rs587777501

Variant names:

• chr5-55231467-G-A
• rs587777501
• NM_021147.5:c.961C>T

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PVS1_Moderate PP5_Moderate

The NM_021147.5(CCNO):​c.961C>T​(p.Gln321*) variant causes a stop gained change. The variant allele was found at a frequency of 0.00000479 in 1,461,768 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 Likely pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000048 (0 hom.)
• Consequence: CCNO NM_021147.5 stop_gained
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 3.83
• Publications: 2 publications found

Genes affected

CCNO (HGNC:18576): (cyclin O) This gene encodes a member of the cyclin protein family, and the encoded protein is involved in regulation of the cell cycle. Disruption of this gene is associated with primary ciliary dyskinesia-19. Alternative splicing results in multiple transcript variants. This gene, which has a previous symbol of UNG2, was erroneously identified as a uracil DNA glycosylase in PubMed ID: 2001396. A later publication, PubMed ID: 8419333, identified this gene's product as a cyclin protein family member. The UNG2 symbol is also used as a specific protein isoform name for the UNG gene (GeneID 7374), so confusion exists in the scientific literature and in some databases for these two genes. [provided by RefSeq, Jul 2014]

CCNO Gene-Disease associations (from GenCC):

• primary ciliary dyskinesia 29

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), G2P, ClinGen, Ambry Genetics
• primary ciliary dyskinesia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. Fraction of 0.0874 CDS is truncated, and there are 2 pathogenic variants in the truncated region.
• PP5: Variant 5-55231467-G-A is Pathogenic according to our data. Variant chr5-55231467-G-A is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 139602.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_021147.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CCNO	NM_021147.5	MANE Select	c.961C>T	p.Gln321*	stop_gained	Exon 3 of 3	NP_066970.3	P22674-1
	CCNO	NR_125346.2		n.1422C>T		non_coding_transcript_exon	Exon 3 of 3
	CCNO	NR_125347.2		n.1051C>T		non_coding_transcript_exon	Exon 3 of 3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CCNO	ENST00000282572.5	TSL:1 MANE Select	c.961C>T	p.Gln321*	stop_gained	Exon 3 of 3	ENSP00000282572.4	P22674-1
	CCNO	ENST00000501463.2	TSL:1	n.*941C>T		non_coding_transcript_exon	Exon 3 of 3	ENSP00000422485.1	P22674-2
	CCNO	ENST00000501463.2	TSL:1	n.*941C>T		3_prime_UTR	Exon 3 of 3	ENSP00000422485.1	P22674-2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000479 AC: 7 AN: 1461768 Hom.: 0 Cov.: 31 AF XY: 0.00000413 AC XY: 3 AN XY: 727202

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53310

Middle Eastern (MID) AF: 0.000173 AC: 1 AN: 5768

European-Non Finnish (NFE) AF: 0.00000270 AC: 3 AN: 1111996

Other (OTH) AF: 0.0000331 AC: 2 AN: 60396

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

ClinVar submissions

Significance: Likely pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	Primary ciliary dyskinesia (1)
1	-	-	Primary ciliary dyskinesia 29 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.60	D
BayesDel_noAF	Pathogenic	0.48
CADD	Pathogenic	41
DANN	Uncertain	1.0
Eigen	Pathogenic	0.83
Eigen_PC	Pathogenic	0.71
FATHMM_MKL	Uncertain	0.88	D
PhyloP100		3.8
Vest4		0.76
GERP RS		5.7
Mutation Taster		=26/174	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs587777501; hg19: chr5-54527295;