20-31819581-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PVS1_SupportingPM2

The NM_033118.4(MYLK2):ā€‹c.1A>Gā€‹(p.Met1?) variant causes a start lost change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000143 in 1,399,244 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (ā˜…).

Frequency

Genomes: not found (cov: 32)
Exomes š‘“: 0.0000014 ( 0 hom. )

Consequence

MYLK2
NM_033118.4 start_lost

Scores

4
6
6

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 2.86
Variant links:
Genes affected
MYLK2 (HGNC:16243): (myosin light chain kinase 2) This gene encodes a myosin light chain kinase, a calcium/calmodulin dependent enzyme, that is exclusively expressed in adult skeletal muscle. [provided by RefSeq, Jul 2008]

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 3 ACMG points.

PVS1
Start lost variant, no pathogenic variants between lost start and next in-frame start position. Next in-frame start position is after 540 CDS bases. Genomic position: 31821505. Lost 0.302 part of the original CDS.
PM2
Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene Transcript HGVSc HGVSp Effect Exon rank MANE Protein UniProt
MYLK2NM_033118.4 linkc.1A>G p.Met1? start_lost Exon 2 of 13 ENST00000375985.5 NP_149109.1 Q9H1R3

Ensembl

Gene Transcript HGVSc HGVSp Effect Exon rank TSL MANE Protein Appris UniProt
MYLK2ENST00000375985.5 linkc.1A>G p.Met1? start_lost Exon 2 of 13 1 NM_033118.4 ENSP00000365152.4 Q9H1R3
MYLK2ENST00000375994.6 linkc.1A>G p.Met1? start_lost Exon 1 of 12 1 ENSP00000365162.2 Q9H1R3

Frequencies

GnomAD3 genomes
Cov.:
32
GnomAD4 exome
AF:
0.00000143
AC:
2
AN:
1399244
Hom.:
0
Cov.:
31
AF XY:
0.00000145
AC XY:
1
AN XY:
690102
show subpopulations
Gnomad4 AFR exome
AF:
0.00
Gnomad4 AMR exome
AF:
0.00
Gnomad4 ASJ exome
AF:
0.00
Gnomad4 EAS exome
AF:
0.00
Gnomad4 SAS exome
AF:
0.0000126
Gnomad4 FIN exome
AF:
0.00
Gnomad4 NFE exome
AF:
9.27e-7
Gnomad4 OTH exome
AF:
0.00
GnomAD4 genome
Cov.:
32

ClinVar

Significance: Uncertain significance
Submissions summary: Uncertain:1
Revision: criteria provided, single submitter
LINK: link

Submissions by phenotype

not provided Uncertain:1
Sep 03, 2024
GeneDx
Significance: Uncertain significance
Review Status: criteria provided, single submitter
Collection Method: clinical testing

Has not been previously published as pathogenic or benign to our knowledge; Not observed at significant frequency in large population cohorts (gnomAD); Initiation codon variant in a gene for which loss-of-function is not a known mechanism of disease -

Computational scores

Source: dbNSFP v4.3

Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Pathogenic
0.23
D
BayesDel_noAF
Uncertain
0.090
CADD
Benign
23
DANN
Uncertain
0.99
DEOGEN2
Benign
0.26
T;T
Eigen
Uncertain
0.20
Eigen_PC
Benign
0.19
FATHMM_MKL
Uncertain
0.87
D
LIST_S2
Uncertain
0.90
.;D
M_CAP
Pathogenic
0.74
D
MetaRNN
Pathogenic
0.99
D;D
MetaSVM
Benign
-0.46
T
PROVEAN
Benign
-0.74
N;N
REVEL
Uncertain
0.45
Sift
Pathogenic
0.0
D;D
Sift4G
Benign
0.33
T;T
Polyphen
0.71
P;P
Vest4
0.65
MutPred
1.0
Gain of catalytic residue at E4 (P = 0.1784);Gain of catalytic residue at E4 (P = 0.1784);
MVP
0.67
ClinPred
0.89
D
GERP RS
3.5
Varity_R
0.82
gMVP
0.036

Splicing

Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
0.030
Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr20-30407384; API