rs202084078

Variant summary

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

The NM_033118.4(MYLK2):c.524C>A(p.Thr175Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000115 in 1,613,976 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/20 in silico tools predict 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. T175A) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00062 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000062 ( 0 hom. )

Consequence

MYLK2
NM_033118.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:1

Conservation

PhyloP100: 0.372

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=0.009094089).

BS2

High AC in GnomAd at 95 AD,Digenic gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYLK2	NM_033118.4 linkuse as main transcript	c.524C>A	p.Thr175Asn	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.524C>A	p.Thr175Asn	missense_variant	4/13	1	NM_033118.4	P1
MYLK2	ENST00000375994.6 linkuse as main transcript	c.524C>A	p.Thr175Asn	missense_variant	3/12	1		P1

Frequencies

GnomAD3 genomes

AF:

0.000624

AC:

AN:

152234

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000965

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00595

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:

0.000211

AC:

AN:

251132

Hom.:

AF XY:

0.000162

AC XY:

AN XY:

135824

show subpopulations

Gnomad AFR exome

AF:

0.0000616

Gnomad AMR exome

AF:

0.00148

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:

0.000163

GnomAD4 exome

AF:

0.0000616

AC:

AN:

1461624

Hom.:

Cov.:

AF XY:

0.0000550

AC XY:

AN XY:

727116

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00186

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:

0.000116

GnomAD4 genome

AF:

0.000624

AC:

AN:

152352

Hom.:

Cov.:

AF XY:

0.000980

AC XY:

AN XY:

74500

show subpopulations

Gnomad4 AFR

AF:

0.0000962

Gnomad4 AMR

AF:

0.00594

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:

0.0000270

Hom.:

Bravo

AF:

0.000552

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000494

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Jul 25, 2014

The Thr175Asn variant in MYLK2 has not been previously reported in individuals w ith cardiomyopathy, but was identified in 1/4404 African American chromosomes by the NHLBI Exome Sequencing Project (http://evs.gs.washington.edu)and in 1/120 C olombian chromosomes by the 1000 Genomes Project (dbSNP rs202084078). Computatio nal prediction tools and conservation analysis suggest this variant may not impa ct the protein, though this information is not predictive enough to rule out pat hogenicity. In summary, the clinical significance of the Thr175Asn variant is un certain. -

Cardiomyopathy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

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

Jan 04, 2016

- -

Hypertrophic cardiomyopathy 1

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Oct 04, 2023

This sequence change replaces threonine, which is neutral and polar, with asparagine, which is neutral and polar, at codon 175 of the MYLK2 protein (p.Thr175Asn). This variant is present in population databases (rs202084078, gnomAD 0.2%), 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: 164501). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt MYLK2 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. -

not provided

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Dec 12, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.066

BayesDel_addAF

Benign

-0.51

BayesDel_noAF

Benign

-0.53

Cadd

Benign

Dann

Benign

0.93

DEOGEN2

Benign

0.22

T;T

Eigen

Benign

-0.40

Eigen_PC

Benign

-0.30

FATHMM_MKL

Benign

0.48

M_CAP

Benign

0.018

MetaRNN

Benign

0.0091

T;T

MetaSVM

Benign

-1.1

MutationAssessor

Benign

0.69

N;N

MutationTaster

Benign

1.0

N;N

PrimateAI

Benign

0.33

PROVEAN

Benign

-1.0

N;N

REVEL

Benign

0.082

Sift

Uncertain

0.0050

D;D

Sift4G

Benign

0.48

T;T

Polyphen

0.48

P;P

Vest4

0.054

MVP

0.69

MPC

0.20

ClinPred

0.092

GERP RS

2.0

Varity_R

0.12

gMVP

0.12

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