rs150007422

Positions:

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 1P and 2B. PP2BP4_Moderate

The NM_053025.4(MYLK):c.2461C>T(p.Arg821Trp) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000209 in 1,613,924 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/23 in silico tools predict a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00016 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00021 ( 0 hom. )

Consequence

MYLK
NM_053025.4 missense, splice_region

Scores

Splicing: ADA: 0.0003451

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:8

Conservation

PhyloP100: 0.614

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:

(HGNC:):

links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -1 ACMG points.

PP2

Missense variant in gene, where missense usually causes diseases (based on misZ statistic), MYLK. . Gene score misZ 1.1317 (greater than the threshold 3.09). Trascript score misZ 3.1503 (greater than threshold 3.09). GenCC has associacion of gene with familial thoracic aortic aneurysm and aortic dissection, connective tissue disorder, megacystis-microcolon-intestinal hypoperistalsis syndrome, aortic aneurysm, familial thoracic 7.

BP4

Computational evidence support a benign effect (MetaRNN=0.17499173).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MYLK	NM_053025.4 linkuse as main transcript	c.2461C>T	p.Arg821Trp	missense_variant, splice_region_variant	17/34	ENST00000360304.8	NP_444253.3
LOC105369194	XR_924417.4 linkuse as main transcript	n.108-2427G>A		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MYLK	ENST00000360304.8 linkuse as main transcript	c.2461C>T	p.Arg821Trp	missense_variant, splice_region_variant	17/34	5	NM_053025.4	ENSP00000353452	P4	Q15746-1
	ENST00000685586.1 linkuse as main transcript	n.132G>A		non_coding_transcript_exon_variant	1/3

Frequencies

GnomAD3 genomes

AF:

0.000164

AC:

AN:

152122

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000145

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:

0.0000942

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000250

Gnomad OTH

AF:

0.000479

GnomAD3 exomes

AF:

0.000171

AC:

AN:

251454

Hom.:

AF XY:

0.000169

AC XY:

AN XY:

135912

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.0000578

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000653

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000334

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000214

AC:

313

AN:

1461802

Hom.:

Cov.:

AF XY:

0.000215

AC XY:

156

AN XY:

727200

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000447

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.0000187

Gnomad4 NFE exome

AF:

0.000273

Gnomad4 OTH exome

AF:

0.0000662

GnomAD4 genome

AF:

0.000164

AC:

AN:

152122

Hom.:

Cov.:

AF XY:

0.0000942

AC XY:

AN XY:

74308

show subpopulations

Gnomad4 AFR

AF:

0.000145

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.0000942

Gnomad4 NFE

AF:

0.000250

Gnomad4 OTH

AF:

0.000479

Alfa

AF:

0.000244

Hom.:

Bravo

AF:

0.000162

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.000259

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000465

AC:

ExAC

AF:

0.000165

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.000109

EpiControl

AF:

0.000237

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:8

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:4

Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Sep 25, 2024	Reported in two individuals from a Dutch cohort of patients evaluated for heritable thoracic aortic disorders; a seven year old with pulmonary embolism and prominent venous pattern, and an adult with a history of aortic aneurysms and an atrial septal defect (PMID: 29907982); Identified in a patient with Marfan syndrome in published literature (PMID: 30675029); this patient harbored additional cardiogenetic variants (PMID: 30675029); In silico analysis indicates that this missense variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 29907982, 30675029) -
Uncertain significance, no assertion criteria provided	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	-	- -
Uncertain significance, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	-	- -
Uncertain significance, no assertion criteria provided	clinical testing	Genome Diagnostics Laboratory, Amsterdam University Medical Center	-	- -

Aortic aneurysm, familial thoracic 7

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 17, 2024	This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 821 of the MYLK protein (p.Arg821Trp). This variant is present in population databases (rs150007422, gnomAD 0.03%). This missense change has been observed in individual(s) with hereditary thoracic aortic disease (PMID: 29907982). ClinVar contains an entry for this variant (Variation ID: 342890). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Not Available"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Not Available". The tryptophan amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect 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. -
Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 12, 2018	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

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 14, 2023

The p.R821W variant (also known as c.2461C>T), located in coding exon 14 of the MYLK gene, results from a C to T substitution at nucleotide position 2461. The arginine at codon 821 is replaced by tryptophan, an amino acid with dissimilar properties. This variant has been reported in thoracic aortic aneurysm and dissection (TAAD) cohorts; however, clinical details were limited and/or co-occurring variants in other TAAD-related genes were detected (Overwater E et al. Hum. Mutat., 2018 09;39:1173-1192; Renner S et al. Genet Med. 2019 Aug;21(8):1832-1841). This amino acid position is not well conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Aortic aneurysm, familial thoracic 7;C5542316:Megacystis-microcolon-intestinal hypoperistalsis syndrome 1

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Aug 13, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.42

BayesDel_addAF

Benign

-0.29

BayesDel_noAF

Benign

-0.34

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Benign

0.37

.;.;.;T;.;T

Eigen

Benign

-0.55

Eigen_PC

Benign

-0.69

FATHMM_MKL

Benign

0.097

LIST_S2

Uncertain

0.87

.;D;D;D;.;.

M_CAP

Benign

0.057

MetaRNN

Benign

0.17

T;T;T;T;T;T

MetaSVM

Benign

-0.71

MutationAssessor

Benign

1.4

L;.;L;L;.;L

MutationTaster

Benign

1.0

N;N;N;N;N

PrimateAI

Benign

0.35

PROVEAN

Benign

-2.3

N;.;N;N;N;N

REVEL

Benign

0.19

Sift

Uncertain

0.0010

D;.;D;D;D;D

Sift4G

Uncertain

0.0020

D;D;D;D;D;D

Polyphen

1.0

D;D;D;D;D;D

Vest4

0.23

MVP

0.73

MPC

0.43

ClinPred

0.13

GERP RS

-0.35

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.058

gMVP

0.18

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.00035

dbscSNV1_RF

Benign

0.022

SpliceAI score (max)

0.10

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