12-94308899-C-T

Variant names:

• chr12-94308899-C-T
• rs1969381470
• NM_016122.3:c.2020G>A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_016122.3(CEP83):​c.2020G>A​(p.Glu674Lys) variant causes a missense change. The variant allele was found at a frequency of 0.000000686 in 1,458,538 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: CEP83 NM_016122.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.45

Genes affected

CEP83 (HGNC:17966): (centrosomal protein 83) The protein encoded by this gene is a centriolar protein involved in primary cilium assembly. Defects in this gene have been associated with infantile nephronophthisis and intellectual disability. [provided by RefSeq, Oct 2016]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

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

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CEP83	NM_016122.3	c.2020G>A	p.Glu674Lys	missense_variant	Exon 17 of 17	ENST00000397809.10	NP_057206.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CEP83	ENST00000397809.10	c.2020G>A	p.Glu674Lys	missense_variant	Exon 17 of 17	1	NM_016122.3	ENSP00000380911.4
CEP83	ENST00000339839.9	c.2020G>A	p.Glu674Lys	missense_variant	Exon 16 of 16	1		ENSP00000344655.5
CEP83	ENST00000552632.5	c.412G>A	p.Glu138Lys	missense_variant	Exon 4 of 5	3		ENSP00000447094.1
CEP83	ENST00000546783.1	n.474G>A		non_coding_transcript_exon_variant	Exon 3 of 3	3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.86e-7 AC: 1 AN: 1458538 Hom.: 0 Cov.: 28 AF XY: 0.00 AC XY: 0 AN XY: 725758

Gnomad4 AFR exome AF: 0.00

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: 9.02e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Nephronophthisis 18 Uncertain:1

Mar 02, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces glutamic acid, which is acidic and polar, with lysine, which is basic and polar, at codon 674 of the CEP83 protein (p.Glu674Lys). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with CEP83-related conditions. ClinVar contains an entry for this variant (Variation ID: 954930). 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: "Not Available"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Not Available"). 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	Pathogenic	0.79
BayesDel_addAF	Pathogenic	0.28	D
BayesDel_noAF	Pathogenic	0.17
CADD	Pathogenic	29
DANN	Uncertain	1.0
Eigen	Pathogenic	0.69
Eigen_PC	Pathogenic	0.72
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Uncertain	0.92	D;.;D
M_CAP	Benign	0.060	D
MetaRNN	Uncertain	0.53	D;D;D
MetaSVM	Benign	-0.46	T
PrimateAI	Uncertain	0.73	T
PROVEAN	Benign	-2.0	N;N;N
REVEL	Benign	0.26
Sift	Uncertain	0.0060	D;D;D
Sift4G	Pathogenic	0.0	D;T;T
Vest4		0.56, 0.56
MVP		0.78
MPC		0.47
ClinPred		0.92	D
GERP RS		5.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.20
gMVP		0.56

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

Other links and lift over

dbSNP: rs1969381470; hg19: chr12-94702675;