12-122054933-C-G

Position:

• chr12-122054933-C-G

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The ENST00000538010.5(BCL7A):​c.568C>G​(p.Arg190Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,884 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/18 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: BCL7A ENST00000538010.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.0430

Genes affected

BCL7A (HGNC:1004): (BAF chromatin remodeling complex subunit BCL7A) This gene is directly involved, with Myc and IgH, in a three-way gene translocation in a Burkitt lymphoma cell line. As a result of the gene translocation, the N-terminal region of the gene product is disrupted, which is thought to be related to the pathogenesis of a subset of high-grade B cell non-Hodgkin lymphoma. The N-terminal segment involved in the translocation includes the region that shares a strong sequence similarity with those of BCL7B and BCL7C. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.051706642).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BCL7A	NM_001024808.3	c.561+7C>G		splice_region_variant, intron_variant		ENST00000261822.5
BCL7A	NM_020993.5	c.568C>G	p.Arg190Gly	missense_variant	5/6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BCL7A	ENST00000538010.5	c.568C>G	p.Arg190Gly	missense_variant	5/6	1
BCL7A	ENST00000261822.5	c.561+7C>G		splice_region_variant, intron_variant		1	NM_001024808.3	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461884 Hom.: 0 Cov.: 31 AF XY: 0.00000275 AC XY: 2 AN XY: 727240

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: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 15, 2021

The c.568C>G (p.R190G) alteration is located in exon 5 (coding exon 5) of the BCL7A gene. This alteration results from a C to G substitution at nucleotide position 568, causing the arginine (R) at amino acid position 190 to be replaced by a glycine (G). 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
BayesDel_addAF	Benign	-0.25	T
BayesDel_noAF	Benign	-0.59
CADD	Benign	2.9
DANN	Benign	0.87
Eigen	Benign	-1.0
Eigen_PC	Benign	-1.1
FATHMM_MKL	Benign	0.052	N
M_CAP	Benign	0.0084	T
MetaRNN	Benign	0.052	T
MetaSVM	Benign	-1.1	T
MutationTaster	Benign	1.0	D;N
PrimateAI	Benign	0.34	T
PROVEAN	Benign	-0.72	N
REVEL	Benign	0.019
Sift	Benign	0.042	D
Sift4G	Benign	0.23	T
Polyphen		0.081	B
Vest4		0.15
MutPred		0.21		Gain of catalytic residue at R192 (P = 0.0037);
MVP		0.055
MPC		0.43
ClinPred		0.068	T
GERP RS		0.42
gMVP		0.13

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: rs556323322; hg19: chr12-122492839;