17-79795332-C-T

Variant names:

• chr17-79795332-C-T
• rs748996167
• NM_020649.3:c.473G>A

Variant summary

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

The NM_020649.3(CBX8):​c.473G>A​(p.Arg158Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000758 in 1,583,328 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R158W) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.000013 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0000070 (0 hom.)
• Consequence: CBX8 NM_020649.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.89
• Publications: 0 publications found

Genes affected

CBX8 (HGNC:15962): (chromobox 8) Enables methylated histone binding activity. Involved in negative regulation of transcription by RNA polymerase II. Located in chromatin and nucleoplasm. Part of PRC1 complex. Biomarker of esophagus squamous cell carcinoma and glioblastoma. [provided by Alliance of Genome Resources, Apr 2022]

CBX8 Gene-Disease associations (from GenCC):

• schizophrenia

  Inheritance: Unknown Classification: NO_KNOWN Submitted by: Labcorp Genetics (formerly Invitae)

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=0.08297169).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_020649.3. 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
	CBX8	NM_020649.3	MANE Select	c.473G>A	p.Arg158Gln	missense	Exon 5 of 5	NP_065700.1	Q9HC52

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CBX8	ENST00000269385.9	TSL:1 MANE Select	c.473G>A	p.Arg158Gln	missense	Exon 5 of 5	ENSP00000269385.4	Q9HC52
	CBX8	ENST00000413392.5	TSL:3	c.443G>A	p.Arg148Gln	missense	Exon 5 of 5	ENSP00000405058.1	C9J6K3
	CBX8	ENST00000427800.2	TSL:2	c.398G>A	p.Arg133Gln	missense	Exon 5 of 5	ENSP00000408753.2	C9JM54

Frequencies

GnomAD3 genomes AF: 0.0000132 AC: 2 AN: 151928 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000415

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000146 AC: 3 AN: 204808 AF XY: 0.0000183

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000353

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.0000555

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000699 AC: 10 AN: 1431400 Hom.: 0 Cov.: 35 AF XY: 0.00000705 AC XY: 5 AN XY: 709586

African (AFR) AF: 0.0000301 AC: 1 AN: 33202

American (AMR) AF: 0.0000763 AC: 3 AN: 39310

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25450

East Asian (EAS) AF: 0.00 AC: 0 AN: 38588

South Asian (SAS) AF: 0.0000242 AC: 2 AN: 82674

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 51326

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5736

European-Non Finnish (NFE) AF: 0.00000183 AC: 2 AN: 1095640

Other (OTH) AF: 0.0000336 AC: 2 AN: 59474

GnomAD4 genome AF: 0.0000132 AC: 2 AN: 151928 Hom.: 0 Cov.: 32 AF XY: 0.0000270 AC XY: 2 AN XY: 74180

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

African (AFR) AF: 0.00 AC: 0 AN: 41452

American (AMR) AF: 0.00 AC: 0 AN: 15282

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5192

South Asian (SAS) AF: 0.000415 AC: 2 AN: 4824

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10522

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

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 67868

Other (OTH) AF: 0.00 AC: 0 AN: 2090

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Benign	-0.25	T
BayesDel_noAF	Benign	-0.60
CADD	Benign	19
DANN	Uncertain	0.98
DEOGEN2	Benign	0.078	T
Eigen	Benign	-0.49
Eigen_PC	Benign	-0.58
FATHMM_MKL	Benign	0.67	D
LIST_S2	Benign	0.82	T
M_CAP	Benign	0.0025	T
MetaRNN	Benign	0.083	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.0	N
PhyloP100		1.9
PrimateAI	Uncertain	0.72	T
PROVEAN	Benign	0.030	N
REVEL	Benign	0.049
Sift	Uncertain	0.018	D
Sift4G	Benign	0.69	T
Polyphen		0.92	P
Vest4		0.31
MutPred		0.19		Loss of MoRF binding (P = 0.0472)
MVP		0.29
MPC		0.24
ClinPred		0.083	T
GERP RS		2.3
Varity_R		0.078
gMVP		0.19
Mutation Taster		=93/7	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: rs748996167; hg19: chr17-77769131; COSMIC: COSV105034078; COSMIC: COSV105034078;