11-77162124-G-C

Variant names:

• chr11-77162124-G-C
• rs1269622956
• NM_000260.4:c.1348G>C

Variant summary

Our verdict is Pathogenic. The variant received 16 ACMG points: 16P and 0B. PM1 PM5 PP3_Strong PP5_Very_Strong

The NM_000260.4(MYO7A):​c.1348G>C​(p.Glu450Gln) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000118 in 1,445,774 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. E450V) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.000012 (0 hom.)
• Consequence: MYO7A NM_000260.4 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3 U:1
• Conservation: PhyloP100: 10.0
• Publications: 3 publications found

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 Gene-Disease associations (from GenCC):

• nonsyndromic genetic hearing loss

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• autosomal recessive nonsyndromic hearing loss 2

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), PanelApp Australia, Ambry Genetics, G2P
• Usher syndrome type 1

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, Orphanet, PanelApp Australia
• Usher syndrome type 1B

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
• autosomal dominant nonsyndromic hearing loss 11

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: Ambry Genetics, PanelApp Australia, Labcorp Genetics (formerly Invitae)
• autosomal dominant nonsyndromic hearing loss

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• hearing loss, autosomal recessive

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• Usher syndrome type 2

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 16 ACMG points.

• PM1: In a hotspot region, there are 5 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 7 uncertain in NM_000260.4
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr11-77162125-A-T is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 438678.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.992
• PP5: Variant 11-77162124-G-C is Pathogenic according to our data. Variant chr11-77162124-G-C is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 554415.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYO7A	NM_000260.4	c.1348G>C	p.Glu450Gln	missense_variant	Exon 13 of 49	ENST00000409709.9	NP_000251.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MYO7A	ENST00000409709.9	c.1348G>C	p.Glu450Gln	missense_variant	Exon 13 of 49	1	NM_000260.4	ENSP00000386331.3
MYO7A	ENST00000458637.6	c.1348G>C	p.Glu450Gln	missense_variant	Exon 13 of 49	1		ENSP00000392185.2
MYO7A	ENST00000409619.6	c.1315G>C	p.Glu439Gln	missense_variant	Exon 14 of 50	1		ENSP00000386635.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.0000118 AC: 17 AN: 1445774 Hom.: 0 Cov.: 31 AF XY: 0.0000139 AC XY: 10 AN XY: 717256

African (AFR) AF: 0.00 AC: 0 AN: 33224

American (AMR) AF: 0.00 AC: 0 AN: 42562

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25788

East Asian (EAS) AF: 0.00 AC: 0 AN: 39174

South Asian (SAS) AF: 0.00 AC: 0 AN: 82914

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52378

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5508

European-Non Finnish (NFE) AF: 0.0000154 AC: 17 AN: 1104354

Other (OTH) AF: 0.00 AC: 0 AN: 59872

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3 Uncertain:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:2

Mar 18, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces glutamic acid, which is acidic and polar, with glutamine, which is neutral and polar, at codon 450 of the MYO7A protein (p.Glu450Gln). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with Usher syndrome (PMID: 8900236; Invitae). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 554415). 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%. Experimental studies have shown that this missense change affects MYO7A function (PMID: 18700726). This variant disrupts the p.Glu450 amino acid residue in MYO7A. Other variant(s) that disrupt this residue have been observed in individuals with MYO7A-related conditions (Invitae), which suggests that this may be a clinically significant amino acid residue. For these reasons, this variant has been classified as Pathogenic. -

Jun 17, 2021

Institute of Medical Genetics and Applied Genomics, University Hospital Tübingen

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Usher syndrome type 1;C1832475:Autosomal dominant nonsyndromic hearing loss 11;C1838701:Autosomal recessive nonsyndromic hearing loss 2 Pathogenic:1

May 21, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

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

Oct 17, 2017

Counsyl

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

This submission and the accompanying classification are no longer maintained by the submitter. For more information on current observations and classification, please contact variantquestions@myriad.com. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.96
BayesDel_addAF	Pathogenic	0.50	D
BayesDel_noAF	Pathogenic	0.47
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.97	D;D;.;.
Eigen	Pathogenic	1.0
Eigen_PC	Pathogenic	0.92
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.97	D;D;D;D
M_CAP	Pathogenic	0.87	D
MetaRNN	Pathogenic	0.99	D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.6	H;.;H;.
PhyloP100		10
PrimateAI	Pathogenic	0.83	D
PROVEAN	Uncertain	-2.9	D;.;D;D
REVEL	Pathogenic	0.89
Sift	Pathogenic	0.0	D;.;D;D
Sift4G	Uncertain	0.0030	D;D;D;D
Polyphen		0.98	D;.;.;.
Vest4		0.96
MutPred		0.93		Loss of loop (P = 0.2897);Loss of loop (P = 0.2897);Loss of loop (P = 0.2897);.;
MVP		0.97
MPC		0.14
ClinPred		1.0	D
GERP RS		5.2
Varity_R		0.91
gMVP		0.84
Mutation Taster		=1/99	disease causing

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

Other links and lift over

dbSNP: rs1269622956; hg19: chr11-76873170;