rs142974032

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2PP3

The NM_017433.5(MYO3A):c.2918G>A(p.Arg973Gln) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000496 in 1,613,938 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R973W) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000085 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000046 ( 1 hom. )

Consequence

MYO3A
NM_017433.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 8.15

Variant links:

Genes affected

MYO3A (HGNC:7601): (myosin IIIA) The protein encoded by this gene belongs to the myosin superfamily. Myosins are actin-dependent motor proteins and are categorized into conventional myosins (class II) and unconventional myosins (classes I and III through XV) based on their variable C-terminal cargo-binding domains. Class III myosins, such as this one, have a kinase domain N-terminal to the conserved N-terminal motor domains and are expressed in photoreceptors. The protein encoded by this gene plays an important role in hearing in humans. Three different recessive, loss of function mutations in the encoded protein have been shown to cause nonsyndromic progressive hearing loss. Expression of this gene is highly restricted, with the strongest expression in retina and cochlea. [provided by RefSeq, Jul 2008]

MYO3A links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.761

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYO3A	NM_017433.5 linkuse as main transcript	c.2918G>A	p.Arg973Gln	missense_variant	26/35	ENST00000642920.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYO3A	ENST00000642920.2 linkuse as main transcript	c.2918G>A	p.Arg973Gln	missense_variant	26/35		NM_017433.5	P1	Q8NEV4-1
MYO3A	ENST00000543632.5 linkuse as main transcript	c.1777-54409G>A		intron_variant		1
MYO3A	ENST00000642197.1 linkuse as main transcript	n.3122G>A		non_coding_transcript_exon_variant	26/27
MYO3A	ENST00000647478.1 linkuse as main transcript	c.*913G>A		3_prime_UTR_variant, NMD_transcript_variant	24/30

Frequencies

GnomAD3 genomes

AF:

0.0000855

AC:

AN:

152094

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000623

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000119

AC:

AN:

251236

Hom.:

AF XY:

0.000147

AC XY:

AN XY:

135786

show subpopulations

Gnomad AFR exome

AF:

0.000308

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

Gnomad SAS exome

AF:

0.000751

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000881

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000458

AC:

AN:

1461844

Hom.:

Cov.:

AF XY:

0.0000674

AC XY:

AN XY:

727224

show subpopulations

Gnomad4 AFR exome

AF:

0.000149

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.000649

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000180

Gnomad4 OTH exome

AF:

0.0000497

GnomAD4 genome

AF:

0.0000855

AC:

AN:

152094

Hom.:

Cov.:

AF XY:

0.0000942

AC XY:

AN XY:

74306

show subpopulations

Gnomad4 AFR

AF:

0.000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000623

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000329

Hom.:

Bravo

AF:

0.0000491

ESP6500AA

AF:

0.000454

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000140

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Mar 20, 2016

The p.Arg973Gln variant in MYO3A has not been previously reported in individuals with hearing loss, but has been identified in 12/16510 of South Asian chromosom es and 5/10406 of African chromosomes by the Exome Aggregation Consortium (ExAC, http://exac.broadinstitute.org; dbSNP rs142974032). Although this variant has b een seen in the general population, its frequency is not high enough to rule out a pathogenic role. Computational prediction tools and conservation analysis sug gest that the p.Arg973Gln variant may impact the protein, though this informatio n is not predictive enough to determine pathogenicity. In summary, the clinical significance of the p.Arg973Gln variant is uncertain. -

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 15, 2022

The c.2918G>A (p.R973Q) alteration is located in exon 26 (coding exon 24) of the MYO3A gene. This alteration results from a G to A substitution at nucleotide position 2918, causing the arginine (R) at amino acid position 973 to be replaced by a glutamine (Q). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Aug 10, 2023

This variant has not been reported in the literature in individuals affected with MYO3A-related conditions. ClinVar contains an entry for this variant (Variation ID: 228982). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt MYO3A protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. This variant is present in population databases (rs142974032, gnomAD 0.08%). This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 973 of the MYO3A protein (p.Arg973Gln). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.14

BayesDel_addAF

Uncertain

0.15

BayesDel_noAF

Pathogenic

0.36

Cadd

Pathogenic

Dann

Pathogenic

1.0

DEOGEN2

Uncertain

0.54

D;D

Eigen

Pathogenic

0.85

Eigen_PC

Pathogenic

0.80

FATHMM_MKL

Pathogenic

0.98

M_CAP

Uncertain

0.14

MetaRNN

Pathogenic

0.76

D;D

MetaSVM

Uncertain

0.77

MutationAssessor

Benign

1.9

L;L

MutationTaster

Benign

1.0

D;D

PrimateAI

Uncertain

0.57

Polyphen

1.0

D;D

Vest4

0.88

MVP

0.95

MPC

0.24

ClinPred

0.30

GERP RS

5.1

Varity_R

0.75

gMVP

0.71

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