Genetic Variant MYH13:p.Arg1824Leu (chr17-10303494-C-A) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_003802.3(MYH13):c.5471G>T(p.Arg1824Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,432 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R1824Q) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

MYH13
NM_003802.3 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.659

Publications

0 publications found

Variant links:

Genes affected

MYH13 (HGNC:7571): (myosin heavy chain 13) Predicted to enable microfilament motor activity. Predicted to be involved in muscle contraction. Predicted to act upstream of or within cellular response to starvation. Located in extracellular exosome. [provided by Alliance of Genome Resources, Apr 2022]

MYH13 links:

MYHAS (HGNC:50609): (myosin heavy chain gene cluster antisense RNA) Predicted to enable primary miRNA binding activity. Predicted to be involved in response to muscle activity and skeletal muscle fiber development. Predicted to act upstream of or within with a positive effect on gene expression. Predicted to be located in cytoplasm and nucleus. [provided by Alliance of Genome Resources, Apr 2022]

MYHAS links:

LOC107985004 (HGNC:):

LOC107985004 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYH13	NM_003802.3 link	c.5471G>T	p.Arg1824Leu	missense_variant	Exon 38 of 41	ENST00000252172.9	NP_003793.2	Q9UKX3
LOC107985004	XR_001752791.3 link	n.95+11581C>A		intron_variant	Intron 1 of 4
LOC107985004	XR_007065617.1 link	n.95+11581C>A		intron_variant	Intron 1 of 4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MYH13	ENST00000252172.9 link	c.5471G>T	p.Arg1824Leu	missense_variant	Exon 38 of 41	1	NM_003802.3	ENSP00000252172.4		Q9UKX3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461432

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727032

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

33474

American (AMR)

AF:

0.00

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86254

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53402

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

9.00e-7

AC:

AN:

1111616

Other (OTH)

AF:

0.00

AC:

AN:

60362

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.375

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.27

BayesDel_addAF

Uncertain

0.076

BayesDel_noAF

Benign

-0.13

CADD

Benign

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.48

T;T;T

Eigen

Uncertain

0.28

Eigen_PC

Benign

0.080

FATHMM_MKL

Benign

0.57

LIST_S2

Uncertain

0.95

.;D;.

M_CAP

Benign

0.024

MetaRNN

Uncertain

0.67

D;D;D

MetaSVM

Uncertain

0.071

MutationAssessor

Pathogenic

3.9

H;H;H

PhyloP100

0.66

PrimateAI

Benign

0.38

PROVEAN

Pathogenic

-4.5

.;.;D

REVEL

Uncertain

0.50

Sift

Pathogenic

0.0

.;.;D

Sift4G

Uncertain

0.0040

D;D;D

Polyphen

0.95

P;P;P

Vest4

0.52

MutPred

0.63

Loss of MoRF binding (P = 0.0246);Loss of MoRF binding (P = 0.0246);Loss of MoRF binding (P = 0.0246);

MVP

0.78

MPC

0.14

ClinPred

0.98

GERP RS

1.9

Varity_R

0.54

gMVP

0.34

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over