rs782396605

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1PM2PM5PP3_Moderate

The NM_000260.4(MYO7A):c.1997G>A(p.Arg666Gln) variant causes a missense change. The variant allele was found at a frequency of 0.0000161 in 1,613,040 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 (★★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R666P) has been classified as Pathogenic.

Frequency

Genomes: 𝑓 0.000085 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000089 ( 0 hom. )

Consequence

MYO7A
NM_000260.4 missense

Scores

Clinical Significance

Uncertain significance reviewed by expert panel U:6

Conservation

PhyloP100: 6.52

Variant links:

Genes affected

MYO7A (HGNC:7606): (myosin VIIA) This gene is a member of the myosin gene family. Myosins are mechanochemical proteins characterized by the presence of a motor domain, an actin-binding domain, a neck domain that interacts with other proteins, and a tail domain that serves as an anchor. This gene encodes an unconventional myosin with a very short tail. Defects in this gene are associated with the mouse shaker-1 phenotype and the human Usher syndrome 1B which are characterized by deafness, reduced vestibular function, and (in human) retinal degeneration. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2008]

MYO7A links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

PM1

In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 6 uncertain in NM_000260.4

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr11-77174817-G-C is described in ClinVar as [Pathogenic]. Clinvar id is 813194.Status of the report is criteria_provided_single_submitter, 1 stars.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.891

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYO7A	NM_000260.4 linkuse as main transcript	c.1997G>A	p.Arg666Gln	missense_variant	17/49	ENST00000409709.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYO7A	ENST00000409709.9 linkuse as main transcript	c.1997G>A	p.Arg666Gln	missense_variant	17/49	1	NM_000260.4		Q13402-1
MYO7A	ENST00000458637.6 linkuse as main transcript	c.1997G>A	p.Arg666Gln	missense_variant	17/49	1		P1	Q13402-2
MYO7A	ENST00000409619.6 linkuse as main transcript	c.1964G>A	p.Arg655Gln	missense_variant	18/50	1			Q13402-8
MYO7A	ENST00000409893.6 linkuse as main transcript	c.62G>A	p.Arg21Gln	missense_variant	1/11	5

Frequencies

GnomAD3 genomes

AF:

0.0000854

AC:

AN:

152244

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000265

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:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000203

AC:

AN:

246412

Hom.:

AF XY:

0.0000149

AC XY:

AN XY:

134202

show subpopulations

Gnomad AFR exome

AF:

0.000132

Gnomad AMR exome

AF:

0.0000291

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000898

Gnomad OTH exome

AF:

0.000167

GnomAD4 exome

AF:

0.00000890

AC:

AN:

1460678

Hom.:

Cov.:

AF XY:

0.00000551

AC XY:

AN XY:

726516

show subpopulations

Gnomad4 AFR exome

AF:

0.0000896

Gnomad4 AMR exome

AF:

0.0000224

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:

0.00000360

Gnomad4 OTH exome

AF:

0.0000829

GnomAD4 genome

AF:

0.0000853

AC:

AN:

152362

Hom.:

Cov.:

AF XY:

0.0000939

AC XY:

AN XY:

74508

show subpopulations

Gnomad4 AFR

AF:

0.000265

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:

0.0000294

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000254

Hom.:

Bravo

AF:

0.0000604

ExAC

AF:

0.00000828

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:6

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

Usher syndrome type 1

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Mendelics	Apr 21, 2023	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center	Mar 25, 2024	- -

Usher syndrome

Uncertain:1

Uncertain significance, reviewed by expert panel

curation

ClinGen Hearing Loss Variant Curation Expert Panel

May 20, 2020

The c.1997G>A (p.Arg666Gln) variant in MYO7A is present in 10/42046 (0.012% CI 95%) of African alleles in gnomAD v3, which is a low enough frequency to award PM2_Supporting based on the thresholds defined by the ClinGen Hearing Loss Expert Panel for autosomal recessive Usher syndrome (PM2_Supporting). This variant has been detected in 1 proband with Usher syndrome, however, they carried another VUS with phase unknown (PM3_Supporting not met; ClinVar ID: 196099; PMIDs: 27460420, 31479088). The REVEL computational prediction analysis tool produced a score of 0.841, which is above the threshold necessary to apply PP3. In summary, the clinical significance of this variant is uncertain. ACMG/AMP criteria applied, as specified by the Hearing Loss Expert Panel: PM2_Supporting, PP3. -

Usher syndrome type 1;C1838701:Autosomal recessive nonsyndromic hearing loss 2

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Counsyl

Feb 28, 2018

- -

Usher syndrome type 1B

Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

Natera, Inc.

Jan 16, 2020

- -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Sep 13, 2022

This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 666 of the MYO7A protein (p.Arg666Gln). This variant is present in population databases (rs782396605, gnomAD 0.01%). This missense change has been observed in individual(s) with Usher syndrome, deafness (PMID: 27344577, 27460420, 31479088, 33297549). ClinVar contains an entry for this variant (Variation ID: 556881). 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) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on MYO7A 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.41

BayesDel_addAF

Pathogenic

0.17

BayesDel_noAF

Pathogenic

0.24

Cadd

Pathogenic

Dann

Pathogenic

1.0

DEOGEN2

Pathogenic

0.89

D;T;.;.;.

Eigen

Pathogenic

0.82

Eigen_PC

Pathogenic

0.78

FATHMM_MKL

Uncertain

0.92

LIST_S2

Uncertain

0.94

D;D;D;D;D

M_CAP

Pathogenic

0.32

MetaRNN

Pathogenic

0.89

D;D;D;D;D

MetaSVM

Uncertain

0.49

MutationAssessor

Uncertain

2.6

M;.;M;.;.

MutationTaster

Benign

1.0

D;D;D;D

PrimateAI

Uncertain

0.79

PROVEAN

Uncertain

-3.4

D;.;D;D;.

REVEL

Pathogenic

0.84

Sift

Benign

0.035

D;.;D;D;.

Sift4G

Uncertain

0.018

D;D;D;D;.

Polyphen

1.0

D;.;.;.;.

Vest4

0.61

MVP

0.94

MPC

0.48

ClinPred

0.93

GERP RS

5.2

Varity_R

0.60

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