11-77204065-A-G

Position:

• chr11-77204065-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The ENST00000409709.9(MYO7A):​c.5327-11A>G variant causes a splice polypyrimidine tract, intron change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). There are indicators that this mutation may affect the branch point..

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: MYO7A ENST00000409709.9 splice_polypyrimidine_tract, intron
• Scores: Splicing: ADA: 0.2439
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 B:1
• Conservation: PhyloP100: 8.80

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 Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: This place is a probable branch point but rather VUS (scored 5 / 10). Computational evidence support a benign effect (BayesDel_noAF=-0.26).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MYO7A	NM_000260.4	c.5327-11A>G		splice_polypyrimidine_tract_variant, intron_variant		ENST00000409709.9	NP_000251.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MYO7A	ENST00000409709.9	c.5327-11A>G		splice_polypyrimidine_tract_variant, intron_variant		1	NM_000260.4	ENSP00000386331

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1441200 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 714368

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Benign:1

Revision: criteria provided, conflicting classifications

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

Nov 02, 2014

The p.5327-11A>G variant in MYO7A has been identified by our laboratory in one i ndividual with a clinical diagnosis of Usher syndrome type I, who carried a seco nd pathogenic variant in the same gene. It was absent from large population stud ies. This variant is located in the 3' splice region but does not affect the inv ariant -1 and -2 positions. However, positions -3 and -5 to -12 are part of the splicing consensus sequence and variants involving these positions sometimes aff ect splicing. Although position -11 of the major splice consensus sequence is ty pically a T or C, this intron better matches a minor splice consensus sequence w hich very rarely has a G at -11. Therefore, this variant could impact splicing a nd lead to a disrupted transcript. In summary, although additional studies are r equired to fully establish its clinical significance, the p.5327-11A>G variant i s likely pathogenic. -

not provided Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 27, 2023

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.26
CADD	Benign	21
DANN	Benign	0.77
La Branchor		0.58
BranchPoint Hunter		5.0

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.24
SpliceAI score (max)		0.15		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: rs397516316; hg19: chr11-76915110;