dbSNP rs779508279: DOK7:p.Leu447_Arg451del (chr4-3493322-TGGCTGGGCACGAGAC-T) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2PM4

The NM_173660.5(DOK7):c.1340_1354delTGGGCACGAGACGGC(p.Leu447_Arg451del) variant causes a disruptive inframe deletion change. The variant allele was found at a frequency of 0.0000368 in 1,603,934 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000066 ( 0 hom., cov: 34)

Exomes 𝑓: 0.000034 ( 0 hom. )

Consequence

DOK7
NM_173660.5 disruptive_inframe_deletion

Scores

Not classified

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 4.44

Variant links:

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]

DOK7 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PM4

Nonframeshift variant in NON repetitive region in NM_173660.5.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DOK7	NM_173660.5 link	c.1340_1354delTGGGCACGAGACGGC	p.Leu447_Arg451del	disruptive_inframe_deletion	Exon 7 of 7	ENST00000340083.6	NP_775931.3	Q18PE1-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
DOK7	ENST00000340083.6 link	c.1340_1354delTGGGCACGAGACGGC	p.Leu447_Arg451del	disruptive_inframe_deletion	Exon 7 of 7	1	NM_173660.5	ENSP00000344432.5	Q18PE1-1
DOK7	ENST00000643608.1 link	c.908_922delTGGGCACGAGACGGC	p.Leu303_Arg307del	disruptive_inframe_deletion	Exon 5 of 8			ENSP00000495701.1	A0A2R8Y701
DOK7	ENST00000515886.5 link	c.410_424delTGGGCACGAGACGGC	p.Leu137_Arg141del	disruptive_inframe_deletion	Exon 4 of 4	2		ENSP00000492194.1	A0A1W2PRA3
DOK7	ENST00000507039.5 link	c.561_575delTGGGCACGAGACGGC		3_prime_UTR_variant	Exon 7 of 7	2		ENSP00000423614.1	Q18PE1-4

Frequencies

GnomAD3 genomes

AF:

0.0000657

AC:

AN:

152196

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000523

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000364

AC:

AN:

219718

Hom.:

AF XY:

0.0000576

AC XY:

AN XY:

121546

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000137

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000424

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000338

AC:

AN:

1451738

Hom.:

AF XY:

0.0000347

AC XY:

AN XY:

721222

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000685

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000117

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000316

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000657

AC:

AN:

152196

Hom.:

Cov.:

AF XY:

0.0000807

AC XY:

AN XY:

74354

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.000523

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000843

Hom.:

Bravo

AF:

0.000162

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Jun 26, 2019

Revvity Omics, Revvity

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

The DOK7 p.Leu137_Arg141del variant was not identified in the literature but was identified in dbSNP (ID: rs779508279) and ClinVar (classified as uncertain significance by Invitae). The variant was identified in control databases in 10 of 251084 chromosomes at a frequency of 0.00003983 (Genome Aggregation Database March 6, 2019, v2.1.1). The variant was observed in the following populations: South Asian in 4 of 29126 chromosomes (freq: 0.000137), European (non-Finnish) in 5 of 109750 chromosomes (freq: 0.000046) and Latino in 1 of 33670 chromosomes (freq: 0.00003), but was not observed in the African, Ashkenazi Jewish, East Asian, European (Finnish), or Other populations. This variant is an in-frame deletion resulting in the removal of codons 137 to 141; the impact of this alteration on DOK7 protein function is not known. The variant occurs outside of the splicing consensus sequence and three of four in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer) do not predict a difference in splicing. In summary, based on the above information the clinical significance of this variant cannot be determined with certainty at this time. This variant is classified as a variant of uncertain significance. -

Fetal akinesia deformation sequence 1;C1850792:Congenital myasthenic syndrome 10

Uncertain:1

Jul 27, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant, c.1340_1354del, results in the deletion of 5 amino acid(s) of the DOK7 protein (p.Leu447_Arg451del), but otherwise preserves the integrity of the reading frame. This variant is present in population databases (rs779508279, gnomAD 0.01%). This variant has not been reported in the literature in individuals affected with DOK7-related conditions. ClinVar contains an entry for this variant (Variation ID: 465675). Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

Splicing

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over