rs797045516

Variant names:

• chrX-111401116-CT-C
• rs797045516
• NM_001195553.2:c.578delA

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 10P and 2B. PVS1 PM2 BP6_Moderate

The NM_001195553.2(DCX):​c.578delA​(p.Lys193ArgfsTer7) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Benign (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 23)
• Consequence: DCX NM_001195553.2 frameshift
• Clinical Significance: Benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 8.02
• Publications: 0 publications found

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]

DCX Gene-Disease associations (from GenCC):

• lissencephaly spectrum disorders

  Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen
• lissencephaly type 1 due to doublecortin gene mutation

  Inheritance: XL Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Orphanet, Labcorp Genetics (formerly Invitae)
• subcortical band heterotopia

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_pathogenic. The variant received 8 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• BP6: Variant X-111401116-CT-C is Benign according to our data. Variant chrX-111401116-CT-C is described in ClinVar as Benign. ClinVar VariationId is 210832.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001195553.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DCX	NM_001195553.2	MANE Select	c.578delA	p.Lys193ArgfsTer7	frameshift	Exon 3 of 7	NP_001182482.1	A8K340
	DCX	NM_000555.3		c.821delA	p.Lys274ArgfsTer7	frameshift	Exon 3 of 7	NP_000546.2	O43602
	DCX	NM_001369370.1		c.578delA	p.Lys193ArgfsTer7	frameshift	Exon 3 of 7	NP_001356299.1	A8K340

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DCX	ENST00000636035.2	TSL:2 MANE Select	c.578delA	p.Lys193ArgfsTer7	frameshift	Exon 3 of 7	ENSP00000490614.1	A8K340
	DCX	ENST00000358070.10	TSL:1	c.758delA	p.Lys253ArgfsTer7	frameshift	Exon 3 of 7	ENSP00000350776.6	A0A9S7JGE9
	DCX	ENST00000356220.8	TSL:5	c.578delA	p.Lys193ArgfsTer7	frameshift	Exon 4 of 8	ENSP00000348553.4	A8K340

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 23

ClinVar

ClinVar submissions

Significance: Benign

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	-	1	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		8.0

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

Other links and lift over

dbSNP: rs797045516; hg19: chrX-110644344;