chr9-214990-C-G

Variant names:

• chr9-214990-C-G
• rs1018736787
• NM_203447.4:c.14C>G

Variant summary

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

The NM_203447.4(DOCK8):​c.14C>G​(p.Pro5Arg) variant causes a missense change. The variant allele was found at a frequency of 0.0000076 in 1,446,806 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 0.0000076 (0 hom.)
• Consequence: DOCK8 NM_203447.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.82

Genes affected

DOCK8 (HGNC:19191): (dedicator of cytokinesis 8) This gene encodes a member of the DOCK180 family of guanine nucleotide exchange factors. Guanine nucleotide exchange factors interact with Rho GTPases and are components of intracellular signaling networks. Mutations in this gene result in the autosomal recessive form of the hyper-IgE syndrome. Alternatively spliced transcript variants encoding different isoforms have been described.[provided by RefSeq, Jun 2010]

DOCK8-AS1 (HGNC:26436): (DOCK8 antisense RNA 1)

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
DOCK8	NM_203447.4	c.14C>G	p.Pro5Arg	missense_variant	Exon 1 of 48	ENST00000432829.7	NP_982272.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DOCK8	ENST00000432829.7	c.14C>G	p.Pro5Arg	missense_variant	Exon 1 of 48	1	NM_203447.4	ENSP00000394888.3

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome AF: 0.00000760 AC: 11 AN: 1446806 Hom.: 0 Cov.: 110 AF XY: 0.00000556 AC XY: 4 AN XY: 719582

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: 0.0000118

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000902

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 34

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Combined immunodeficiency due to DOCK8 deficiency Uncertain:1

Apr 19, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces proline, which is neutral and non-polar, with arginine, which is basic and polar, at codon 5 of the DOCK8 protein (p.Pro5Arg). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with DOCK8-related conditions. 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. 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	Uncertain	0.49
BayesDel_addAF	Benign	-0.034	T
BayesDel_noAF	Benign	-0.43
CADD	Uncertain	24
DANN	Benign	0.89
DEOGEN2	Benign	0.12	T
Eigen	Benign	-0.070
Eigen_PC	Benign	-0.19
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Benign	0.79	T
M_CAP	Uncertain	0.16	D
MetaRNN	Uncertain	0.47	T
MetaSVM	Benign	-0.98	T
PrimateAI	Pathogenic	0.79	T
Sift4G	Benign	0.20	T
Polyphen		0.051	B
Vest4		0.67
MutPred		0.36		Gain of MoRF binding (P = 0);
MVP		0.60
ClinPred		0.51	D
GERP RS		4.0
Varity_R		0.10
gMVP		0.44

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: rs1018736787; hg19: chr9-214990;