rs121913623

Positions:

chr17-10648592-C-T

Variant summary

Our verdict is Pathogenic. Variant got 15 ACMG points: 15P and 0B. PM2PP2PP3_StrongPP5_Very_Strong

The NM_002470.4(MYH3):c.700G>A(p.Ala234Thr) variant causes a missense change. The variant allele was found at a frequency of 0.00000124 in 1,613,930 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 Likely pathogenic (★★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

MYH3
NM_002470.4 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3

Conservation

PhyloP100: 6.16

Variant links:

Genes affected

MYH3 (HGNC:7573): (myosin heavy chain 3) Myosin is a major contractile protein which converts chemical energy into mechanical energy through the hydrolysis of ATP. Myosin is a hexameric protein composed of a pair of myosin heavy chains (MYH) and two pairs of nonidentical light chains. This gene is a member of the MYH family and encodes a protein with an IQ domain and a myosin head-like domain. Mutations in this gene have been associated with two congenital contracture (arthrogryposis) syndromes, Freeman-Sheldon syndrome and Sheldon-Hall syndrome. [provided by RefSeq, Jul 2008]

MYH3 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 15 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP2

Missense variant in gene, where missense usually causes diseases (based on misZ statistic), MYH3. . Gene score misZ 1.7445 (greater than the threshold 3.09). Trascript score misZ 4.649 (greater than threshold 3.09). GenCC has associacion of gene with spondylocarpotarsal synostosis syndrome, contractures, pterygia, and variable skeletal fusions syndrome 1B, contractures, pterygia, and spondylocarpotarsal fusion syndrome 1A, digitotalar dysmorphism, autosomal recessive multiple pterygium syndrome, Freeman-Sheldon syndrome, distal arthrogryposis type 2B1, Sheldon-hall syndrome.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.992

PP5

Variant 17-10648592-C-T is Pathogenic according to our data. Variant chr17-10648592-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 14145.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr17-10648592-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
MYH3	NM_002470.4 linkuse as main transcript	c.700G>A	p.Ala234Thr	missense_variant	8/41	ENST00000583535.6	NP_002461.2
MYH3	XM_011523870.4 linkuse as main transcript	c.700G>A	p.Ala234Thr	missense_variant	8/41		XP_011522172.1
MYH3	XM_011523871.3 linkuse as main transcript	c.700G>A	p.Ala234Thr	missense_variant	8/41		XP_011522173.1
MYH3	XM_047436127.1 linkuse as main transcript	c.700G>A	p.Ala234Thr	missense_variant	10/43		XP_047292083.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MYH3	ENST00000583535.6 linkuse as main transcript	c.700G>A	p.Ala234Thr	missense_variant	8/41	5	NM_002470.4	ENSP00000464317	P1
MYH3	ENST00000579489.2 linkuse as main transcript			downstream_gene_variant		5

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152142

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461788

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727210

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:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

8.99e-7

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152142

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74302

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Jun 10, 2024

Published functional studies using a Drosophila model demonstrate disrupted myofibril assembly and stability, limited viability, and hindered flight and jump ability of the transgenic flies (PMID: 32799913); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 23401156, 22519952, 18695058, 32799913) -

Freeman-Sheldon syndrome;C1867440:Contractures, pterygia, and spondylocarpotarsal fusion syndrome 1A;C5193014:Distal arthrogryposis type 2B1

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Oct 31, 2018

- -

Arthrogryposis, distal, type 2B3

Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Aug 01, 2008

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.98

BayesDel_addAF

Pathogenic

0.42

BayesDel_noAF

Pathogenic

0.36

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.93

Eigen

Pathogenic

0.96

Eigen_PC

Pathogenic

0.78

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Uncertain

0.96

M_CAP

Pathogenic

0.41

MetaRNN

Pathogenic

0.99

MetaSVM

Pathogenic

1.1

MutationAssessor

Pathogenic

4.6

MutationTaster

Benign

1.0

A;A

PrimateAI

Pathogenic

0.83

Sift4G

Pathogenic

0.0010

Polyphen

0.99

Vest4

0.96

MutPred

0.96

Loss of catalytic residue at A234 (P = 0.053);

MVP

0.88

MPC

1.9

ClinPred

0.98

GERP RS

4.6

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.62

gMVP

0.77

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