chr20-31823538-T-A

Variant names:

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_StrongBP6BS2

The NM_033118.4(MYLK2):c.834T>A(p.Asn278Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000573 in 1,613,908 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00043 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00059 ( 2 hom. )

Consequence

MYLK2
NM_033118.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:4B:5

Conservation

PhyloP100: -2.77

Publications

5 publications found

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 Gene-Disease associations (from GenCC):

hypertrophic cardiomyopathy 1
Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
hypertrophic cardiomyopathy
Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

MYLK2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.018444955).

BP6

Variant 20-31823538-T-A is Benign according to our data. Variant chr20-31823538-T-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 191740.

BS2

High AC in GnomAd4 at 66 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYLK2	NM_033118.4 link	c.834T>A	p.Asn278Lys	missense_variant	Exon 5 of 13	ENST00000375985.5	NP_149109.1	Q9H1R3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MYLK2	ENST00000375985.5 link	c.834T>A	p.Asn278Lys	missense_variant	Exon 5 of 13	1	NM_033118.4	ENSP00000365152.4		Q9H1R3
MYLK2	ENST00000375994.6 link	c.834T>A	p.Asn278Lys	missense_variant	Exon 4 of 12	1		ENSP00000365162.2		Q9H1R3

Frequencies

GnomAD3 genomes

AF:

0.000434

AC:

AN:

152202

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000145

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00105

Gnomad ASJ

AF:

0.000288

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000632

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000271

AC:

AN:

251186

AF XY:

0.000272

show subpopulations

Gnomad AFR exome

AF:

0.000123

Gnomad AMR exome

AF:

0.0000578

Gnomad ASJ exome

AF:

0.000298

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000537

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000588

AC:

859

AN:

1461588

Hom.:

Cov.:

AF XY:

0.000550

AC XY:

400

AN XY:

727090

show subpopulations

African (AFR)

AF:

0.0000299

AC:

AN:

33480

American (AMR)

AF:

0.000112

AC:

AN:

44720

Ashkenazi Jewish (ASJ)

AF:

0.000191

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53142

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.000750

AC:

834

AN:

1111994

Other (OTH)

AF:

0.000232

AC:

AN:

60390

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.481

Heterozygous variant carriers

137

183

229

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

102

136

170

<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:

0.000433

AC:

AN:

152320

Hom.:

Cov.:

AF XY:

0.000363

AC XY:

AN XY:

74474

show subpopulations

African (AFR)

AF:

0.000144

AC:

AN:

41576

American (AMR)

AF:

0.00105

AC:

AN:

15310

Ashkenazi Jewish (ASJ)

AF:

0.000288

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5176

South Asian (SAS)

AF:

0.00

AC:

AN:

4822

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10618

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000632

AC:

AN:

68026

Other (OTH)

AF:

0.00

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.504

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:

0.000568

Hom.:

Bravo

AF:

0.000446

TwinsUK

AF:

0.000809

AC:

ALSPAC

AF:

0.00

AC:

ESP6500AA

AF:

0.000454

AC:

ESP6500EA

AF:

0.000465

AC:

ExAC

AF:

0.000305

AC:

EpiCase

AF:

0.000327

EpiControl

AF:

0.000356

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:4Benign:5

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Uncertain:1Benign:1

Jun 27, 2025

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: MYLK2 c.834T>A (p.Asn278Lys) results in a non-conservative amino acid change in the encoded protein sequence. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change. The variant allele was found at a frequency of 0.00027 in 251186 control chromosomes, predominantly at a frequency of 0.00054 within the Non-Finnish European subpopulation in the gnomAD database. The observed variant frequency within Non-Finnish European control individuals in the gnomAD database is approximately 21 fold of the estimated maximal expected allele frequency for a pathogenic variant in MYLK2 causing Cardiomyopathy phenotype (2.5e-05). To our knowledge, no occurrence of c.834T>A in individuals affected with Cardiomyopathy and no experimental evidence demonstrating its impact on protein function have been reported. ClinVar contains an entry for this variant (Variation ID: 191740). Based on the evidence outlined above, the variant was classified as likely benign. -

May 26, 2015

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The p.Asn278Lys variant in MYLK2 has not been previously reported in individuals with cardiomyopathy, but has been identified in 34/66410 European chromosomes b y the Exome Aggregation Consortium (ExAC, http://exac.broadinstitute.org; dbSNP rs41293104). Computational prediction tools and conservation analysis do not pro vide strong support for or against an impact to the protein. In summary, the cli nical significance of the p.Asn278Lys variant is uncertain. -

not provided

Uncertain:1Benign:1

Jun 24, 2013

Biesecker Lab/Clinical Genomics Section, National Institutes of Health

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:research

- -

Feb 18, 2020

GeneDx

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Reported in ClinVar as a variant of uncertain significance (ClinVar Variant ID# 191740; Landrum et al., 2016); In silico analysis supports that this missense variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 23861362) -

Hypertrophic cardiomyopathy 1

Benign:2

Mar 01, 2019

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jan 08, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Cardiomyopathy

Uncertain:1

Aug 29, 2016

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

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Hypertrophic cardiomyopathy

Uncertain:1

Jul 26, 2017

Center for Advanced Laboratory Medicine, UC San Diego Health, University of California San Diego

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

MYLK2-related disorder

Benign:1

Feb 05, 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

Benign

0.19

BayesDel_addAF

Benign

-0.53

BayesDel_noAF

Benign

-0.62

CADD

Benign

0.022

(source)

DANN

Benign

0.28

DEOGEN2

Benign

0.21

T;T

Eigen

Benign

-1.3

Eigen_PC

Benign

-1.5

FATHMM_MKL

Benign

0.068

LIST_S2

Benign

0.72

.;T

M_CAP

Benign

0.045

MetaRNN

Benign

0.018

T;T

MetaSVM

Benign

-0.89

MutationAssessor

Uncertain

2.3

M;M

PhyloP100

-2.8

PrimateAI

Uncertain

0.62

PROVEAN

Benign

-0.72

N;N

REVEL

Benign

0.10

Sift

Benign

0.11

T;T

Sift4G

Benign

0.89

T;T

Polyphen

0.0020

B;B

Vest4

0.33

MutPred

0.25

Gain of ubiquitination at N278 (P = 0.0162);Gain of ubiquitination at N278 (P = 0.0162);

MVP

0.42

MPC

0.14

ClinPred

0.019

GERP RS

-4.8

Varity_R

0.12

gMVP

0.36

Mutation Taster

=95/5

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over