Genetic Variant DCDC2:p.Asp348Glu (chr6-24178612-G-T) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_016356.5(DCDC2):c.1044C>A(p.Asp348Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,460,914 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. D348D) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

DCDC2
NM_016356.5 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.237

Publications

2 publications found

Variant links:

Genes affected

DCDC2 (HGNC:18141): (doublecortin domain containing 2) This gene encodes a doublecortin domain-containing family member. The doublecortin domain has been demonstrated to bind tubulin and enhance microtubule polymerization. This family member is thought to function in neuronal migration where it may affect the signaling of primary cilia. Mutations in this gene have been associated with reading disability (RD) type 2, also referred to as developmental dyslexia. Alternatively spliced transcript variants encoding the same protein have been found for this gene. [provided by RefSeq, Jan 2013]

DCDC2 Gene-Disease associations (from GenCC):

ciliopathy
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen, Ambry Genetics
isolated neonatal sclerosing cholangitis
Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet
nephronophthisis 19
Inheritance: AR Classification: STRONG Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
hearing loss, autosomal recessive
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
Senior-Boichis syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
nonsyndromic genetic hearing loss
Inheritance: AR Classification: LIMITED Submitted by: ClinGen
autosomal recessive nonsyndromic hearing loss 66
Inheritance: Unknown, AR Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae), PanelApp Australia, Ambry Genetics

DCDC2 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.24767107).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DCDC2	NM_016356.5 link	c.1044C>A	p.Asp348Glu	missense_variant	Exon 9 of 10	ENST00000378454.8	NP_057440.2
DCDC2	NM_001195610.2 link	c.1044C>A	p.Asp348Glu	missense_variant	Exon 10 of 11		NP_001182539.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DCDC2	ENST00000378454.8 link	c.1044C>A	p.Asp348Glu	missense_variant	Exon 9 of 10	1	NM_016356.5	ENSP00000367715.3		Q9UHG0-1
DCDC2	ENST00000378450.6 link	c.303C>A	p.Asp101Glu	missense_variant	Exon 2 of 3	1		ENSP00000367711.3		Q9UHG0-2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000399

AC:

AN:

250470

AF XY:

0.00000739

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000882

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

6.85e-7

AC:

AN:

1460914

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726758

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33456

American (AMR)

AF:

0.00

AC:

AN:

44696

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26066

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86200

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52880

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1111766

Other (OTH)

AF:

0.00

AC:

AN:

60382

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.575

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.097

BayesDel_addAF

Benign

-0.19

BayesDel_noAF

Benign

-0.51

CADD

Benign

6.9

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.027

.;T

Eigen

Benign

-0.35

Eigen_PC

Benign

-0.38

FATHMM_MKL

Benign

0.50

LIST_S2

Benign

0.63

T;T

M_CAP

Benign

0.0062

MetaRNN

Benign

0.25

T;T

MetaSVM

Benign

-1.0

MutationAssessor

Uncertain

2.0

.;M

PhyloP100

0.24

PrimateAI

Uncertain

0.53

PROVEAN

Benign

0.43

N;N

REVEL

Benign

0.11

Sift

Benign

0.24

T;T

Sift4G

Benign

0.26

T;T

Polyphen

1.0

D;D

Vest4

0.40

MutPred

0.16

.;Loss of loop (P = 0.0804);

MVP

0.61

MPC

0.11

ClinPred

0.22

GERP RS

0.083

Varity_R

0.036

gMVP

0.051

Mutation Taster

=92/8

polymorphism

(source)

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over