rs121908107

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 0P and 6B. BP4BP6BS2

The NM_033118.4(MYLK2):c.260C>T(p.Ala87Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000162 in 1,612,982 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 Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A87T) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00016 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00016 ( 0 hom. )

Consequence

MYLK2
NM_033118.4 missense

Scores

Clinical Significance

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

Conservation

PhyloP100: 1.26

Publications

10 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: Likely_benign. The variant received -6 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.38412976).

BP6

Variant 20-31820333-C-T is Benign according to our data. Variant chr20-31820333-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 4243.

BS2

High AC in GnomAd4 at 25 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYLK2	NM_033118.4 link	c.260C>T	p.Ala87Val	missense_variant	Exon 3 of 13	ENST00000375985.5	NP_149109.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MYLK2	ENST00000375985.5 link	c.260C>T	p.Ala87Val	missense_variant	Exon 3 of 13	1	NM_033118.4	ENSP00000365152.4
MYLK2	ENST00000375994.6 link	c.260C>T	p.Ala87Val	missense_variant	Exon 2 of 12	1		ENSP00000365162.2

Frequencies

GnomAD3 genomes

AF:

0.000164

AC:

AN:

152228

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000169

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000523

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.0127

Gnomad NFE

AF:

0.0000882

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000158

AC:

AN:

246866

AF XY:

0.000171

show subpopulations

Gnomad AFR exome

AF:

0.0000648

Gnomad AMR exome

AF:

0.000435

Gnomad ASJ exome

AF:

0.000101

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000145

Gnomad OTH exome

AF:

0.000497

GnomAD4 exome

AF:

0.000162

AC:

237

AN:

1460636

Hom.:

Cov.:

AF XY:

0.000169

AC XY:

123

AN XY:

726618

show subpopulations

African (AFR)

AF:

0.00105

AC:

AN:

33478

American (AMR)

AF:

0.000514

AC:

AN:

44714

Ashkenazi Jewish (ASJ)

AF:

0.0000383

AC:

AN:

26132

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.0000928

AC:

AN:

86250

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52408

Middle Eastern (MID)

AF:

0.00225

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

0.000120

AC:

133

AN:

1111834

Other (OTH)

AF:

0.000398

AC:

AN:

60356

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.489

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:

0.000164

AC:

AN:

152346

Hom.:

Cov.:

AF XY:

0.000134

AC XY:

AN XY:

74490

show subpopulations

African (AFR)

AF:

0.000168

AC:

AN:

41590

American (AMR)

AF:

0.000523

AC:

AN:

15308

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5180

South Asian (SAS)

AF:

0.00

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10624

Middle Eastern (MID)

AF:

0.0136

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000882

AC:

AN:

68022

Other (OTH)

AF:

0.00

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.487

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:

0.000156

Hom.:

Bravo

AF:

0.000215

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000117

AC:

ExAC

AF:

0.000132

AC:

EpiCase

AF:

0.000218

EpiControl

AF:

0.000237

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1Uncertain:2Benign:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Hypertrophic cardiomyopathy 1

Uncertain:2

Oct 30, 2020

Breda Genetics srl

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Based on allele frequency, in-silico prediction scores and a certain overlap with the clinical phenotype, we interpreted this variant at least as of uncertain significance. The lack of one or more of the following features has discouraged further investigations: lack of a possible second hit in autosomal recessive conditions, presence of healthy controls in databases for autosomal dominant conditions, presence of unmatching cardinal clinical features in the patient or in the known gene-disease association, lack of segregation in the family, and/or variant type outside the known gene mutational spectrum. -

Jan 23, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 87 of the MYLK2 protein (p.Ala87Val). This variant is present in population databases (rs121908107, gnomAD 0.05%). This missense change has been observed in individual(s) with hypertrophic cardiomyopathy (PMID: 11733062). ClinVar contains an entry for this variant (Variation ID: 4243). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt MYLK2 protein function with a negative predictive value of 80%. 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. -

Cardiomyopathy, hypertrophic, midventricular, digenic

Pathogenic:1

Nov 30, 2001

OMIM

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

not specified

Benign:1

Feb 18, 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.260C>T (p.Ala87Val) results in a non-conservative amino acid change in the encoded protein sequence. Three of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.00016 in 246866 control chromosomes, predominantly at a frequency of 0.00044 within the Latino subpopulation in the gnomAD database. The observed variant frequency within Latino control individuals in the gnomAD database is approximately 17 fold of the estimated maximal expected allele frequency for a pathogenic variant in MYLK2 causing Hypertrophic Cardiomyopathy phenotype (2.5e-05).c.260C>T has been reported in the literature in two individuals from the same family, who were affected with Hypertrophic Cardiomyopathy (Davies_2001), and in a later study in an individual with sudden unexplained death (Martinez-Matilla_2019). However, these reports do not provide unequivocal conclusions about association of the variant with Hypertrophic Cardiomyopathy. One of these publications reported experimental evidence evaluating an impact on protein function, and demonstrated increased V(max), however the variant protein tested in this study also carried another missense variant(s) in cis, therefore no conclusion can be made for the variant effect in isolation (Davies_2001). The following publications have been ascertained in the context of this evaluation (PMID: 11733062, 34426522, 31376648). ClinVar contains an entry for this variant (Variation ID: 4243). Based on the evidence outlined above, the variant was classified as likely benign. -

not provided

Benign:1

Sep 18, 2020

GeneDx

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant is associated with the following publications: (PMID: 28082330, 30609406, 28518168, 26187847, 22995991, 11733062, 23299917) -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.082

BayesDel_addAF

Benign

-0.13

BayesDel_noAF

Benign

-0.090

CADD

Benign

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.26

T;T

Eigen

Benign

-0.79

Eigen_PC

Benign

-0.83

FATHMM_MKL

Benign

0.078

LIST_S2

Benign

0.58

.;T

M_CAP

Uncertain

0.19

MetaRNN

Benign

0.38

T;T

MetaSVM

Benign

-0.88

MutationAssessor

Uncertain

2.3

M;M

PhyloP100

1.3

PrimateAI

Benign

0.43

PROVEAN

Benign

-1.0

N;N

REVEL

Uncertain

0.32

Sift

Pathogenic

0.0

D;D

Sift4G

Benign

0.16

T;T

Polyphen

0.55

P;P

Vest4

0.32

MVP

0.63

MPC

0.095

ClinPred

0.043

GERP RS

2.6

Varity_R

0.076

gMVP

0.056

Mutation Taster

=90/10

polymorphism

(source)

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

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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