rs1234078639

Positions:

• chr5-169681839-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_004946.3(DOCK2):​c.566A>G​(p.Glu189Gly) variant causes a missense change. 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 Uncertain significance (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: DOCK2 NM_004946.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.97

Genes affected

DOCK2 (HGNC:2988): (dedicator of cytokinesis 2) The protein encoded by this gene belongs to the CDM protein family. It is specifically expressed in hematopoietic cells and is predominantly expressed in peripheral blood leukocytes. The protein is involved in remodeling of the actin cytoskeleton required for lymphocyte migration in response to chemokine signaling. It activates members of the Rho family of GTPases, for example RAC1 and RAC2, by acting as a guanine nucleotide exchange factor (GEF) to exchange bound GDP for free GTP. Mutations in this gene result in immunodeficiency 40 (IMD40), a combined form of immunodeficiency that affects T cell number and function, also with variable defects in B cell and NK cell function. [provided by RefSeq, May 2018]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, DOCK2
• BP4: Computational evidence support a benign effect (MetaRNN=0.21835583).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DOCK2	NM_004946.3	c.566A>G	p.Glu189Gly	missense_variant	7/52	ENST00000520908.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DOCK2	ENST00000520908.7	c.566A>G	p.Glu189Gly	missense_variant	7/52	2	NM_004946.3	P1
DOCK2	ENST00000524185.5	c.566A>G	p.Glu189Gly	missense_variant, NMD_transcript_variant	7/53	1
DOCK2	ENST00000519628.2	c.566A>G	p.Glu189Gly	missense_variant	7/28	3
DOCK2	ENST00000522138.2	c.*76A>G		3_prime_UTR_variant, NMD_transcript_variant	7/52	3

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 31

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

DOCK2 deficiency Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jun 02, 2017

In summary, this variant has uncertain impact on DOCK2 function. The available evidence is currently insufficient to determine its role in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with a DOCK2-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces glutamic acid with glycine at codon 189 of the DOCK2 protein (p.Glu189Gly). The glutamic acid residue is moderately conserved and there is a moderate physicochemical difference between glutamic acid and glycine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.14
BayesDel_addAF	Pathogenic	0.17	D
BayesDel_noAF	Uncertain	0.010
CADD	Benign	23
DANN	Uncertain	0.99
DEOGEN2	Benign	0.15	T;T
Eigen	Benign	0.045
Eigen_PC	Benign	0.14
FATHMM_MKL	Uncertain	0.93	D
M_CAP	Benign	0.016	T
MetaRNN	Benign	0.22	T;T
MetaSVM	Benign	-0.99	T
MutationAssessor	Benign	1.8	L;L
MutationTaster	Benign	0.63	N
PrimateAI	Uncertain	0.53	T
PROVEAN	Uncertain	-2.9	D;D
REVEL	Benign	0.24
Sift	Benign	0.38	T;D
Sift4G	Benign	0.34	T;.
Polyphen		0.46	P;P
Vest4		0.46
MutPred		0.33		Gain of catalytic residue at A190 (P = 0.0523);Gain of catalytic residue at A190 (P = 0.0523);
MVP		0.90
MPC		0.65
ClinPred		0.80	D
GERP RS		4.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.22
gMVP		0.71

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

LitVar

Other links and lift over

dbSNP: rs1234078639; hg19: chr5-169108843;