2-159324908-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_013450.4(BAZ2B):c.6256C>G(p.Leu2086Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000709 in 1,409,464 control chromosomes in the GnomAD database, with no homozygous occurrence. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 24)
  • Exomes 𝑓: 7.1e-7 (0 hom.)
• Consequence: BAZ2B NM_013450.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.97

Genes affected

BAZ2B (HGNC:963): (bromodomain adjacent to zinc finger domain 2B) This gene belongs to the bromodomain gene family. Members of this gene family encode proteins that are integral components of chromatin remodeling complexes. The encoded protein showed strong preference for the activating H3K14Ac mark in a histone peptide screen, suggesting a potential role in transcriptional activation. This gene may be associated with susceptibility to sudden cardiac death (SCD). [provided by RefSeq, Aug 2016]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BAZ2B	NM_013450.4	c.6256C>G	p.Leu2086Val	missense_variant	36/37	ENST00000392783.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BAZ2B	ENST00000392783.7	c.6256C>G	p.Leu2086Val	missense_variant	36/37	5	NM_013450.4	P1
BAZ2B	ENST00000392782.5	c.6148C>G	p.Leu2050Val	missense_variant	35/36	1
BAZ2B	ENST00000548440.1	n.770C>G		non_coding_transcript_exon_variant	3/4	3

Frequencies

GnomAD3 genomes Cov.: 24

GnomAD4 exome AF: 7.09e-7 AC: 1 AN: 1409464 Hom.: 0 Cov.: 28 AF XY: 0.00 AC XY: 0 AN XY: 700160

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.15e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 24

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 16, 2020

The alteration results in an amino acid change:_x000D_ _x000D_ The c.6256C>G (p.L2086V) alteration is located in exon 36 (coding exon 34) of the BAZ2B gene. This alteration results from a C to G substitution at nucleotide position 6256, causing the leucine (L) at amino acid position 2086 to be replaced by a valine (V). The alteration is not observed in population database:_x000D_ _x000D_ Based on data from the Genome Aggregation Database (gnomAD), the BAZ2B c.6256C>G alteration was not observed, with coverage at this position. The altered amino acid is conserved throughout evolution:_x000D_ _x000D_ The p.L2086 amino acid is conserved in available vertebrate species. The alteration is predicted tolerated by in silico modeling:_x000D_ _x000D_ The p.L2086V alteration is predicted to be tolerated by in silico analysis. Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.30
BayesDel_addAF	Benign	-0.042	T
BayesDel_noAF	Benign	-0.30
Cadd	Benign	23
Dann	Benign	0.97
Eigen	Pathogenic	0.70
Eigen_PC	Pathogenic	0.69
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Pathogenic	0.99	D;D
M_CAP	Benign	0.018	T
MetaRNN	Uncertain	0.74	D;D
MetaSVM	Benign	-0.90	T
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.78	T
PROVEAN	Benign	-2.3	N;N
REVEL	Benign	0.20
Sift	Uncertain	0.0070	D;D
Sift4G	Pathogenic	0.0010	D;D
Polyphen		0.99	D;D
Vest4		0.63
MutPred		0.67		.;Loss of stability (P = 0.334);
MVP		0.27
MPC		0.28
ClinPred		0.88	D
GERP RS		5.5
Varity_R		0.39
gMVP		0.49

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

Publications

LitVar

Other links and lift over

dbSNP: rs1226362424; hg19: chr2-160181419;