rs397516321

Positions:

• chr11-77205598-C-T

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PM1 PM2 PM5 PP3_Strong PP5_Very_Strong

The NM_000260.4(MYO7A):​c.5617C>T​(p.Arg1873Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000992 in 1,613,400 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 (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R1873Q) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: 𝑓 0.000013 (0 hom., cov: 33)
  • Exomes 𝑓: 0.0000096 (0 hom.)
• Consequence: MYO7A NM_000260.4 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:7
• Conservation: PhyloP100: 0.865

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 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PM1: In a helix (size 13) in uniprot entity MYO7A_HUMAN there are 4 pathogenic changes around while only 0 benign (100%) 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 chr11-77205599-G-A is described in Lovd as [Likely_pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.963
• PP5: Variant 11-77205598-C-T is Pathogenic according to our data. Variant chr11-77205598-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 43291.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr11-77205598-C-T is described in Lovd as [Pathogenic]. Variant chr11-77205598-C-T is described in Lovd as [Likely_pathogenic]. Variant chr11-77205598-C-T is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MYO7A	NM_000260.4	c.5617C>T	p.Arg1873Trp	missense_variant	40/49	ENST00000409709.9	NP_000251.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MYO7A	ENST00000409709.9	c.5617C>T	p.Arg1873Trp	missense_variant	40/49	1	NM_000260.4	ENSP00000386331.3
MYO7A	ENST00000458637.6	c.5503C>T	p.Arg1835Trp	missense_variant	40/49	1		ENSP00000392185.2
MYO7A	ENST00000409619.6	c.5470C>T	p.Arg1824Trp	missense_variant	41/50	1		ENSP00000386635.2
MYO7A	ENST00000458169.2	c.3043C>T	p.Arg1015Trp	missense_variant	20/29	1		ENSP00000417017.2
MYO7A	ENST00000670577.1	n.*215C>T		non_coding_transcript_exon_variant	23/32			ENSP00000499323.1
MYO7A	ENST00000670577.1	n.*215C>T		3_prime_UTR_variant	23/32			ENSP00000499323.1

Frequencies

GnomAD3 genomes AF: 0.0000131 AC: 2 AN: 152192 Hom.: 0 Cov.: 33

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: 0.0000294

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.0000121 AC: 3 AN: 247820 Hom.: 0 AF XY: 0.0000148 AC XY: 2 AN XY: 134694

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000112

Gnomad SAS exome AF: 0.0000328

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000958 AC: 14 AN: 1461208 Hom.: 0 Cov.: 32 AF XY: 0.0000124 AC XY: 9 AN XY: 726882

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000504

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.0000188

Gnomad4 NFE exome AF: 0.00000720

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome AF: 0.0000131 AC: 2 AN: 152192 Hom.: 0 Cov.: 33 AF XY: 0.0000134 AC XY: 1 AN XY: 74358

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: 0.0000294

Gnomad4 OTH AF: 0.00

Alfa AF: 0.0000680 Hom.: 0

Bravo AF: 0.0000340

ExAC AF: 0.00000827 AC: 1

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:7

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	Athena Diagnostics	Feb 17, 2021	The frequency of this variant in the general population is consistent with pathogenicity (http://gnomad.broadinstitute.org). This variant segregates with disease in multiple families. In multiple individuals, this variant has been seen with a single recessive pathogenic variant in the same gene, suggesting this variant may also be pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Apr 12, 2019	In silico analysis, which includes protein predictors and evolutionary conservation, supports a deleterious effect; This variant is associated with the following publications: (PMID: 28944237, 28472130, 27460420, 25558175, 16679490, 18484607, 21738395) -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Dec 18, 2023	This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 1873 of the MYO7A protein (p.Arg1873Trp). This variant is present in population databases (rs397516321, gnomAD 0.01%). This missense change has been observed in individuals with Usher syndrome (PMID: 16679490, 25558175, 27460420, 29142287). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 43291). 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 expected to disrupt MYO7A protein function with a positive predictive value of 95%. For these reasons, this variant has been classified as Pathogenic. -

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

Likely pathogenic, criteria provided, single submitter

clinical testing

Counsyl

Aug 18, 2017

- -

Usher syndrome Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Jul 28, 2023

Variant summary: MYO7A c.5617C>T (p.Arg1873Trp) results in a non-conservative amino acid change located in the MyTH4 domain (IPR000857) of the encoded protein sequence. This alters a highly conserved residue (HGMD) in which another missense change (p.Arg1873Gln) has been classified as pathogenic (ClinVar). Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 1.2e-05 in 247820 control chromosomes (gnomAD). c.5617C>T has been reported in the literature in multiple individuals affected with Usher Syndrome (Bahena_2022, Bonnet_2016, Mansard_2021), and some were reported as compound heterozygous with (likely) pathogenic variants. These data indicate that the variant is very likely to be associated with disease. The following publications have been ascertained in the context of this evaluation (PMID: 34948090, 34148116, 27460420). Five submitters have cited clinical-significance assessments for this variant to ClinVar after 2014. All submitters classified the variant as pathogenic/likely pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -

Usher syndrome type 1B Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

Natera, Inc.

Mar 02, 2021

- -

Rare genetic deafness Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Mar 09, 2011

The Arg1873Trp variant in MYO7A has been reported in five probands with Usher sy ndrome type 1 and has not been identified in 1176 control chromosomes (Roux 2006 , Baux 2008-unpublished data). All of these probands were homozygous or compound heterozygous. In summary, this variant meets our criteria to be classified as p athogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.29	D
BayesDel_noAF	Pathogenic	0.41
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.91	D;.;.;D
Eigen	Uncertain	0.45
Eigen_PC	Uncertain	0.30
FATHMM_MKL	Uncertain	0.82	D
LIST_S2	Pathogenic	0.97	D;D;D;D
M_CAP	Pathogenic	0.53	D
MetaRNN	Pathogenic	0.96	D;D;D;D
MetaSVM	Pathogenic	0.96	D
MutationAssessor	Pathogenic	3.3	M;.;.;.
PrimateAI	Pathogenic	0.83	D
PROVEAN	Pathogenic	-7.6	D;D;D;D
REVEL	Pathogenic	0.89
Sift	Pathogenic	0.0	D;D;D;D
Sift4G	Pathogenic	0.0	D;D;D;D
Polyphen		1.0	D;.;.;.
Vest4		0.93
MutPred		0.82		Loss of disorder (P = 0.026);.;.;.;
MVP		0.98
MPC		0.42
ClinPred		1.0	D
GERP RS		1.1
Varity_R		0.96
gMVP		0.83

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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

Other links and lift over

dbSNP: rs397516321; hg19: chr11-76916643;