Genetic Variant BCOR:c.*298_*300dupAAA (chrX-40051808-A-ATTT) – ACMG Classification: Likely_benign (-4 pts)

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BS1

The NM_001123385.2(BCOR):c.*298_*300dupAAA variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.0 ( 0 hom., 0 hem., cov: 18)

Exomes 𝑓: 0.0011 ( 0 hom. 0 hem. )

Failed GnomAD Quality Control

Consequence

BCOR
NM_001123385.2 3_prime_UTR

Scores

Not classified

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -0.603

Variant links:

Genes affected

BCOR (HGNC:20893): (BCL6 corepressor) The protein encoded by this gene was identified as an interacting corepressor of BCL6, a POZ/zinc finger transcription repressor that is required for germinal center formation and may influence apoptosis. This protein selectively interacts with the POZ domain of BCL6, but not with eight other POZ proteins. Specific class I and II histone deacetylases (HDACs) have been shown to interact with this protein, which suggests a possible link between the two classes of HDACs. Several transcript variants encoding different isoforms have been found for this gene. A pseudogene of this gene is found on chromosome Y.[provided by RefSeq, Jun 2010]

BCOR links:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -4 ACMG points.

BS1

Variant frequency is greater than expected in population mid. GnomAdExome4 allele frequency = 0.00114 (131/115197) while in subpopulation MID AF = 0.00193 (1/517). AF 95% confidence interval is 0.00114. There are 0 homozygotes in GnomAdExome4. There are 0 alleles in the male GnomAdExome4 subpopulation. Median coverage is 0. This position passed quality control check.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BCOR	NM_001123385.2 link	c.298_300dupAAA		3_prime_UTR_variant	Exon 15 of 15	ENST00000378444.9	NP_001116857.1	Q6W2J9-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BCOR	ENST00000378444.9 link	c.298_300dupAAA		3_prime_UTR_variant	Exon 15 of 15	1	NM_001123385.2	ENSP00000367705.4		Q6W2J9-1

Frequencies

GnomAD3 genomes

AF:

0.00

AC:

AN:

109252

Hom.:

Cov.:

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:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00114

AC:

131

AN:

115197

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

28709

show subpopulations

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

African (AFR)

AF:

0.00142

AC:

AN:

4232

American (AMR)

AF:

0.000200

AC:

AN:

4990

Ashkenazi Jewish (ASJ)

AF:

0.000840

AC:

AN:

4764

East Asian (EAS)

AF:

0.00

AC:

AN:

11929

South Asian (SAS)

AF:

0.000849

AC:

AN:

2355

European-Finnish (FIN)

AF:

0.00116

AC:

AN:

5192

Middle Eastern (MID)

AF:

0.00193

AC:

AN:

517

European-Non Finnish (NFE)

AF:

0.00136

AC:

AN:

72816

Other (OTH)

AF:

0.00143

AC:

AN:

8402

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.257

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Data not reliable, filtered out with message: AC0

AF:

0.00

AC:

AN:

109295

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

31863

African (AFR)

AF:

0.00

AC:

AN:

30007

American (AMR)

AF:

0.00

AC:

AN:

10193

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

2606

East Asian (EAS)

AF:

0.00

AC:

AN:

3548

South Asian (SAS)

AF:

0.00

AC:

AN:

2576

European-Finnish (FIN)

AF:

0.00

AC:

AN:

5665

Middle Eastern (MID)

AF:

0.00

AC:

AN:

209

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

52352

Other (OTH)

AF:

0.00

AC:

AN:

1481

Alfa

AF:

0.00

Hom.:

384

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

-0.60

Mutation Taster

=100/0

polymorphism

(source)

Splicing

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

Publications

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X-40051808-AT-ATTTT

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

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