20-31721977-A-T

Position:

• chr20-31721977-A-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_138578.3(BCL2L1):​c.242T>A​(p.Ile81Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,884 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: BCL2L1 NM_138578.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.81

Genes affected

BCL2L1 (HGNC:992): (BCL2 like 1) The protein encoded by this gene belongs to the BCL-2 protein family. BCL-2 family members form hetero- or homodimers and act as anti- or pro-apoptotic regulators that are involved in a wide variety of cellular activities. The proteins encoded by this gene are located at the outer mitochondrial membrane, and have been shown to regulate outer mitochondrial membrane channel (VDAC) opening. VDAC regulates mitochondrial membrane potential, and thus controls the production of reactive oxygen species and release of cytochrome C by mitochondria, both of which are the potent inducers of cell apoptosis. Alternative splicing results in multiple transcript variants encoding two different isoforms. The longer isoform acts as an apoptotic inhibitor and the shorter isoform acts as an apoptotic activator. [provided by RefSeq, Dec 2015]

ABALON (HGNC:49667): (apoptotic BCL2L1-antisense long non-coding RNA)

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.20224541).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BCL2L1	NM_138578.3	c.242T>A	p.Ile81Asn	missense_variant	2/3	ENST00000307677.5
ABALON	NR_131907.1	n.471A>T		non_coding_transcript_exon_variant	1/1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BCL2L1	ENST00000307677.5	c.242T>A	p.Ile81Asn	missense_variant	2/3	1	NM_138578.3	P1
ABALON	ENST00000629058.1	n.471A>T		non_coding_transcript_exon_variant	1/1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461884 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727244

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: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

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

Mar 01, 2024

The c.242T>A (p.I81N) alteration is located in exon 2 (coding exon 1) of the BCL2L1 gene. This alteration results from a T to A substitution at nucleotide position 242, causing the isoleucine (I) at amino acid position 81 to be replaced by an asparagine (N). 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	0.21
BayesDel_addAF	Benign	-0.16	T
BayesDel_noAF	Benign	-0.46
CADD	Uncertain	25
DANN	Benign	0.97
DEOGEN2	Benign	0.29	T;.;T;.;.;.;.;T
Eigen	Benign	-0.23
Eigen_PC	Benign	0.011
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Uncertain	0.90	.;D;D;D;.;.;D;D
M_CAP	Benign	0.0070	T
MetaRNN	Benign	0.20	T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.87	T
MutationAssessor	Benign	0.34	N;N;N;.;.;.;.;.
MutationTaster	Benign	0.93	D;D;D;D
PrimateAI	Uncertain	0.73	T
PROVEAN	Benign	-0.14	N;N;N;N;N;N;N;N
REVEL	Benign	0.10
Sift	Uncertain	0.018	D;T;D;T;T;T;T;T
Sift4G	Benign	0.50	T;T;T;.;T;T;T;T
Polyphen		0.0010	B;.;B;.;.;.;.;.
Vest4		0.35
MutPred		0.48		Gain of disorder (P = 0.0068);Gain of disorder (P = 0.0068);Gain of disorder (P = 0.0068);Gain of disorder (P = 0.0068);Gain of disorder (P = 0.0068);Gain of disorder (P = 0.0068);Gain of disorder (P = 0.0068);Gain of disorder (P = 0.0068);
MVP		0.44
MPC		1.1
ClinPred		0.37	T
GERP RS		5.6
Varity_R		0.63
gMVP		0.77

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr20-30309780;