rs147770839

Variant names:

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_StrongBP6BS1

The NM_053025.4(MYLK):c.842A>G(p.Lys281Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000364 in 1,566,968 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 17/22 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 0.00020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000019 ( 0 hom. )

Consequence

MYLK
NM_053025.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:4B:1

Conservation

PhyloP100: 1.97

Publications

1 publications found

Variant links:

Genes affected

MYLK (HGNC:7590): (myosin light chain kinase) This gene, a muscle member of the immunoglobulin gene superfamily, encodes myosin light chain kinase which is a calcium/calmodulin dependent enzyme. This kinase phosphorylates myosin regulatory light chains to facilitate myosin interaction with actin filaments to produce contractile activity. This gene encodes both smooth muscle and nonmuscle isoforms. In addition, using a separate promoter in an intron in the 3' region, it encodes telokin, a small protein identical in sequence to the C-terminus of myosin light chain kinase, that is independently expressed in smooth muscle and functions to stabilize unphosphorylated myosin filaments. A pseudogene is located on the p arm of chromosome 3. Four transcript variants that produce four isoforms of the calcium/calmodulin dependent enzyme have been identified as well as two transcripts that produce two isoforms of telokin. Additional variants have been identified but lack full length transcripts. [provided by RefSeq, Jul 2008]

MYLK Gene-Disease associations (from GenCC):

aortic aneurysm, familial thoracic 7
Inheritance: AD Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
familial thoracic aortic aneurysm and aortic dissection
Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, ClinGen
megacystis-microcolon-intestinal hypoperistalsis syndrome 1
Inheritance: AR Classification: STRONG Submitted by: G2P
connective tissue disorder
Inheritance: AD Classification: MODERATE Submitted by: Genomics England PanelApp
megacystis-microcolon-intestinal hypoperistalsis syndrome
Inheritance: AD, AR Classification: SUPPORTIVE, LIMITED Submitted by: Orphanet, Ambry Genetics

MYLK 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=0.0216524).

BP6

Variant 3-123734154-T-C is Benign according to our data. Variant chr3-123734154-T-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 576135.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.000197 (30/152318) while in subpopulation AFR AF = 0.000722 (30/41580). AF 95% confidence interval is 0.000518. There are 0 homozygotes in GnomAd4. There are 15 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYLK	NM_053025.4 link	c.842A>G	p.Lys281Arg	missense_variant	Exon 10 of 34	ENST00000360304.8	NP_444253.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MYLK	ENST00000360304.8 link	c.842A>G	p.Lys281Arg	missense_variant	Exon 10 of 34	5	NM_053025.4	ENSP00000353452.3

Frequencies

GnomAD3 genomes

AF:

0.000191

AC:

AN:

152200

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000700

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

GnomAD2 exomes

AF:

0.0000623

AC:

AN:

208796

AF XY:

0.0000356

show subpopulations

Gnomad AFR exome

AF:

0.000768

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000198

GnomAD4 exome

AF:

0.0000191

AC:

AN:

1414650

Hom.:

Cov.:

AF XY:

0.0000186

AC XY:

AN XY:

700118

show subpopulations

African (AFR)

AF:

0.000718

AC:

AN:

32036

American (AMR)

AF:

0.0000258

AC:

AN:

38756

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

23438

East Asian (EAS)

AF:

0.00

AC:

AN:

39314

South Asian (SAS)

AF:

0.00

AC:

AN:

79222

European-Finnish (FIN)

AF:

0.00

AC:

AN:

43348

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5556

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1094554

Other (OTH)

AF:

0.0000513

AC:

AN:

58426

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.447

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:

0.000197

AC:

AN:

152318

Hom.:

Cov.:

AF XY:

0.000201

AC XY:

AN XY:

74492

show subpopulations

African (AFR)

AF:

0.000722

AC:

AN:

41580

American (AMR)

AF:

0.00

AC:

AN:

15302

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:

4824

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10630

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68010

Other (OTH)

AF:

0.00

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.527

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:

0.0000516

Hom.:

Bravo

AF:

0.000208

ESP6500AA

AF:

0.000908

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000906

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:4Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Jun 24, 2020

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, which includes protein predictors and evolutionary conservation, supports that this variant does not alter protein structure/function; Reported in ClinVar as a variant of uncertain significance (ClinVar Variant ID#576135; Landrum et al., 2016) -

Seattle Children's Hospital Molecular Genetics Laboratory, Seattle Children's Hospital

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.842A>G variant substitutes the lysine with arginine at position 281 of the protein. This variant has been observed in large population studies (18 total alleles, including 17 of 24,340 alleles in individuals of African ancestry; no homozygotes; gnomAD v2.1.1). This variant is present in the ClinVar database (Variation ID: 576135). In silico tools predict this change is tolerated. -

Aortic aneurysm, familial thoracic 7

Uncertain:1Benign:1

Sep 16, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Familial thoracic aortic aneurysm and aortic dissection

Uncertain:1

Sep 20, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.842A>G (p.K281R) alteration is located in exon 10 (coding exon 7) of the MYLK gene. This alteration results from a A to G substitution at nucleotide position 842, causing the lysine (K) at amino acid position 281 to be replaced by an arginine (R). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.15

BayesDel_addAF

Benign

-0.43

BayesDel_noAF

Benign

-0.47

CADD

Benign

(source)

DANN

Benign

0.97

DEOGEN2

Benign

0.17

.;.;.;T;.;T

Eigen

Benign

-0.74

Eigen_PC

Benign

-0.71

FATHMM_MKL

Benign

0.31

LIST_S2

Benign

0.65

.;T;T;T;.;.

M_CAP

Benign

0.020

MetaRNN

Benign

0.022

T;T;T;T;T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.0

L;L;L;L;L;L

PhyloP100

2.0

PrimateAI

Benign

0.24

PROVEAN

Benign

-0.52

N;.;N;N;N;N

REVEL

Benign

0.018

Sift

Benign

0.033

D;.;D;T;T;T

Sift4G

Benign

0.20

T;T;T;T;T;T

Polyphen

0.035

B;B;B;B;B;B

Vest4

0.097

MVP

0.68

MPC

0.16

ClinPred

0.022

GERP RS

3.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.4

Varity_R

0.037

gMVP

0.19

Mutation Taster

=95/5

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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