NM_173660.5:c.331+27G>T

Variant names:

• chr4-3473663-G-T
• rs77051823
• NM_173660.5:c.331+27G>T

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_173660.5(DOK7):​c.331+27G>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000146 in 1,367,144 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000015 (0 hom.)
• Consequence: DOK7 NM_173660.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -3.95
• 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 -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.91).

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.331+27G>T		intron	N/A	NP_775931.3
	DOK7	NM_001301071.2		c.331+27G>T		intron	N/A	NP_001288000.1
	DOK7	NM_001363811.2		c.100+10112G>T		intron	N/A	NP_001350740.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DOK7	ENST00000340083.6	TSL:1 MANE Select	c.331+27G>T		intron	N/A	ENSP00000344432.5
	DOK7	ENST00000643608.1		c.100+10112G>T		intron	N/A	ENSP00000495701.1
	DOK7	ENST00000507039.5	TSL:2	c.331+27G>T		intron	N/A	ENSP00000423614.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000146 AC: 2 AN: 1367144 Hom.: 0 Cov.: 33 AF XY: 0.00000150 AC XY: 1 AN XY: 668482

African (AFR) AF: 0.00 AC: 0 AN: 31174

American (AMR) AF: 0.00 AC: 0 AN: 34984

Ashkenazi Jewish (ASJ) AF: 0.0000417 AC: 1 AN: 23954

East Asian (EAS) AF: 0.00 AC: 0 AN: 35280

South Asian (SAS) AF: 0.00 AC: 0 AN: 76434

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 46898

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 3950

European-Non Finnish (NFE) AF: 9.45e-7 AC: 1 AN: 1057970

Other (OTH) AF: 0.00 AC: 0 AN: 56500

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.91
CADD	Benign	0.23
DANN	Benign	0.33
PhyloP100		-4.0

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: rs77051823; hg19: chr4-3475390;