X-111312782-A-G

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_001195553.2(DCX):c.947-46T>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0205 in 1,133,172 control chromosomes in the GnomAD database, including 240 homozygotes. There are 6,864 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.013 (20 hom., 389 hem., cov: 23)
  • Exomes 𝑓: 0.021 (220 hom. 6475 hem.)
• Consequence: DCX NM_001195553.2 intron
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:3
• Conservation: PhyloP100: 1.07

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 Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.55).
• BP6: Variant X-111312782-A-G is Benign according to our data. Variant chrX-111312782-A-G is described in ClinVar as [Likely_benign]. Clinvar id is 262927.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.0133 (1489/111976) while in subpopulation NFE AF= 0.0211 (1122/53187). AF 95% confidence interval is 0.0201. There are 20 homozygotes in gnomad4. There are 389 alleles in male gnomad4 subpopulation. Median coverage is 23. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd at 20 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DCX	NM_001195553.2	c.947-46T>C		intron_variant		ENST00000636035.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DCX	ENST00000636035.2	c.947-46T>C		intron_variant		2	NM_001195553.2	A1

Frequencies

GnomAD3 genomes AF: 0.0133 AC: 1488 AN: 111924 Hom.: 20 Cov.: 23 AF XY: 0.0114 AC XY: 389 AN XY: 34088

Gnomad AFR AF: 0.00316

Gnomad AMI AF: 0.0147

Gnomad AMR AF: 0.00975

Gnomad ASJ AF: 0.0162

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00677

Gnomad FIN AF: 0.0124

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0211

Gnomad OTH AF: 0.0133

GnomAD3 exomes AF: 0.0137 AC: 2393 AN: 174853 Hom.: 18 AF XY: 0.0134 AC XY: 808 AN XY: 60271

Gnomad AFR exome AF: 0.00283

Gnomad AMR exome AF: 0.00523

Gnomad ASJ exome AF: 0.0176

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00760

Gnomad FIN exome AF: 0.0129

Gnomad NFE exome AF: 0.0221

Gnomad OTH exome AF: 0.0122

GnomAD4 exome AF: 0.0213 AC: 21758 AN: 1021196 Hom.: 220 Cov.: 22 AF XY: 0.0217 AC XY: 6475 AN XY: 298512

Gnomad4 AFR exome AF: 0.00269

Gnomad4 AMR exome AF: 0.00563

Gnomad4 ASJ exome AF: 0.0188

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00730

Gnomad4 FIN exome AF: 0.0139

Gnomad4 NFE exome AF: 0.0250

Gnomad4 OTH exome AF: 0.0187

GnomAD4 genome AF: 0.0133 AC: 1489 AN: 111976 Hom.: 20 Cov.: 23 AF XY: 0.0114 AC XY: 389 AN XY: 34150

Gnomad4 AFR AF: 0.00315

Gnomad4 AMR AF: 0.00974

Gnomad4 ASJ AF: 0.0162

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00679

Gnomad4 FIN AF: 0.0124

Gnomad4 NFE AF: 0.0211

Gnomad4 OTH AF: 0.0131

Alfa AF: 0.0169 Hom.: 141

Bravo AF: 0.0128

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:2

Benign, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Feb 10, 2017	- -
Likely benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	-	- -

not provided Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Jun 19, 2018

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.55
Cadd	Benign	18
Dann	Benign	0.74

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs113181679; hg19: chrX-110556010;