Genetic Variant MYLK:c.4620-6C>T (chr3-123640510-G-A) – 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.4620-6C>T variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00183 in 1,613,804 control chromosomes in the GnomAD database, including 7 homozygotes. In-silico tool predicts 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 Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.0019 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0018 ( 7 hom. )

Consequence

MYLK
NM_053025.4 splice_region, intron

Scores

Splicing: ADA: 0.002411

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:11

Conservation

PhyloP100: 0.683

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:

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 (BayesDel_noAF=-0.7).

BP6

Variant 3-123640510-G-A is Benign according to our data. Variant chr3-123640510-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 227625.

BS1

Variant frequency is greater than expected in population amr. GnomAd4 allele frequency = 0.00188 (286/152288) while in subpopulation AMR AF = 0.00372 (57/15306). AF 95% confidence interval is 0.00295. There are 0 homozygotes in GnomAd4. There are 143 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAdExome4 at 7 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	Effect	Exon Rank	Protein
MYLK	NM_053025.4	MANE Select	c.4620-6C>T	splice_region intron	N/A	NP_444253.3
MYLK	NM_053027.4		c.4620-6C>T	splice_region intron	N/A	NP_444255.3
MYLK	NM_053026.4		c.4413-6C>T	splice_region intron	N/A	NP_444254.3

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein	UniProt
MYLK	ENST00000360304.8	TSL:5 MANE Select	c.4620-6C>T	splice_region intron	N/A	ENSP00000353452.3	Q15746-1
MYLK	ENST00000464489.5	TSL:1	n.*4199-6C>T	splice_region intron	N/A	ENSP00000417798.1	F8WBL7
MYLK	ENST00000687848.1		c.4650-6C>T	splice_region intron	N/A	ENSP00000508761.1	A0A8I5KU53

Frequencies

GnomAD3 genomes

AF:

0.00187

AC:

285

AN:

152170

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000265

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00373

Gnomad ASJ

AF:

0.00403

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000621

Gnomad FIN

AF:

0.00104

Gnomad MID

AF:

0.00316

Gnomad NFE

AF:

0.00273

Gnomad OTH

AF:

0.000956

GnomAD2 exomes

AF:

0.00184

AC:

461

AN:

250856

AF XY:

0.00179

show subpopulations

Gnomad AFR exome

AF:

0.000431

Gnomad AMR exome

AF:

0.00249

Gnomad ASJ exome

AF:

0.00447

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00102

Gnomad NFE exome

AF:

0.00232

Gnomad OTH exome

AF:

0.00408

GnomAD4 exome

AF:

0.00182

AC:

2661

AN:

1461516

Hom.:

Cov.:

AF XY:

0.00183

AC XY:

1332

AN XY:

727068

show subpopulations

African (AFR)

AF:

0.000448

AC:

AN:

33470

American (AMR)

AF:

0.00228

AC:

102

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00367

AC:

AN:

26136

East Asian (EAS)

AF:

0.0000252

AC:

AN:

39698

South Asian (SAS)

AF:

0.000661

AC:

AN:

86250

European-Finnish (FIN)

AF:

0.00116

AC:

AN:

53406

Middle Eastern (MID)

AF:

0.00788

AC:

AN:

5458

European-Non Finnish (NFE)

AF:

0.00194

AC:

2155

AN:

1112010

Other (OTH)

AF:

0.00215

AC:

130

AN:

60364

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.489

Heterozygous variant carriers

165

329

494

658

823

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

136

204

272

340

<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:

0.00188

AC:

286

AN:

152288

Hom.:

Cov.:

AF XY:

0.00192

AC XY:

143

AN XY:

74470

show subpopulations

African (AFR)

AF:

0.000265

AC:

AN:

41570

American (AMR)

AF:

0.00372

AC:

AN:

15306

Ashkenazi Jewish (ASJ)

AF:

0.00403

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5166

South Asian (SAS)

AF:

0.000829

AC:

AN:

4824

European-Finnish (FIN)

AF:

0.00104

AC:

AN:

10610

Middle Eastern (MID)

AF:

0.00340

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00273

AC:

186

AN:

68022

Other (OTH)

AF:

0.000946

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.489

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:

0.00243

Hom.:

Bravo

AF:

0.00193

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.00229

EpiControl

AF:

0.00243

ClinVar

ClinVar submissions

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (5)

not specified (4)

Aortic aneurysm, familial thoracic 7 (2)

Familial thoracic aortic aneurysm and aortic dissection (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.70

CADD

Benign

3.2

(source)

DANN

Benign

0.86

PhyloP100

0.68

Mutation Taster

=99/1

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.0024

dbscSNV1_RF

Benign

0.042

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

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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