rs55760507

Positions:

• chr3-123739964-G-C

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_Strong BP6_Very_Strong BP7 BA1

The NM_053025.4(MYLK):​c.411C>G​(p.Ser137=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00756 in 1,613,896 control chromosomes in the GnomAD database, including 538 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★). Synonymous variant affecting the same amino acid position (i.e. S137S) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.034 (289 hom., cov: 33)
  • Exomes 𝑓: 0.0048 (249 hom.)
• Consequence: MYLK NM_053025.4 synonymous
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:11
• Conservation: PhyloP100: 2.08

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]

ACMG classification

Verdict is Benign. Variant got -21 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.57).
• BP6: Variant 3-123739964-G-C is Benign according to our data. Variant chr3-123739964-G-C is described in ClinVar as [Benign]. Clinvar id is 226766.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr3-123739964-G-C is described in Lovd as [Benign].
• BP7: Synonymous conserved (PhyloP=2.08 with no splicing effect.
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.108 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYLK	NM_053025.4	c.411C>G	p.Ser137=	synonymous_variant	6/34	ENST00000360304.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYLK	ENST00000360304.8	c.411C>G	p.Ser137=	synonymous_variant	6/34	5	NM_053025.4	P4

Frequencies

GnomAD3 genomes AF: 0.0333 AC: 5061 AN: 152162 Hom.: 278 Cov.: 33

Gnomad AFR AF: 0.110

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0168

Gnomad ASJ AF: 0.0179

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00166

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.0380

Gnomad NFE AF: 0.00163

Gnomad OTH AF: 0.0335

GnomAD3 exomes AF: 0.0106 AC: 2671 AN: 251442 Hom.: 120 AF XY: 0.00827 AC XY: 1124 AN XY: 135890

Gnomad AFR exome AF: 0.115

Gnomad AMR exome AF: 0.00971

Gnomad ASJ exome AF: 0.0179

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000621

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00190

Gnomad OTH exome AF: 0.00815

GnomAD4 exome AF: 0.00485 AC: 7083 AN: 1461616 Hom.: 249 Cov.: 31 AF XY: 0.00452 AC XY: 3287 AN XY: 727112

Gnomad4 AFR exome AF: 0.111

Gnomad4 AMR exome AF: 0.0116

Gnomad4 ASJ exome AF: 0.0192

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.000615

Gnomad4 FIN exome AF: 0.0000187

Gnomad4 NFE exome AF: 0.00142

Gnomad4 OTH exome AF: 0.0107

GnomAD4 genome AF: 0.0336 AC: 5114 AN: 152280 Hom.: 289 Cov.: 33 AF XY: 0.0320 AC XY: 2382 AN XY: 74468

Gnomad4 AFR AF: 0.111

Gnomad4 AMR AF: 0.0167

Gnomad4 ASJ AF: 0.0179

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00145

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00163

Gnomad4 OTH AF: 0.0332

Alfa AF: 0.0126 Hom.: 24

Bravo AF: 0.0396

Asia WGS AF: 0.0120 AC: 42 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:11

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:6

Benign, no assertion criteria provided	clinical testing	Genome Diagnostics Laboratory, Amsterdam University Medical Center	-	- -
Benign, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Apr 04, 2013	Ser137Ser in exon 6 of MYLK: This variant is not expected to have clinical signi ficance because it does not alter an amino acid residue and is not located withi n the splice consensus sequence. It has been identified in 10.3% (452/4406) of A frican American chromosomes from a broad population by the NHLBI Exome Sequencin g Project (http://evs.gs.washington.edu/EVS; dbSNP rs55760507). -
Benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Aug 16, 2019	- -
Benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	-	- -
Benign, no assertion criteria provided	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	-	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Oct 03, 2016	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Aortic aneurysm, familial thoracic 7 Benign:2

Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 31, 2024	- -
Benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 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 and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Familial thoracic aortic aneurysm and aortic dissection Benign:2

Benign, criteria provided, single submitter	clinical testing	Ambry Genetics	Feb 03, 2015	This alteration is classified as benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -
Benign, criteria provided, single submitter	clinical testing	CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario	Nov 17, 2022	- -

not provided Benign:1

Benign, criteria provided, single submitter

not provided

Breakthrough Genomics, Breakthrough Genomics

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- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.57
CADD	Benign	6.6
DANN	Benign	0.91

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

Other links and lift over

dbSNP: rs55760507; hg19: chr3-123458811;