Genetic Variant MYLK:p.Val709Met (chr3-123708713-C-T) – ACMG Classification: Benign (-13 pts)

Variant summary

Our verdict is Benign. The variant received -13 ACMG points: 0P and 13B. BP4_StrongBP6BS1BS2

The NM_053025.4(MYLK):c.2125G>A(p.Val709Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000202 in 1,613,980 control chromosomes in the GnomAD database, including 3 homozygotes. 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). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V709L) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00029 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00019 ( 3 hom. )

Consequence

MYLK
NM_053025.4 missense

Scores

Clinical Significance

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

Conservation

PhyloP100: -0.404

Publications

2 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 links:

MYLK-AS1 (HGNC:42440): (MYLK antisense RNA 1)

MYLK-AS1 links:

LOC105369194 (HGNC:):

LOC105369194 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -13 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.03850293).

BP6

Variant 3-123708713-C-T is Benign according to our data. Variant chr3-123708713-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 471707.

BS1

Variant frequency is greater than expected in population amr. GnomAd4 allele frequency = 0.000289 (44/152232) while in subpopulation AMR AF = 0.0017 (26/15284). AF 95% confidence interval is 0.00119. There are 0 homozygotes in GnomAd4. There are 26 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAdExome4 at 3 AD,AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_053025.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
MYLK	NM_053025.4	MANE Select	c.2125G>A	p.Val709Met	missense	Exon 15 of 34	NP_444253.3
MYLK	NM_053027.4		c.2125G>A	p.Val709Met	missense	Exon 15 of 33	NP_444255.3
MYLK	NM_053026.4		c.1918G>A	p.Val640Met	missense	Exon 14 of 33	NP_444254.3

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
MYLK	ENST00000360304.8	TSL:5 MANE Select	c.2125G>A	p.Val709Met	missense	Exon 15 of 34	ENSP00000353452.3
MYLK	ENST00000464489.5	TSL:1	n.*1704G>A		non_coding_transcript_exon	Exon 14 of 33	ENSP00000417798.1
MYLK	ENST00000464489.5	TSL:1	n.*1704G>A		3_prime_UTR	Exon 14 of 33	ENSP00000417798.1

Frequencies

GnomAD3 genomes

AF:

0.000289

AC:

AN:

152232

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000965

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00170

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:

0.000206

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000223

AC:

AN:

251012

AF XY:

0.000133

show subpopulations

Gnomad AFR exome

AF:

0.000123

Gnomad AMR exome

AF:

0.00101

Gnomad ASJ exome

AF:

0.000298

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000106

Gnomad OTH exome

AF:

0.000652

GnomAD4 exome

AF:

0.000193

AC:

282

AN:

1461748

Hom.:

Cov.:

AF XY:

0.000173

AC XY:

126

AN XY:

727172

show subpopulations

African (AFR)

AF:

0.000149

AC:

AN:

33480

American (AMR)

AF:

0.000961

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.000344

AC:

AN:

26136

East Asian (EAS)

AF:

0.0000504

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000464

AC:

AN:

86256

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53308

Middle Eastern (MID)

AF:

0.000173

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

0.000181

AC:

201

AN:

1111990

Other (OTH)

AF:

0.000282

AC:

AN:

60390

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

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:

0.000289

AC:

AN:

152232

Hom.:

Cov.:

AF XY:

0.000350

AC XY:

AN XY:

74372

show subpopulations

African (AFR)

AF:

0.0000965

AC:

AN:

41464

American (AMR)

AF:

0.00170

AC:

AN:

15284

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5196

South Asian (SAS)

AF:

0.00

AC:

AN:

4834

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10622

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.000206

AC:

AN:

68038

Other (OTH)

AF:

0.00

AC:

AN:

2094

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.497

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:

0.000263

Hom.:

Bravo

AF:

0.000370

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000519

AC:

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.000222

AC:

EpiCase

AF:

0.000164

EpiControl

AF:

0.0000593

ClinVar

ClinVar submissions as Germline

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (2)

Aortic aneurysm, familial thoracic 7 (1)

Familial thoracic aortic aneurysm and aortic dissection (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.24

BayesDel_addAF

Benign

-0.41

BayesDel_noAF

Benign

-0.42

CADD

Benign

(source)

DANN

Benign

0.97

DEOGEN2

Benign

0.21

Eigen

Benign

-0.85

Eigen_PC

Benign

-0.87

FATHMM_MKL

Benign

0.024

LIST_S2

Benign

0.75

M_CAP

Benign

0.025

MetaRNN

Benign

0.039

MetaSVM

Benign

-0.96

MutationAssessor

Benign

1.2

PhyloP100

-0.40

PrimateAI

Benign

0.27

PROVEAN

Benign

-0.070

REVEL

Benign

0.025

Sift

Benign

0.12

Sift4G

Benign

0.39

Polyphen

0.050

Vest4

0.28

MVP

0.61

MPC

0.20

ClinPred

0.017

GERP RS

0.63

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.029

gMVP

0.20

Mutation Taster

=100/0

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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over