rs1553850100

Positions:

• chr4-3493006-C-CGCCACTGGCAGCCACTCCT

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PVS1_Strong PM2 PP5_Moderate

The NM_173660.5(DOK7):​c.1021_1039dupGCCACTGGCAGCCACTCCT​(p.Ser347fs) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000142 in 1,410,594 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: DOK7 NM_173660.5 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 8.87

Genes affected

DOK7 (HGNC:26594): (docking protein 7) The protein encoded by this gene is essential for neuromuscular synaptogenesis. The protein functions in aneural activation of muscle-specific receptor kinase, which is required for postsynaptic differentiation, and in the subsequent clustering of the acetylcholine receptor in myotubes. This protein can also induce autophosphorylation of muscle-specific receptor kinase. Mutations in this gene are a cause of familial limb-girdle myasthenia autosomal recessive, which is also known as congenital myasthenic syndrome type 1B. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Sep 2009]

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. There are 12 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 4-3493006-C-CGCCACTGGCAGCCACTCCT is Pathogenic according to our data. Variant chr4-3493006-C-CGCCACTGGCAGCCACTCCT is described in ClinVar as [Pathogenic]. Clinvar id is 434960.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DOK7	NM_173660.5	c.1021_1039dupGCCACTGGCAGCCACTCCT	p.Ser347fs	frameshift_variant	7/7	ENST00000340083.6	NP_775931.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DOK7	ENST00000340083.6	c.1021_1039dupGCCACTGGCAGCCACTCCT	p.Ser347fs	frameshift_variant	7/7	1	NM_173660.5	ENSP00000344432.5
DOK7	ENST00000643608.1	c.589_607dupGCCACTGGCAGCCACTCCT	p.Ser203fs	frameshift_variant	5/8			ENSP00000495701.1
DOK7	ENST00000515886.5	c.91_109dupGCCACTGGCAGCCACTCCT	p.Ser37fs	frameshift_variant	4/4	2		ENSP00000492194.1
DOK7	ENST00000507039.5	c.*242_*260dupGCCACTGGCAGCCACTCCT		3_prime_UTR_variant	7/7	2		ENSP00000423614.1

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome AF: 0.00000142 AC: 2 AN: 1410594 Hom.: 0 Cov.: 111 AF XY: 0.00 AC XY: 0 AN XY: 698602

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: 0.00000183

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 34

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Congenital myasthenic syndrome 10 Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

Nov 10, 2015

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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: rs1553850100; hg19: chr4-3494733;