11-77204213-A-C

Position:

• chr11-77204213-A-C

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PM1 PM2 PP3_Strong PP5_Moderate

The NM_000260.4(MYO7A):​c.5464A>C​(p.Thr1822Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. T1822T) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: MYO7A NM_000260.4 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 8.83

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]

ACMG classification

Verdict is Pathogenic. Variant got 10 ACMG points.

• PM1: In a domain MyTH4 2 (size 149) in uniprot entity MYO7A_HUMAN there are 35 pathogenic changes around while only 11 benign (76%) in NM_000260.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.962
• PP5: Variant 11-77204213-A-C is Pathogenic according to our data. Variant chr11-77204213-A-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 178921.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYO7A	NM_000260.4	c.5464A>C	p.Thr1822Pro	missense_variant	39/49	ENST00000409709.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYO7A	ENST00000409709.9	c.5464A>C	p.Thr1822Pro	missense_variant	39/49	1	NM_000260.4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Rare genetic deafness Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Jun 21, 2013

The Thr1822Pro variant in MYO7A has not been reported in individuals affected wi th hearing loss or Usher syndrome. This variant has also not been identified in large European American and African American populations by the NHLBI Exome Sequ encing Project (http://evs.gs.washignton.edu/EVS), which increases the likelihoo d that the variant is pathogenic. However, we cannot exclude that it may be comm on in other populations. Computational analyses (biochemical amino acid properti es, conservation, AlignGVGD, PolyPhen2, and SIFT) suggest that the variant may i mpact the protein, though this information alone is not predictive enough to det ermine pathogenicity. This variant has been identified in trans with a pathogeni c MYO7A variant in this individual's affected son, which increases the likelihoo d of a pathogenic role for this variant. In summary, due to its absence in the g eneral population, the computational data, and its presence in trans with a path ogenic variant in an affected individual, this variant is likely to be pathogeni c, though additional studies are required to fully establish its clinical signif icance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Pathogenic	0.50	D
BayesDel_noAF	Pathogenic	0.48
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.91	D;.;.;D
Eigen	Pathogenic	0.84
Eigen_PC	Pathogenic	0.72
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	0.98	D;D;D;D
M_CAP	Pathogenic	0.80	D
MetaRNN	Pathogenic	0.96	D;D;D;D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Pathogenic	3.8	H;.;.;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.76	T
PROVEAN	Pathogenic	-5.9	D;D;D;D
REVEL	Pathogenic	0.96
Sift	Uncertain	0.0010	D;D;D;D
Sift4G	Pathogenic	0.0010	D;D;D;D
Polyphen		1.0	D;.;.;.
Vest4		0.81
MutPred		0.79		Loss of phosphorylation at T1822 (P = 0.1447);.;.;.;
MVP		0.99
MPC		0.53
ClinPred		1.0	D
GERP RS		4.7
Varity_R		0.99
gMVP		0.85

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

Other links and lift over

dbSNP: rs727504541; hg19: chr11-76915258;