rs138148221

Variant names:

• chr4-3492907-C-G
• rs138148221
• NM_173660.5:c.921C>G

Your query was ambiguous. Multiple possible variants found:

• chr4-3492907-C-G
• chr4-3492907-C-T

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.921C>G​(p.Ala307Ala) variant causes a synonymous change involving the alteration of a non-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 Likely benign (★). Synonymous variant affecting the same amino acid position (i.e. A307A) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: DOK7 NM_173660.5 synonymous
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -2.83
• Publications: 0 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 4-3492907-C-G is Benign according to our data. Variant chr4-3492907-C-G is described in ClinVar as Likely_benign. ClinVar VariationId is 2938657.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP7: Synonymous conserved (PhyloP=-2.83 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.921C>G	p.Ala307Ala	synonymous	Exon 7 of 7	NP_775931.3
	DOK7	NM_001301071.2		c.921C>G	p.Ala307Ala	synonymous	Exon 7 of 10	NP_001288000.1
	DOK7	NM_001363811.2		c.489C>G	p.Ala163Ala	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.921C>G	p.Ala307Ala	synonymous	Exon 7 of 7	ENSP00000344432.5
	DOK7	ENST00000643608.1		c.489C>G	p.Ala163Ala	synonymous	Exon 5 of 8	ENSP00000495701.1
	DOK7	ENST00000515886.5	TSL:2	c.-10C>G		5_prime_UTR	Exon 4 of 4	ENSP00000492194.1

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1422448 Hom.: 0 Cov.: 111 AF XY: 0.00 AC XY: 0 AN XY: 704772

African (AFR) AF: 0.00 AC: 0 AN: 32622

American (AMR) AF: 0.00 AC: 0 AN: 39210

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25470

East Asian (EAS) AF: 0.00 AC: 0 AN: 37320

South Asian (SAS) AF: 0.00 AC: 0 AN: 82168

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 45504

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5722

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1095412

Other (OTH) AF: 0.00 AC: 0 AN: 59020

GnomAD4 genome Cov.: 34

ClinVar

ClinVar submissions as Germline

Significance: Likely benign

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	-	1	Fetal akinesia deformation sequence 1;C1850792:Congenital myasthenic syndrome 10 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.86
CADD	Benign	0.0080
DANN	Benign	0.52
PhyloP100		-2.8

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: rs138148221; hg19: chr4-3494634;