NM_001378615.1:c.1946C>T

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BP4_Strong

The NM_001378615.1(CC2D2A):c.1946C>T(p.Thr649Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000125 in 1,605,808 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 17/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T649R) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00017 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00012 ( 1 hom. )

Consequence

CC2D2A
NM_001378615.1 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:6B:1

Conservation

PhyloP100: -0.933

Publications

1 publications found

Variant links:

Genes affected

CC2D2A (HGNC:29253): (coiled-coil and C2 domain containing 2A) This gene encodes a coiled-coil and calcium binding domain protein that appears to play a critical role in cilia formation. Mutations in this gene cause Meckel syndrome type 6, as well as Joubert syndrome type 9. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Sep 2009]

CC2D2A Gene-Disease associations (from GenCC):

ciliopathy
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
Joubert syndrome 9
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp, G2P
retinitis pigmentosa 93
Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
COACH syndrome 1
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
Joubert syndrome with oculorenal defect
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
Meckel syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

CC2D2A links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -4 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.010156244).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CC2D2A	NM_001378615.1 link	c.1946C>T	p.Thr649Met	missense_variant	Exon 16 of 37	ENST00000424120.6	NP_001365544.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CC2D2A	ENST00000424120.6 link	c.1946C>T	p.Thr649Met	missense_variant	Exon 16 of 37	5	NM_001378615.1	ENSP00000403465.1		Q9P2K1-4

Frequencies

GnomAD3 genomes

AF:

0.000171

AC:

AN:

152094

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000724

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000917

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000882

Gnomad OTH

AF:

0.00144

GnomAD2 exomes

AF:

0.000166

AC:

AN:

234634

AF XY:

0.000205

show subpopulations

Gnomad AFR exome

AF:

0.000142

Gnomad AMR exome

AF:

0.000513

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000754

Gnomad OTH exome

AF:

0.000350

GnomAD4 exome

AF:

0.000120

AC:

174

AN:

1453596

Hom.:

Cov.:

AF XY:

0.000147

AC XY:

106

AN XY:

722030

show subpopulations

African (AFR)

AF:

0.0000300

AC:

AN:

33364

American (AMR)

AF:

0.000710

AC:

AN:

43650

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25874

East Asian (EAS)

AF:

0.00

AC:

AN:

39386

South Asian (SAS)

AF:

0.000249

AC:

AN:

84336

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52926

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5756

European-Non Finnish (NFE)

AF:

0.0000957

AC:

106

AN:

1108188

Other (OTH)

AF:

0.000250

AC:

AN:

60116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.500

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000171

AC:

AN:

152212

Hom.:

Cov.:

AF XY:

0.000228

AC XY:

AN XY:

74418

show subpopulations

African (AFR)

AF:

0.0000722

AC:

AN:

41548

American (AMR)

AF:

0.000916

AC:

AN:

15292

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5164

South Asian (SAS)

AF:

0.00

AC:

AN:

4814

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10588

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000882

AC:

AN:

68016

Other (OTH)

AF:

0.00142

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.471

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000158

Hom.:

Bravo

AF:

0.000355

ExAC

AF:

0.0000990

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:6Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Mar 16, 2023

Mayo Clinic Laboratories, Mayo Clinic

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

BP4, PM2 -

May 17, 2018

Eurofins Ntd Llc (ga)

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Joubert syndrome 9;C2676790:Meckel syndrome, type 6;C5435651:COACH syndrome 1

Uncertain:1

Oct 31, 2018

Fulgent Genetics, Fulgent Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Meckel syndrome, type 6

Uncertain:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

CC2D2A-related disorder

Uncertain:1

Jul 02, 2024

PreventionGenetics, part of Exact Sciences

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:clinical testing

The CC2D2A c.1946C>T variant is predicted to result in the amino acid substitution p.Thr649Met. To our knowledge, this variant has not been reported in the literature. This variant is reported in 0.050% of alleles in individuals of Latino descent in gnomAD, which may be too common to be an unreported primary cause of disease. Though we suspect this variant may be benign, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Joubert syndrome 9

Uncertain:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Meckel-Gruber syndrome;C0431399:Joubert syndrome

Benign:1

Jan 13, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.068

BayesDel_addAF

Benign

-0.45

BayesDel_noAF

Benign

-0.53

CADD

Benign

0.16

(source)

DANN

Benign

0.93

DEOGEN2

Benign

0.17

T;T

Eigen

Benign

-1.4

Eigen_PC

Benign

-1.5

FATHMM_MKL

Benign

0.0097

LIST_S2

Benign

0.81

T;.

M_CAP

Benign

0.024

MetaRNN

Benign

0.010

T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

0.0

N;N

PhyloP100

-0.93

PrimateAI

Benign

0.22

PROVEAN

Benign

-0.40

N;N

REVEL

Benign

0.091

Sift

Benign

0.11

T;T

Sift4G

Benign

0.079

T;T

Polyphen

0.034

B;B

Vest4

0.077

MutPred

0.24

Gain of catalytic residue at T649 (P = 0.0037);Gain of catalytic residue at T649 (P = 0.0037);

MVP

0.12

MPC

0.045

ClinPred

0.020

GERP RS

-8.9

Varity_R

0.023

gMVP

0.28

Mutation Taster

=100/0

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.050

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

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over