1-62496465-C-T

Variant names:

• chr1-62496465-C-T
• rs1553156197
• NM_001367561.1:c.4797G>A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_001367561.1(DOCK7):​c.4797G>A​(p.Met1599Ile) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000137 in 1,461,050 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.000014 (0 hom.)
• Consequence: DOCK7 NM_001367561.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.90

Genes affected

DOCK7 (HGNC:19190): (dedicator of cytokinesis 7) The protein encoded by this gene is a guanine nucleotide exchange factor (GEF) that plays a role in axon formation and neuronal polarization. The encoded protein displays GEF activity toward RAC1 and RAC3 Rho small GTPases but not toward CDC42. Several transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Dec 2012]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DOCK7	NM_001367561.1	c.4797G>A	p.Met1599Ile	missense_variant	Exon 38 of 50	ENST00000635253.2	NP_001354490.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DOCK7	ENST00000635253.2	c.4797G>A	p.Met1599Ile	missense_variant	Exon 38 of 50	5	NM_001367561.1	ENSP00000489124.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.0000137 AC: 20 AN: 1461050 Hom.: 0 Cov.: 31 AF XY: 0.0000151 AC XY: 11 AN XY: 726830

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000171

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Developmental and epileptic encephalopathy, 23 Uncertain:1

Dec 05, 2017

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces methionine with isoleucine at codon 1590 of the DOCK7 protein (p.Met1590Ile). The methionine residue is highly conserved and there is a small physicochemical difference between methionine and isoleucine. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals with DOCK7-related disease. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.21	D
BayesDel_noAF	Uncertain	0.070
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Benign	0.11	.;.;.;T;.;.;T
Eigen	Uncertain	0.40
Eigen_PC	Uncertain	0.53
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.98	D;D;D;D;D;D;D
M_CAP	Benign	0.028	D
MetaRNN	Uncertain	0.60	D;D;D;D;D;D;D
MetaSVM	Benign	-0.88	T
MutationAssessor	Benign	1.2	.;.;.;.;.;.;L
PrimateAI	Pathogenic	0.83	D
PROVEAN	Uncertain	-3.9	D;.;D;.;.;.;.
REVEL	Uncertain	0.45
Sift	Uncertain	0.0040	D;.;T;.;.;.;.
Sift4G	Uncertain	0.0080	D;D;D;.;D;D;D
Polyphen		0.86	P;D;D;.;D;D;D
Vest4		0.74
MutPred		0.48		.;.;.;.;.;.;Loss of helix (P = 0.079);
MVP		0.76
MPC		1.2
ClinPred		0.97	D
GERP RS		5.8
Varity_R		0.50
gMVP		0.53

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs1553156197; hg19: chr1-62962136;