rs140562514

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 1P and 5B. PP2BP6BS2

The NM_002472.3(MYH8):c.4042G>A(p.Glu1348Lys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00132 in 1,614,214 control chromosomes in the GnomAD database, including 5 homozygotes. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00081 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0014 ( 5 hom. )

Consequence

MYH8
NM_002472.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:4

Conservation

PhyloP100: 7.75

Variant links:

Genes affected

MYH8 (HGNC:7578): (myosin heavy chain 8) Myosins are actin-based motor proteins that function in the generation of mechanical force in eukaryotic cells. Muscle myosins are heterohexamers composed of 2 myosin heavy chains and 2 pairs of nonidentical myosin light chains. This gene encodes a member of the class II or conventional myosin heavy chains, and functions in skeletal muscle contraction. This gene is predominantly expressed in fetal skeletal muscle. This gene is found in a cluster of myosin heavy chain genes on chromosome 17. A mutation in this gene results in trismus-pseudocamptodactyly syndrome. [provided by RefSeq, Sep 2009]

MYH8 links:

(HGNC:):

links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -4 ACMG points.

PP2

Missense variant where missense usually causes diseases, MYH8

BP6

Variant 17-10398580-C-T is Benign according to our data. Variant chr17-10398580-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 211564.We mark this variant Likely_benign, oryginal submissions are: {Benign=1, Uncertain_significance=2, Likely_benign=3}. Variant chr17-10398580-C-T is described in Lovd as [Likely_benign].

BS2

High AC in GnomAd at 124 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYH8	NM_002472.3 linkuse as main transcript	c.4042G>A	p.Glu1348Lys	missense_variant	30/40	ENST00000403437.2
MYHAS	NR_125367.1 linkuse as main transcript	n.77-7568C>T		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris
MYH8	ENST00000403437.2 linkuse as main transcript	c.4042G>A	p.Glu1348Lys	missense_variant	30/40	5	NM_002472.3	P1
	ENST00000399342.6 linkuse as main transcript	n.77-7568C>T		intron_variant, non_coding_transcript_variant		3
	ENST00000581304.1 linkuse as main transcript	n.53-7568C>T		intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes

AF:

0.000815

AC:

124

AN:

152204

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000579

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.0000941

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00144

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000688

AC:

173

AN:

251490

Hom.:

AF XY:

0.000633

AC XY:

AN XY:

135918

show subpopulations

Gnomad AFR exome

AF:

0.000492

Gnomad AMR exome

AF:

0.0000578

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.000139

Gnomad NFE exome

AF:

0.00134

Gnomad OTH exome

AF:

0.00130

GnomAD4 exome

AF:

0.00137

AC:

2004

AN:

1461892

Hom.:

Cov.:

AF XY:

0.00131

AC XY:

952

AN XY:

727248

show subpopulations

Gnomad4 AFR exome

AF:

0.000269

Gnomad4 AMR exome

AF:

0.000112

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000348

Gnomad4 FIN exome

AF:

0.000131

Gnomad4 NFE exome

AF:

0.00174

Gnomad4 OTH exome

AF:

0.000762

GnomAD4 genome

AF:

0.000814

AC:

124

AN:

152322

Hom.:

Cov.:

AF XY:

0.000685

AC XY:

AN XY:

74498

show subpopulations

Gnomad4 AFR

AF:

0.000577

Gnomad4 AMR

AF:

0.0000653

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.0000941

Gnomad4 NFE

AF:

0.00144

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.00115

Hom.:

Bravo

AF:

0.000759

TwinsUK

AF:

0.00108

AC:

ALSPAC

AF:

0.00259

AC:

ESP6500AA

AF:

0.000908

AC:

ESP6500EA

AF:

0.00163

AC:

ExAC

AF:

0.000667

AC:

EpiCase

AF:

0.00136

EpiControl

AF:

0.00101

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:4

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Uncertain:1Benign:1

Likely benign, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	Feb 21, 2017	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Ambry Genetics	Apr 06, 2022	The c.4042G>A (p.E1348K) alteration is located in exon 30 (coding exon 28) of the MYH8 gene. This alteration results from a G to A substitution at nucleotide position 4042, causing the glutamic acid (E) at amino acid position 1348 to be replaced by a lysine (K). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

not provided

Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Invitae	Dec 31, 2019	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Feb 12, 2020	- -

Hecht syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 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, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

MYH8-related disorder

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Oct 22, 2020

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.75

BayesDel_addAF

Uncertain

0.077

BayesDel_noAF

Pathogenic

0.33

Cadd

Pathogenic

Dann

Pathogenic

1.0

DEOGEN2

Uncertain

0.50

Eigen

Pathogenic

0.96

Eigen_PC

Pathogenic

0.90

FATHMM_MKL

Uncertain

0.94

LIST_S2

Pathogenic

0.99

M_CAP

Benign

0.068

MetaRNN

Uncertain

0.56

MetaSVM

Pathogenic

0.82

MutationAssessor

Pathogenic

4.0

MutationTaster

Benign

1.0

PrimateAI

Pathogenic

0.87

PROVEAN

Uncertain

-2.9

REVEL

Pathogenic

0.80

Sift

Pathogenic

0.0

Sift4G

Uncertain

0.058

Polyphen

0.99

Vest4

0.93

MVP

0.94

MPC

0.70

ClinPred

0.19

GERP RS

5.3

Varity_R

0.74

gMVP

0.49

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over