogenic

0.0

D;D

Sift4G

Pathogenic

0.0010

D;D

Polyphen

1.0

D;D

Vest4

0.61

MVP

0.80

MPC

0.53

ClinPred

0.34

GERP RS

5.1

Varity_R

0.40

gMVP

0.75

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.67

Details are displayed if max score is > 0.2

DS_DG_spliceai

0.67

Position offset: -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