Genetic Variant DOK7:p.Ala251Ala (chr4-3489777-G-C) – ACMG Classification: Likely_benign (-3 pts)

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2BP4_ModerateBP6_ModerateBP7

The NM_173660.5(DOK7):c.753G>C(p.Ala251Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000127 in 1,572,710 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. A251A) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 7.0e-7 ( 0 hom. )

Consequence

DOK7
NM_173660.5 synonymous

Scores

Clinical Significance

Likely benign criteria provided, single submitter B:1

Conservation

PhyloP100: -2.31

Publications

10 publications found

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 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

DOK7 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.080601156).

BP6

Variant 4-3489777-G-C is Benign according to our data. Variant chr4-3489777-G-C is described in ClinVar as Likely_benign. ClinVar VariationId is 1589844.Status of the report is criteria_provided_single_submitter, 1 stars.

BP7

Synonymous conserved (PhyloP=-2.32 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

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
DOK7	NM_173660.5	MANE Select	c.753G>C	p.Ala251Ala	synonymous	Exon 6 of 7	NP_775931.3
DOK7	NM_001164673.2		c.742G>C	p.Gly248Arg	missense	Exon 6 of 7	NP_001158145.1
DOK7	NM_001301071.2		c.753G>C	p.Ala251Ala	synonymous	Exon 6 of 10	NP_001288000.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
DOK7	ENST00000340083.6	TSL:1 MANE Select	c.753G>C	p.Ala251Ala	synonymous	Exon 6 of 7	ENSP00000344432.5
DOK7	ENST00000513995.1	TSL:1	n.411G>C		non_coding_transcript_exon	Exon 2 of 3
DOK7	ENST00000507039.5	TSL:2	c.742G>C	p.Gly248Arg	missense	Exon 6 of 7	ENSP00000423614.1

Frequencies

GnomAD3 genomes

AF:

0.00000658

AC:

AN:

152016

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00000545

AC:

AN:

183538

AF XY:

0.0000102

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000356

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

7.04e-7

AC:

AN:

1420694

Hom.:

Cov.:

AF XY:

0.00000142

AC XY:

AN XY:

702748

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

32714

American (AMR)

AF:

0.0000255

AC:

AN:

39220

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25352

East Asian (EAS)

AF:

0.00

AC:

AN:

37534

South Asian (SAS)

AF:

0.00

AC:

AN:

80884

European-Finnish (FIN)

AF:

0.00

AC:

AN:

49542

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5718

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1090926

Other (OTH)

AF:

0.00

AC:

AN:

58804

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.625

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00000658

AC:

AN:

152016

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74254

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41364

American (AMR)

AF:

0.00

AC:

AN:

15276

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.000193

AC:

AN:

5184

South Asian (SAS)

AF:

0.00

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10616

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

67960

Other (OTH)

AF:

0.00

AC:

AN:

2088

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.625

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

341

Bravo

AF:

0.00000378

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

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

Benign:1

Jul 07, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.075

BayesDel_addAF

Uncertain

0.11

BayesDel_noAF

Uncertain

0.030

CADD

Benign

0.066

(source)

DANN

Benign

0.47

Eigen

Benign

-1.2

Eigen_PC

Benign

-1.4

FATHMM_MKL

Benign

0.0034

LIST_S2

Benign

0.32

M_CAP

Benign

0.034

MetaRNN

Benign

0.081

MetaSVM

Uncertain

-0.022

PhyloP100

-2.3

PROVEAN

Benign

0.28

REVEL

Benign

0.26

Sift

Pathogenic

0.0

Vest4

0.21

MutPred

0.13

Gain of MoRF binding (P = 0.0066)

MVP

0.49

ClinPred

0.031

GERP RS

-1.9

Mutation Taster

=99/1

polymorphism

(source)

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over