NM_053025.4:c.1802A>C

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.1802A>C(p.His601Pro) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000192 in 1,565,274 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 16/24 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 Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. H601R) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 34)

Exomes 𝑓: 0.000018 ( 1 hom. )

Consequence

MYLK
NM_053025.4 missense, splice_region

Scores

Splicing: ADA: 0.00001114

Clinical Significance

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

Conservation

PhyloP100: 0.750

Publications

3 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=0.048481107).

BP6

Variant 3-123722130-T-G is Benign according to our data. Variant chr3-123722130-T-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 264001.

BS1

Variant frequency is greater than expected in population amr. GnomAdExome4 allele frequency = 0.0000184 (26/1413022) while in subpopulation AMR AF = 0.00066 (25/37872). AF 95% confidence interval is 0.000459. There are 1 homozygotes in GnomAdExome4. There are 11 alleles in the male GnomAdExome4 subpopulation. Median coverage is 42. This position passed quality control check.

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.1802A>C	p.His601Pro	missense splice_region	Exon 13 of 34	NP_444253.3
MYLK	NM_053027.4		c.1802A>C	p.His601Pro	missense splice_region	Exon 13 of 33	NP_444255.3
MYLK	NM_053026.4		c.1595A>C	p.His532Pro	missense splice_region	Exon 12 of 33	NP_444254.3

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
MYLK	ENST00000360304.8	TSL:5 MANE Select	c.1802A>C	p.His601Pro	missense splice_region	Exon 13 of 34	ENSP00000353452.3
MYLK	ENST00000464489.5	TSL:1	n.*1381A>C		splice_region non_coding_transcript_exon	Exon 12 of 33	ENSP00000417798.1
MYLK	ENST00000464489.5	TSL:1	n.*1381A>C		3_prime_UTR	Exon 12 of 33	ENSP00000417798.1

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152252

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000262

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:

0.000127

AC:

AN:

173830

AF XY:

0.000108

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000816

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:

0.00

GnomAD4 exome

AF:

0.0000184

AC:

AN:

1413022

Hom.:

Cov.:

AF XY:

0.0000158

AC XY:

AN XY:

698350

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

32258

American (AMR)

AF:

0.000660

AC:

AN:

37872

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25280

East Asian (EAS)

AF:

0.00

AC:

AN:

36906

South Asian (SAS)

AF:

0.00

AC:

AN:

79970

European-Finnish (FIN)

AF:

0.00

AC:

AN:

49576

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5718

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1086860

Other (OTH)

AF:

0.0000171

AC:

AN:

58582

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.444

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:

0.0000263

AC:

AN:

152252

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74380

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41472

American (AMR)

AF:

0.000262

AC:

AN:

15294

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3468

East Asian (EAS)

AF:

0.00

AC:

AN:

5194

South Asian (SAS)

AF:

0.00

AC:

AN:

4834

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10632

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68040

Other (OTH)

AF:

0.00

AC:

AN:

2090

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

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:

0.00

Hom.:

Bravo

AF:

0.0000567

ExAC

AF:

0.000102

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Familial thoracic aortic aneurysm and aortic dissection

Uncertain:1

Aug 20, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The p.H601P variant (also known as c.1802A>C), located in coding exon 10 of the MYLK gene, results from an A to C substitution at nucleotide position 1802. The histidine at codon 601 is replaced by proline, an amino acid with similar properties. This amino acid position is poorly conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Based on the available evidence, the clinical significance of this variant remains unclear.

Aortic aneurysm, familial thoracic 7

Benign:1

Mar 27, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.54

BayesDel_addAF

Benign

-0.29

BayesDel_noAF

Benign

-0.27

CADD

Benign

(source)

DANN

Benign

0.28

DEOGEN2

Benign

0.21

Eigen

Benign

-0.94

Eigen_PC

Benign

-1.0

FATHMM_MKL

Benign

0.20

LIST_S2

Benign

0.80

M_CAP

Benign

0.049

MetaRNN

Benign

0.048

MetaSVM

Benign

-0.91

MutationAssessor

Benign

1.1

PhyloP100

0.75

PrimateAI

Benign

0.22

PROVEAN

Benign

-0.65

REVEL

Uncertain

0.31

Sift

Benign

0.15

Sift4G

Uncertain

0.033

Polyphen

0.45

Vest4

0.51

MutPred

0.48

Gain of sheet (P = 0.0125)

MVP

0.62

MPC

0.25

ClinPred

0.045

GERP RS

-0.84

Varity_R

0.31

gMVP

0.83

Mutation Taster

=74/26

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.000011

dbscSNV1_RF

Benign

0.0020

SpliceAI score (max)

0.050

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

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over