rs1556405129

Variant names:

• chrX-111410209-A-C
• rs1556405129
• NM_001195553.2:c.190T>G

Your query was ambiguous. Multiple possible variants found:

• chrX-111410209-A-C
• chrX-111410209-A-T

Variant summary

Our verdict is Pathogenic. The variant received 13 ACMG points: 13P and 0B. PM1 PM2 PM5 PP2 PP3_Strong PP5_Moderate

The NM_001195553.2(DCX):​c.190T>G​(p.Tyr64Asp) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. Y64N) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 22)
• Consequence: DCX NM_001195553.2 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 9.32
• 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: Pathogenic. The variant received 13 ACMG points.

• PM1: In a hotspot region, there are 13 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 0 uncertain in NM_001195553.2
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chrX-111410209-A-T is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 438585.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 87 curated pathogenic missense variants (we use a threshold of 10). The gene has 3 curated benign missense variants. Trascript score misZ: NaN (below the threshold of 3.09). GenCC associations: The gene is linked to lissencephaly type 1 due to doublecortin gene mutation, lissencephaly spectrum disorders, subcortical band heterotopia.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.947
• PP5: Variant X-111410209-A-C is Pathogenic according to our data. Variant chrX-111410209-A-C is described in ClinVar as Pathogenic. ClinVar VariationId is 2811793.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DCX	NM_001195553.2	c.190T>G	p.Tyr64Asp	missense_variant	Exon 2 of 7	ENST00000636035.2	NP_001182482.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DCX	ENST00000636035.2	c.190T>G	p.Tyr64Asp	missense_variant	Exon 2 of 7	2	NM_001195553.2	ENSP00000490614.1
DCX	ENST00000356220.8	c.190T>G	p.Tyr64Asp	missense_variant	Exon 3 of 8	5		ENSP00000348553.4
DCX	ENST00000637453.1	c.190T>G	p.Tyr64Asp	missense_variant	Exon 2 of 7	5		ENSP00000490357.1
DCX	ENST00000637570.1	c.190T>G	p.Tyr64Asp	missense_variant	Exon 2 of 7	5		ENSP00000490878.1

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 22

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1

Apr 03, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. This variant disrupts the p.Tyr64 amino acid residue in DCX. Other variant(s) that disrupt this residue have been observed in individuals with DCX-related conditions (PMID: 18685874, 29706646; Invitae), which suggests that this may be a clinically significant amino acid residue. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt DCX protein function. This missense change has been observed in individual(s) with lissencephaly (Invitae). In at least one individual the variant was observed to be de novo. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces tyrosine, which is neutral and polar, with aspartic acid, which is acidic and polar, at codon 64 of the DCX protein (p.Tyr64Asp). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.65	D
BayesDel_noAF	Pathogenic	0.70
CADD	Pathogenic	27
DANN	Uncertain	0.99
DEOGEN2	Benign	0.19	.;T;.;.;T;T;.;T;.;T;D
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.98	.;.;.;D;D;.;.;D;D;D;D
M_CAP	Pathogenic	0.91	D
MetaRNN	Pathogenic	0.95	D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	1.0	D
PhyloP100		9.3
PrimateAI	Pathogenic	0.93	D
PROVEAN	Pathogenic	-7.3	.;.;.;D;.;D;D;.;.;.;D
REVEL	Pathogenic	0.94
Sift	Uncertain	0.0030	.;.;.;D;.;D;D;.;.;.;D
Sift4G	Pathogenic	0.0	.;.;.;D;.;D;D;.;.;.;D
Vest4		0.75, 0.73, 0.72
MVP		1.0
ClinPred		1.0	D
GERP RS		5.4
PromoterAI		0.028	Neutral
Varity_R		0.98
gMVP		0.97
Mutation Taster		=2/98	disease causing

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: rs1556405129; hg19: chrX-110653437;