chrX-111301743-C-G

Variant names:

• chrX-111301743-C-G
• rs1556364322
• NM_001195553.2:c.1045G>C

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2 PP2

The NM_001195553.2(DCX):​c.1045G>C​(p.Asp349His) variant causes a missense, splice region change. The variant was absent in control chromosomes in GnomAD project. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 22)
• Consequence: DCX NM_001195553.2 missense, splice_region
• Scores: Splicing: ADA: 0.2347
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.36
• 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: Uncertain_significance. The variant received 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• 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.

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.1045G>C	p.Asp349His	missense splice_region	Exon 7 of 7	NP_001182482.1	A8K340
	DCX	NM_000555.3		c.1270G>C	p.Asp424His	missense splice_region	Exon 7 of 7	NP_000546.2	O43602
	DCX	NM_001369370.1		c.1045G>C	p.Asp349His	missense splice_region	Exon 7 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.1045G>C	p.Asp349His	missense splice_region	Exon 7 of 7	ENSP00000490614.1	A8K340
	DCX	ENST00000358070.10	TSL:1	c.1207G>C	p.Asp403His	missense splice_region	Exon 7 of 7	ENSP00000350776.6	A0A9S7JGE9
	DCX	ENST00000356220.8	TSL:5	c.1045G>C	p.Asp349His	missense splice_region	Exon 8 of 8	ENSP00000348553.4	A8K340

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 22

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

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

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.76
BayesDel_addAF	Pathogenic	0.21	D
BayesDel_noAF	Uncertain	0.060
CADD	Uncertain	25
DANN	Uncertain	0.98
DEOGEN2	Benign	0.030	T
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.88	D
M_CAP	Pathogenic	0.43	D
MetaRNN	Benign	0.35	T
MetaSVM	Benign	-0.80	T
PhyloP100		5.4
PrimateAI	Pathogenic	0.84	D
PROVEAN	Benign	-1.8	N
REVEL	Benign	0.25
Sift	Uncertain	0.011	D
Sift4G	Uncertain	0.046	D
Vest4		0.62
MVP		0.84
ClinPred		0.69	D
GERP RS		4.9
Varity_R		0.42
gMVP		0.26
Mutation Taster		=39/61	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.23
dbscSNV1_RF	Benign	0.54
SpliceAI score (max)		0.19		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: rs1556364322; hg19: chrX-110544971;