rs876657713

Positions:

• chr11-77207388-AAAATTGCAGAC-A

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_000260.4(MYO7A):​c.5845_5855delATTGCAGACAA​(p.Ile1949fs) variant causes a frameshift, splice region change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MYO7A NM_000260.4 frameshift, splice_region
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 8.87

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 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 11-77207388-AAAATTGCAGAC-A is Pathogenic according to our data. Variant chr11-77207388-AAAATTGCAGAC-A is described in ClinVar as [Pathogenic]. Clinvar id is 228380.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MYO7A	NM_000260.4	c.5845_5855delATTGCAGACAA	p.Ile1949fs	frameshift_variant, splice_region_variant	42/49	ENST00000409709.9	NP_000251.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MYO7A	ENST00000409709.9	c.5845_5855delATTGCAGACAA	p.Ile1949fs	frameshift_variant, splice_region_variant	42/49	1	NM_000260.4	ENSP00000386331.3
MYO7A	ENST00000458637.6	c.5731_5741delATTGCAGACAA	p.Ile1911fs	frameshift_variant, splice_region_variant	42/49	1		ENSP00000392185.2
MYO7A	ENST00000409619.6	c.5698_5708delATTGCAGACAA	p.Ile1900fs	frameshift_variant, splice_region_variant	43/50	1		ENSP00000386635.2
MYO7A	ENST00000458169.2	c.3271_3281delATTGCAGACAA	p.Ile1091fs	frameshift_variant, splice_region_variant	22/29	1		ENSP00000417017.2
MYO7A	ENST00000670577.1	n.*443_*453delATTGCAGACAA		splice_region_variant, non_coding_transcript_exon_variant	25/32			ENSP00000499323.1
MYO7A	ENST00000670577.1	n.*443_*453delATTGCAGACAA		3_prime_UTR_variant	25/32			ENSP00000499323.1

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Rare genetic deafness Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

May 05, 2015

The p.Ile1949fs variant in MYO7A has not been previously reported in individuals with hearing loss or Usher syndrome. It has not been identified in large popul ation studies, though the ability of these studies to accurately detect indels m ay be limited. This variant is predicted to cause a frameshift, which alters th e protein?s amino acid sequence beginning at position 1949 and leads to a premat ure termination codon 6 amino acids downstream. This alteration is then predicte d to lead to a truncated or absent protein. Loss of function of the MYO7A gene is an established disease mechanism in autosomal recessive Usher syndrome. In s ummary, this variant meets our criteria to be classified as pathogenic for autos omal recessive Usher syndrome (www.partners.org/personalizedmedicine/lmm), based on the predicted impact to the protein. -

Computational scores

Source: dbNSFP v4.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs876657713; hg19: chr11-76918433;