chrX-111400995-T-TTCCATCCAGAGTGTA

Variant names:

• chrX-111400995-T-TTCCATCCAGAGTGTA
• rs797045518
• NM_001195553.2:c.685_699dupTACACTCTGGATGGA

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM1 PM4 PP5_Moderate

The NM_001195553.2(DCX):​c.685_699dupTACACTCTGGATGGA​(p.Gly233_Lys234insTyrThrLeuAspGly) variant causes a conservative inframe insertion change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type INS_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 23)
• Consequence: DCX NM_001195553.2 conservative_inframe_insertion
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 0.538
• 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: Orphanet, Labcorp Genetics (formerly Invitae), G2P
• subcortical band heterotopia

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 3 uncertain in NM_001195553.2
• PM4: Nonframeshift variant in NON repetitive region in NM_001195553.2.
• PP5: Variant X-111400995-T-TTCCATCCAGAGTGTA is Pathogenic according to our data. Variant chrX-111400995-T-TTCCATCCAGAGTGTA is described in ClinVar as Pathogenic. ClinVar VariationId is 210834.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

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DCX	NM_001195553.2	MANE Select	c.685_699dupTACACTCTGGATGGA	p.Gly233_Lys234insTyrThrLeuAspGly	conservative_inframe_insertion	Exon 3 of 7	NP_001182482.1
	DCX	NM_000555.3		c.928_942dupTACACTCTGGATGGA	p.Gly314_Lys315insTyrThrLeuAspGly	conservative_inframe_insertion	Exon 3 of 7	NP_000546.2
	DCX	NM_001369370.1		c.685_699dupTACACTCTGGATGGA	p.Gly233_Lys234insTyrThrLeuAspGly	conservative_inframe_insertion	Exon 3 of 7	NP_001356299.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DCX	ENST00000636035.2	TSL:2 MANE Select	c.685_699dupTACACTCTGGATGGA	p.Gly233_Lys234insTyrThrLeuAspGly	conservative_inframe_insertion	Exon 3 of 7	ENSP00000490614.1
	DCX	ENST00000358070.10	TSL:1	c.865_879dupTACACTCTGGATGGA	p.Gly293_Lys294insTyrThrLeuAspGly	conservative_inframe_insertion	Exon 3 of 7	ENSP00000350776.6
	DCX	ENST00000356220.8	TSL:5	c.685_699dupTACACTCTGGATGGA	p.Gly233_Lys234insTyrThrLeuAspGly	conservative_inframe_insertion	Exon 4 of 8	ENSP00000348553.4

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 23

ClinVar

ClinVar submissions as Germline

Significance: Pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	Abnormal cortical gyration (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		0.54
Mutation Taster		=45/55	disease causing (ClinVar)

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs797045518; hg19: chrX-110644223;