chr4-3489785-C-T

Position:

• chr4-3489785-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001256896.2(DOK7):​c.-170C>T variant causes a 5 prime UTR premature start codon gain change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000102 in 1,574,150 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: 𝑓 0.00014 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000098 (1 hom.)
• Consequence: DOK7 NM_001256896.2 5_prime_UTR_premature_start_codon_gain
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 1.06

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 (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.05622843).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DOK7	NM_173660.5	c.761C>T	p.Pro254Leu	missense_variant	6/7	ENST00000340083.6	NP_775931.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DOK7	ENST00000340083.6	c.761C>T	p.Pro254Leu	missense_variant	6/7	1	NM_173660.5	ENSP00000344432.5

Frequencies

GnomAD3 genomes AF: 0.000138 AC: 21 AN: 152040 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000483

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000327

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000193

Gnomad SAS AF: 0.000415

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000147

Gnomad OTH AF: 0.000478

GnomAD3 exomes AF: 0.000150 AC: 28 AN: 186064 Hom.: 0 AF XY: 0.000201 AC XY: 20 AN XY: 99580

Gnomad AFR exome AF: 0.0000915

Gnomad AMR exome AF: 0.000281

Gnomad ASJ exome AF: 0.000114

Gnomad EAS exome AF: 0.000140

Gnomad SAS exome AF: 0.000324

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000646

Gnomad OTH exome AF: 0.000611

GnomAD4 exome AF: 0.0000978 AC: 139 AN: 1421992 Hom.: 1 Cov.: 32 AF XY: 0.000111 AC XY: 78 AN XY: 703516

Gnomad4 AFR exome AF: 0.0000916

Gnomad4 AMR exome AF: 0.000329

Gnomad4 ASJ exome AF: 0.0000394

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000371

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000696

Gnomad4 OTH exome AF: 0.000170

GnomAD4 genome AF: 0.000138 AC: 21 AN: 152158 Hom.: 0 Cov.: 32 AF XY: 0.000108 AC XY: 8 AN XY: 74406

Gnomad4 AFR AF: 0.0000482

Gnomad4 AMR AF: 0.000327

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.000193

Gnomad4 SAS AF: 0.000415

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000147

Gnomad4 OTH AF: 0.000473

Alfa AF: 0.000149 Hom.: 0

Bravo AF: 0.000113

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000117 AC: 1

ExAC AF: 0.0000758 AC: 9

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genomic Diagnostic Laboratory, Division of Genomic Diagnostics, Children's Hospital of Philadelphia

Sep 18, 2015

- -

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

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 11, 2024

This sequence change replaces proline, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 254 of the DOK7 protein (p.Pro254Leu). This variant is present in population databases (rs200407250, gnomAD 0.04%). This variant has not been reported in the literature in individuals affected with DOK7-related conditions. ClinVar contains an entry for this variant (Variation ID: 252795). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt DOK7 protein function with a negative predictive value of 80%. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Revvity Omics, Revvity

Feb 03, 2020

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.071
BayesDel_addAF	Benign	-0.36	T
BayesDel_noAF	Benign	-0.45
CADD	Benign	16
DANN	Benign	0.87
DEOGEN2	Benign	0.34	T;.
Eigen	Benign	-0.51
Eigen_PC	Benign	-0.52
FATHMM_MKL	Benign	0.042	N
LIST_S2	Uncertain	0.88	D;D
M_CAP	Uncertain	0.13	D
MetaRNN	Benign	0.056	T;T
MetaSVM	Benign	-0.89	T
PrimateAI	Uncertain	0.65	T
PROVEAN	Uncertain	-3.7	D;.
REVEL	Benign	0.12
Sift	Benign	0.15	T;.
Sift4G	Benign	0.099	T;.
Polyphen		0.012	B;.
Vest4		0.25
MVP		0.75
MPC		0.012
ClinPred		0.045	T
GERP RS		3.5
Varity_R		0.067
gMVP		0.27

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs200407250; hg19: chr4-3491512;