X-111301701-C-G

Variant names:

• chrX-111301701-C-G
• rs1064795284
• NM_001195553.2:c.1087G>C

Variant summary

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

The NM_001195553.2(DCX):​c.1087G>C​(p.Gly363Arg) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 22)
• Consequence: DCX NM_001195553.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.36

Genes affected

DCX (HGNC:2714): (doublecortin) This gene encodes a member of the doublecortin family. The protein encoded by this gene is a cytoplasmic protein and contains two doublecortin domains, which bind microtubules. In the developing cortex, cortical neurons must migrate over long distances to reach the site of their final differentiation. The encoded protein appears to direct neuronal migration by regulating the organization and stability of microtubules. In addition, the encoded protein interacts with LIS1, the regulatory gamma subunit of platelet activating factor acetylhydrolase, and this interaction is important to proper microtubule function in the developing cortex. Mutations in this gene cause abnormal migration of neurons during development and disrupt the layering of the cortex, leading to epilepsy, cognitive disability, subcortical band heterotopia ("double cortex" syndrome) in females and lissencephaly ("smooth brain" syndrome) in males. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Sep 2010]

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
DCX	NM_001195553.2	c.1087G>C	p.Gly363Arg	missense_variant	Exon 7 of 7	ENST00000636035.2	NP_001182482.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DCX	ENST00000636035.2	c.1087G>C	p.Gly363Arg	missense_variant	Exon 7 of 7	2	NM_001195553.2	ENSP00000490614.1
DCX	ENST00000356220.8	c.1087G>C	p.Gly363Arg	missense_variant	Exon 8 of 8	5		ENSP00000348553.4
DCX	ENST00000637453.1	c.1087G>C	p.Gly363Arg	missense_variant	Exon 7 of 7	5		ENSP00000490357.1
DCX	ENST00000637570.1	c.1072G>C	p.Gly358Arg	missense_variant	Exon 7 of 7	5		ENSP00000490878.1

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 22

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Jul 25, 2016

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The G357R variant in the DCX gene has not been reported previously as a pathogenic variant, nor as a benign variant, to our knowledge. The G357R variant was not observed in approximately 6500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. The G357R variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a position that is conserved across species and in silico analysis predicts this variant is probably damaging to the protein structure/function. We interpret G357R as a variant of uncertain significance -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.83
BayesDel_addAF	Benign	-0.14	T
BayesDel_noAF	Benign	-0.44
CADD	Benign	23
DANN	Uncertain	0.99
DEOGEN2	Benign	0.067	.;T;.;.;T;T;.;T;.
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.93	.;.;.;D;D;.;.;D;D
M_CAP	Pathogenic	0.35	D
MetaRNN	Uncertain	0.51	D;D;D;D;D;D;D;D;D
MetaSVM	Benign	-1.0	T
PrimateAI	Pathogenic	0.87	D
PROVEAN	Uncertain	-2.8	.;.;.;D;.;.;D;.;.
REVEL	Benign	0.19
Sift	Pathogenic	0.0	.;.;.;D;.;.;D;.;.
Sift4G	Pathogenic	0.0	.;.;.;D;.;.;D;.;.
Vest4		0.65, 0.66
MVP		0.53
ClinPred		0.95	D
GERP RS		4.9
Varity_R		0.71
gMVP		0.47

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: rs1064795284; hg19: chrX-110544929;