chr2-27929881-A-G

Position:

• chr2-27929881-A-G

Variant summary

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

The NM_199191.3(BABAM2):​c.178A>G​(p.Ile60Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000616 in 1,461,206 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000062 (0 hom.)
• Consequence: BABAM2 NM_199191.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.54

Genes affected

BABAM2 (HGNC:1106): (BRISC and BRCA1 A complex member 2) This gene encodes an anti-apoptotic, death receptor-associated protein that interacts with tumor necrosis factor-receptor-1. The encoded protein acts as an adapter in several protein complexes, including the BRCA1-A complex and the BRISC complex. The BRCA1-A complex possesses ubiquitinase activity and targets sites of double strand DNA breaks, while the BRISC complex exhibits deubiquitinase activity and is involved in mitotic spindle assembly. This gene is upregulated in several types of cancer. [provided by RefSeq, Jun 2016]

MRPL33 (HGNC:14487): (mitochondrial ribosomal protein L33) Mammalian mitochondrial ribosomal proteins are encoded by nuclear genes and help in protein synthesis within the mitochondrion. Mitochondrial ribosomes (mitoribosomes) consist of a small 28S subunit and a large 39S subunit. They have an estimated 75% protein to rRNA composition compared to prokaryotic ribosomes, where this ratio is reversed. Another difference between mammalian mitoribosomes and prokaryotic ribosomes is that the latter contain a 5S rRNA. Among different species, the proteins comprising the mitoribosome differ greatly in sequence, and sometimes in biochemical properties, which prevents easy recognition by sequence homology. This gene encodes a 39S subunit protein. Alternatively spliced transcript variants encoding different isoforms have been described. [provided by RefSeq, Jul 2008]

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
BABAM2	NM_199191.3	c.178A>G	p.Ile60Val	missense_variant	3/12	ENST00000379624.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BABAM2	ENST00000379624.6	c.178A>G	p.Ile60Val	missense_variant	3/12	1	NM_199191.3	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000616 AC: 9 AN: 1461206 Hom.: 0 Cov.: 30 AF XY: 0.00000688 AC XY: 5 AN XY: 726958

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: 0.00000810

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000756

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 14, 2023

The c.178A>G (p.I60V) alteration is located in exon 3 (coding exon 2) of the BRE gene. This alteration results from a A to G substitution at nucleotide position 178, causing the isoleucine (I) at amino acid position 60 to be replaced by a valine (V). 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	0.24
BayesDel_addAF	Benign	0.011	T
BayesDel_noAF	Benign	-0.22
CADD	Uncertain	23
DANN	Uncertain	1.0
DEOGEN2	Benign	0.068	T;.;T;T;.;.;.
Eigen	Uncertain	0.37
Eigen_PC	Uncertain	0.45
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.92	D;D;.;D;.;D;D
M_CAP	Benign	0.017	T
MetaRNN	Uncertain	0.61	D;D;D;D;D;D;D
MetaSVM	Benign	-0.60	T
MutationTaster	Benign	1.0	D;D;D;D;D
PrimateAI	Pathogenic	0.79	T
PROVEAN	Benign	-0.73	N;N;N;N;N;N;N
REVEL	Benign	0.25
Sift	Benign	0.066	T;T;T;T;T;T;T
Sift4G	Uncertain	0.051	T;D;D;D;D;D;T
Polyphen		0.65, 0.43, 0.38	.;P;B;B;B;B;.
Vest4		0.78, 0.79, 0.79
MutPred		0.70		Gain of catalytic residue at I60 (P = 0.0495);Gain of catalytic residue at I60 (P = 0.0495);Gain of catalytic residue at I60 (P = 0.0495);Gain of catalytic residue at I60 (P = 0.0495);Gain of catalytic residue at I60 (P = 0.0495);Gain of catalytic residue at I60 (P = 0.0495);Gain of catalytic residue at I60 (P = 0.0495);
MVP		0.44
MPC		0.56
ClinPred		0.93	D
GERP RS		5.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.20
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: rs1667970436; hg19: chr2-28152748;