rs778858648

Positions:

chr4-15599632-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2PP3PP5

The NM_001378615.1(CC2D2A):c.4600T>G(p.Leu1534Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000124 in 1,613,480 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

CC2D2A
NM_001378615.1 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1U:1

Conservation

PhyloP100: 0.429

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:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.816

PP5

Variant 4-15599632-T-G is Pathogenic according to our data. Variant chr4-15599632-T-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 217614.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=1, Pathogenic=1}. Variant chr4-15599632-T-G is described in Lovd as [Pathogenic]. Variant chr4-15599632-T-G is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
CC2D2A	NM_001378615.1 linkuse as main transcript	c.4600T>G	p.Leu1534Val	missense_variant	36/37	ENST00000424120.6	NP_001365544.1
CC2D2A	NM_001080522.2 linkuse as main transcript	c.4600T>G	p.Leu1534Val	missense_variant	37/38		NP_001073991.2
CC2D2A	NM_001378617.1 linkuse as main transcript	c.4453T>G	p.Leu1485Val	missense_variant	34/35		NP_001365546.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CC2D2A	ENST00000424120.6 linkuse as main transcript	c.4600T>G	p.Leu1534Val	missense_variant	36/37	5	NM_001378615.1	ENSP00000403465	P1	Q9P2K1-4

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152122

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000803

AC:

AN:

248932

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135062

show subpopulations

Gnomad AFR exome

AF:

0.000129

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461358

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

726956

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152122

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74320

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000756

ExAC

AF:

0.00000827

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1Uncertain:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Joubert syndrome 9

Pathogenic:1

Pathogenic, criteria provided, single submitter

research

UW Hindbrain Malformation Research Program, University of Washington

Feb 23, 2015

- -

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

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 20, 2021

This sequence change replaces leucine with valine at codon 1534 of the CC2D2A protein (p.Leu1534Val). The leucine residue is highly conserved and there is a small physicochemical difference between leucine and valine. This variant is present in population databases (rs778858648, ExAC 0.01%). This missense change has been observed in individuals with Joubert syndrome (PMID: 26092869). ClinVar contains an entry for this variant (Variation ID: 217614). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.35

BayesDel_addAF

Benign

-0.053

BayesDel_noAF

Uncertain

-0.080

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.69

D;D

Eigen

Benign

-0.25

Eigen_PC

Benign

-0.50

FATHMM_MKL

Benign

0.57

LIST_S2

Uncertain

0.93

D;.

M_CAP

Uncertain

0.12

MetaRNN

Pathogenic

0.82

D;D

MetaSVM

Uncertain

0.083

MutationAssessor

Pathogenic

3.1

M;M

MutationTaster

Benign

1.0

D;D;D;D

PrimateAI

Uncertain

0.49

PROVEAN

Benign

-2.3

N;N

REVEL

Uncertain

0.43

Sift

Pathogenic

0.0

D;D

Sift4G

Uncertain

0.0040

D;D

Polyphen

1.0

D;D

Vest4

0.93

MutPred

0.40

Gain of glycosylation at S1537 (P = 0.0328);Gain of glycosylation at S1537 (P = 0.0328);

MVP

0.72

MPC

0.29

ClinPred

0.81

GERP RS

-3.4

Varity_R

0.45

gMVP

0.68

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