Genetic Variant CDKN2B-AS1:n.2909-541T>G (chr9-22118103-T-G) – ACMG Classification: Benign (-12 pts)

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_StrongBA1

The ENST00000643286.1(CDKN2B-AS1):n.516T>G variant causes a non coding transcript exon change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0218 in 152,384 control chromosomes in the GnomAD database, including 153 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.022 ( 153 hom., cov: 32)

Exomes 𝑓: 0.010 ( 0 hom. )

Consequence

CDKN2B-AS1
ENST00000643286.1 non_coding_transcript_exon

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.205

Publications

13 publications found

Variant links:

Genes affected

CDKN2B-AS1 (HGNC:34341): (CDKN2B antisense RNA 1) This gene is located within the CDKN2B-CDKN2A gene cluster at chromosome 9p21. The gene product is a functional RNA molecule that interacts with polycomb repressive complex-1 (PRC1) and -2 (PRC2), leading to epigenetic silencing of other genes in this cluster. This region is a significant genetic susceptibility locus for cardiovascular disease, and has also been linked to a number of other pathologies, including several cancers, intracranial aneurysm, type-2 diabetes, periodontitis, Alzheimer's disease, endometriosis, frailty in the elderly, and glaucoma. Multiple alternatively processed transcript variants have been detected, some of which may take the form of circular RNA molecules (PMID:21151960). [provided by RefSeq, May 2014]

CDKN2B-AS1 links:

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ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -12 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.85).

BA1

GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.178 is higher than 0.05.

Variant Effect in Transcripts

ACMG analysis was done for transcript: ENST00000643286.1. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank
CDKN2B-AS1	NR_003529.4	MANE Select	n.2909-541T>G	intron	N/A
CDKN2B-AS1	NR_047532.2		n.1698-541T>G	intron	N/A
CDKN2B-AS1	NR_047534.2		n.962-541T>G	intron	N/A

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank
CDKN2B-AS1	ENST00000428597.7	TSL:1 MANE Select	n.2909-541T>G	intron	N/A
CDKN2B-AS1	ENST00000422420.3	TSL:1	n.300-2097T>G	intron	N/A
CDKN2B-AS1	ENST00000577551.5	TSL:1	n.610-541T>G	intron	N/A

Frequencies

GnomAD3 genomes

AF:

0.0218

AC:

3318

AN:

152164

Hom.:

153

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0446

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00681

Gnomad ASJ

AF:

0.000289

Gnomad EAS

AF:

0.188

Gnomad SAS

AF:

0.0682

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00633

Gnomad NFE

AF:

0.000456

Gnomad OTH

AF:

0.0143

GnomAD4 exome

AF:

0.0100

AC:

AN:

100

Hom.:

Cov.:

AF XY:

0.0161

AC XY:

AN XY:

show subpopulations

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

African (AFR)

AF:

0.00

AC:

AN:

American (AMR)

AC:

AN:

Ashkenazi Jewish (ASJ)

AC:

AN:

East Asian (EAS)

AF:

0.500

AC:

AN:

South Asian (SAS)

AC:

AN:

European-Finnish (FIN)

AF:

0.00

AC:

AN:

Middle Eastern (MID)

AC:

AN:

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

Other (OTH)

AF:

0.00

AC:

AN:

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.325

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.0218

AC:

3322

AN:

152284

Hom.:

153

Cov.:

AF XY:

0.0228

AC XY:

1698

AN XY:

74468

show subpopulations

African (AFR)

AF:

0.0445

AC:

1851

AN:

41562

American (AMR)

AF:

0.00680

AC:

104

AN:

15302

Ashkenazi Jewish (ASJ)

AF:

0.000289

AC:

AN:

3464

East Asian (EAS)

AF:

0.188

AC:

972

AN:

5164

South Asian (SAS)

AF:

0.0683

AC:

329

AN:

4820

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10626

Middle Eastern (MID)

AF:

0.00680

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000456

AC:

AN:

68024

Other (OTH)

AF:

0.0151

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.504

Heterozygous variant carriers

152

304

457

609

761

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

138

184

230

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0222

Hom.:

Bravo

AF:

0.0231

Asia WGS

AF:

0.0890

AC:

308

AN:

3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.85

CADD

Benign

3.6

(source)

DANN

Benign

0.71

PhyloP100

0.20

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over