rs778205727

Positions:

chr4-15540950-G-A

Variant summary

Our verdict is Benign. Variant got -9 ACMG points: 0P and 9B. BP4_StrongBP6BS2

The NM_001378615.1(CC2D2A):c.2117G>A(p.Arg706Gln) variant causes a missense change. The variant allele was found at a frequency of 0.000075 in 1,559,880 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000092 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000073 ( 2 hom. )

Consequence

CC2D2A
NM_001378615.1 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:3

Conservation

PhyloP100: 5.47

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 links:

CC2D2A (HGNC:):

CC2D2A links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.022001147).

BP6

Variant 4-15540950-G-A is Benign according to our data. Variant chr4-15540950-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 290432.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=3, Benign=1}.

BS2

High Homozygotes in GnomAdExome4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CC2D2A	NM_001378615.1 linkuse as main transcript	c.2117G>A	p.Arg706Gln	missense_variant	17/37	ENST00000424120.6	NP_001365544.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CC2D2A	ENST00000424120.6 linkuse as main transcript	c.2117G>A	p.Arg706Gln	missense_variant	17/37	5	NM_001378615.1	ENSP00000403465.1		Q9P2K1-4

Frequencies

GnomAD3 genomes

AF:

0.0000920

AC:

AN:

152136

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000262

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000754

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000370

AC:

AN:

167502

Hom.:

AF XY:

0.000283

AC XY:

AN XY:

88446

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00199

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000858

Gnomad SAS exome

AF:

0.0000434

Gnomad FIN exome

AF:

0.000460

Gnomad NFE exome

AF:

0.0000147

Gnomad OTH exome

AF:

0.000217

GnomAD4 exome

AF:

0.0000732

AC:

103

AN:

1407744

Hom.:

Cov.:

AF XY:

0.0000604

AC XY:

AN XY:

695098

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00162

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000274

Gnomad4 SAS exome

AF:

0.0000126

Gnomad4 FIN exome

AF:

0.000578

Gnomad4 NFE exome

AF:

0.00000646

Gnomad4 OTH exome

AF:

0.000103

GnomAD4 genome

AF:

0.0000920

AC:

AN:

152136

Hom.:

Cov.:

AF XY:

0.000135

AC XY:

AN XY:

74316

show subpopulations

Gnomad4 AFR

AF:

0.0000483

Gnomad4 AMR

AF:

0.000262

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.000754

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000301

Hom.:

Bravo

AF:

0.000212

ExAC

AF:

0.000199

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:3

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Jul 16, 2018	- -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Mar 16, 2017	A variant of uncertain significance has been identified in the CC2D2A gene. The R706Q variant has not been published as a pathogenic variant, nor has it been reported as a benign variant to our knowledge. The R706Q variant is not observed at a significant frequency in large population cohorts (Lek et al., 2016; 1000 Genomes Consortium et al., 2015; Exome Variant Server). The R706Q variant is a semi-conservative amino acid substitution, which may impact secondary protein structure as these residues differ in some properties. However, this substitution occurs at a position that is not conserved. In silico analysis is inconsistent in its predictions as to whether or not the variant is damaging to the protein structure/function. Therefore, based on the currently available information, it is unclear whether this variant is a pathogenic variant or a rare benign variant. -

Meckel syndrome, type 6

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

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. -

Meckel-Gruber syndrome;C0431399:Familial aplasia of the vermis

Benign:1

Benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 09, 2024

- -

Joubert syndrome 9

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

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 and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

CC2D2A-related disorder

Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Mar 15, 2022

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.11

BayesDel_addAF

Benign

-0.43

BayesDel_noAF

Benign

-0.40

CADD

Uncertain

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.13

T;T

Eigen

Uncertain

0.36

Eigen_PC

Uncertain

0.41

FATHMM_MKL

Uncertain

0.87

LIST_S2

Uncertain

0.92

D;.

M_CAP

Benign

0.017

MetaRNN

Benign

0.022

T;T

MetaSVM

Benign

-0.95

MutationAssessor

Uncertain

2.4

M;M

PrimateAI

Uncertain

0.58

PROVEAN

Benign

-1.6

N;N

REVEL

Benign

0.12

Sift

Benign

0.068

T;T

Sift4G

Uncertain

0.013

D;D

Polyphen

0.77

P;P

Vest4

0.45

MutPred

0.41

Loss of methylation at R706 (P = 0.0662);Loss of methylation at R706 (P = 0.0662);

MVP

0.61

MPC

0.092

ClinPred

0.081

GERP RS

4.1

Varity_R

0.16

gMVP

0.48

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

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over