NM_021147.5:c.264G>C

Variant names:

• chr5-55233260-C-G
• rs200127292
• NM_021147.5:c.264G>C

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_021147.5(CCNO):​c.264G>C​(p.Gln88His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000131 in 152,172 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Likely benign in ClinVar.

• Frequency: Genomes: 𝑓 0.000013 (0 hom., cov: 33)
• Consequence: CCNO NM_021147.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.10
• Publications: 0 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-DT (HGNC:55543): (CCNO divergent transcript)

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.11685705).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CCNO	NM_021147.5	c.264G>C	p.Gln88His	missense_variant	Exon 1 of 3	ENST00000282572.5	NP_066970.3
CCNO	NR_125346.2	n.349G>C		non_coding_transcript_exon_variant	Exon 1 of 3
CCNO	NR_125347.2	n.349G>C		non_coding_transcript_exon_variant	Exon 1 of 3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CCNO	ENST00000282572.5	c.264G>C	p.Gln88His	missense_variant	Exon 1 of 3	1	NM_021147.5	ENSP00000282572.4
CCNO	ENST00000501463.2	n.264G>C		non_coding_transcript_exon_variant	Exon 1 of 3	1		ENSP00000422485.1
CCNO-DT	ENST00000749853.1	n.184+27C>G		intron_variant	Intron 1 of 3

Frequencies

GnomAD3 genomes AF: 0.0000131 AC: 2 AN: 152172 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.0000483

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

GnomAD2 exomes AF: 0.00000994 AC: 2 AN: 201146 AF XY: 0.0000182

Gnomad AFR exome AF: 0.000175

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome Cov.: 32

GnomAD4 genome AF: 0.0000131 AC: 2 AN: 152172 Hom.: 0 Cov.: 33 AF XY: 0.0000269 AC XY: 2 AN XY: 74344

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.0000483 AC: 2 AN: 41450

American (AMR) AF: 0.00 AC: 0 AN: 15284

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3468

East Asian (EAS) AF: 0.00 AC: 0 AN: 5178

South Asian (SAS) AF: 0.00 AC: 0 AN: 4834

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10624

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 68018

Other (OTH) AF: 0.00 AC: 0 AN: 2088

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000151

ExAC AF: 0.00000837 AC: 1

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.10
BayesDel_addAF	Benign	-0.43	T
BayesDel_noAF	Benign	-0.59
CADD	Benign	12
DANN	Benign	0.96
DEOGEN2	Benign	0.11	T
Eigen	Benign	-0.27
Eigen_PC	Benign	-0.29
FATHMM_MKL	Uncertain	0.80	D
LIST_S2	Benign	0.35	T
M_CAP	Benign	0.017	T
MetaRNN	Benign	0.12	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.8	L
PhyloP100		1.1
PrimateAI	Uncertain	0.66	T
PROVEAN	Benign	-0.80	N
REVEL	Benign	0.039
Sift	Benign	0.29	T
Sift4G	Benign	0.18	T
Polyphen		0.84	P
Vest4		0.091
MutPred		0.15		Loss of loop (P = 0.1258);
MVP		0.58
MPC		0.61
ClinPred		0.17	T
GERP RS		3.5
PromoterAI		-0.039	Neutral
Varity_R		0.064
gMVP		0.44
Mutation Taster		=97/3	polymorphism

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: rs200127292; hg19: chr5-54529088;