NM_001195553.2:c.176G>T

Variant names:

• chrX-111410223-C-A
• rs122457137
• NM_001195553.2:c.176G>T

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PM1 PM2 PM5 PP2 PP3_Moderate PP5

The NM_001195553.2(DCX):​c.176G>T​(p.Arg59Leu) 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 (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R59H) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 22)
• Consequence: DCX NM_001195553.2 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:2
• Conservation: PhyloP100: 7.91
• Publications: 10 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 10 ACMG points.

• PM1: In a hotspot region, there are 12 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 3 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-111410223-C-T is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 158433.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 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, 0.93
• PP5: Variant X-111410223-C-A is Pathogenic according to our data. Variant chrX-111410223-C-A is described in ClinVar as Pathogenic. ClinVar VariationId is 11601.Status of the report is no_assertion_criteria_provided, 0 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.176G>T	p.Arg59Leu	missense	Exon 2 of 7	NP_001182482.1
	DCX	NM_000555.3		c.419G>T	p.Arg140Leu	missense	Exon 2 of 7	NP_000546.2
	DCX	NM_001369370.1		c.176G>T	p.Arg59Leu	missense	Exon 2 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.176G>T	p.Arg59Leu	missense	Exon 2 of 7	ENSP00000490614.1
	DCX	ENST00000358070.10	TSL:1	c.356G>T	p.Arg119Leu	missense	Exon 2 of 7	ENSP00000350776.6
	DCX	ENST00000356220.8	TSL:5	c.176G>T	p.Arg59Leu	missense	Exon 3 of 8	ENSP00000348553.4

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 22

Alfa AF: 0.00 Hom.: 0

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: no assertion criteria provided

Submissions by phenotype

Lissencephaly type 1 due to doublecortin gene mutation Pathogenic:1

Jan 09, 1998

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

Subcortical laminar heterotopia, X-linked Pathogenic:1

Jan 09, 1998

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.67	D
BayesDel_noAF	Pathogenic	0.72
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Benign	0.27	T
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.92	D
M_CAP	Pathogenic	0.74	D
MetaRNN	Pathogenic	0.93	D
MetaSVM	Pathogenic	1.1	D
PhyloP100		7.9
PrimateAI	Pathogenic	0.90	D
PROVEAN	Pathogenic	-5.7	D
REVEL	Pathogenic	0.92
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.0020	D
Vest4		0.96
MVP		1.0
ClinPred		1.0	D
GERP RS		5.4
PromoterAI		-0.060	Neutral
Varity_R		0.96
gMVP		0.99
Mutation Taster		=0/100	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs122457137; hg19: chrX-110653451;