4-3493456-G-C

Variant names:

• chr4-3493456-G-C
• rs543344505
• NM_173660.5:c.1470G>C

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 2P and 7B. PM2 BP4_Strong BP6_Moderate BP7

The NM_173660.5(DOK7):​c.1470G>C​(p.Ser490Ser) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000206 in 1,457,750 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★). Synonymous variant affecting the same amino acid position (i.e. S490S) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 35)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: DOK7 NM_173660.5 synonymous
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -0.606
• 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: Likely_benign. The variant received -5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.86).
• BP6: Variant 4-3493456-G-C is Benign according to our data. Variant chr4-3493456-G-C is described in ClinVar as Likely_benign. ClinVar VariationId is 514538.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP7: Synonymous conserved (PhyloP=-0.606 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_173660.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DOK7	NM_173660.5	MANE Select	c.1470G>C	p.Ser490Ser	synonymous	Exon 7 of 7	NP_775931.3
	DOK7	NM_001301071.2		c.1470G>C	p.Ser490Ser	synonymous	Exon 7 of 10	NP_001288000.1
	DOK7	NM_001363811.2		c.1038G>C	p.Ser346Ser	synonymous	Exon 5 of 8	NP_001350740.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DOK7	ENST00000340083.6	TSL:1 MANE Select	c.1470G>C	p.Ser490Ser	synonymous	Exon 7 of 7	ENSP00000344432.5
	DOK7	ENST00000643608.1		c.1038G>C	p.Ser346Ser	synonymous	Exon 5 of 8	ENSP00000495701.1
	DOK7	ENST00000515886.5	TSL:2	c.540G>C	p.Ser180Ser	synonymous	Exon 4 of 4	ENSP00000492194.1

Frequencies

GnomAD3 genomes Cov.: 35

GnomAD2 exomes AF: 0.00000425 AC: 1 AN: 235338 AF XY: 0.00000771

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 FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000970

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000206 AC: 3 AN: 1457750 Hom.: 0 Cov.: 87 AF XY: 0.00000276 AC XY: 2 AN XY: 724968

African (AFR) AF: 0.00 AC: 0 AN: 33418

American (AMR) AF: 0.00 AC: 0 AN: 44530

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26062

East Asian (EAS) AF: 0.00 AC: 0 AN: 39592

South Asian (SAS) AF: 0.00 AC: 0 AN: 85820

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 51632

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5704

European-Non Finnish (NFE) AF: 0.00000270 AC: 3 AN: 1110804

Other (OTH) AF: 0.00 AC: 0 AN: 60188

GnomAD4 genome Cov.: 35

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Benign:1

Jan 09, 2018

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.86
CADD	Benign	1.0
DANN	Benign	0.50
PhyloP100		-0.61

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: rs543344505; hg19: chr4-3495183;