rs761899995

Variant names:

• chr4-3493119-CG-C
• rs761899995
• NM_173660.5:c.1138delG

Your query was ambiguous. Multiple possible variants found:

• chr4-3493119-CG-C
• chr4-3493119-CG-CGG

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_001301071.2(DOK7):​c.1138delG​(p.Ala380ProfsTer76) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000487 in 1,437,254 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. A380A) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 0.0000049 (0 hom.)
• Consequence: DOK7 NM_001301071.2 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: -1.09
• Publications: 1 publications found

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 Gene-Disease associations (from GenCC):

• congenital myasthenic syndrome 10

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), PanelApp Australia
• fetal akinesia deformation sequence 3

  Inheritance: AR Classification: STRONG, LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• fetal akinesia deformation sequence 1

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• postsynaptic congenital myasthenic syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 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 4-3493119-CG-C is Pathogenic according to our data. Variant chr4-3493119-CG-C is described in ClinVar as Pathogenic. ClinVar VariationId is 2674892.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001301071.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DOK7	NM_173660.5	MANE Select	c.1138delG	p.Ala380ProfsTer76	frameshift	Exon 7 of 7	NP_775931.3
	DOK7	NM_001301071.2		c.1138delG	p.Ala380ProfsTer76	frameshift	Exon 7 of 10	NP_001288000.1
	DOK7	NM_001363811.2		c.706delG	p.Ala236ProfsTer76	frameshift	Exon 5 of 8	NP_001350740.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DOK7	ENST00000340083.6	TSL:1 MANE Select	c.1138delG	p.Ala380ProfsTer76	frameshift	Exon 7 of 7	ENSP00000344432.5
	DOK7	ENST00000643608.1		c.706delG	p.Ala236ProfsTer76	frameshift	Exon 5 of 8	ENSP00000495701.1
	DOK7	ENST00000515886.5	TSL:2	c.208delG	p.Ala70ProfsTer76	frameshift	Exon 4 of 4	ENSP00000492194.1

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome AF: 0.00000487 AC: 7 AN: 1437254 Hom.: 0 Cov.: 113 AF XY: 0.00000701 AC XY: 5 AN XY: 713656

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.0000303 AC: 1 AN: 33056

American (AMR) AF: 0.00 AC: 0 AN: 41804

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25736

East Asian (EAS) AF: 0.00 AC: 0 AN: 38280

South Asian (SAS) AF: 0.00 AC: 0 AN: 83612

European-Finnish (FIN) AF: 0.0000216 AC: 1 AN: 46240

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5750

European-Non Finnish (NFE) AF: 0.00000453 AC: 5 AN: 1103292

Other (OTH) AF: 0.00 AC: 0 AN: 59484

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000699038), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 34

ClinVar

ClinVar submissions as Germline

Significance: Pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	Fetal akinesia deformation sequence 3 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		-1.1
Mutation Taster		=6/194	disease causing

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

Other links and lift over

dbSNP: rs761899995; hg19: chr4-3494846;