3-38478523-G-A

Position:

• chr3-38478523-G-A

Variant summary

Our verdict is Benign. Variant got -16 ACMG points: 0P and 16B. BP6_Very_Strong BS1 BS2

The NM_001106.4(ACVR2B):​c.666+5G>A variant causes a splice donor 5th base, intron change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0013 in 1,614,118 control chromosomes in the GnomAD database, including 21 homozygotes. In-silico tool predicts a benign outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0070 (8 hom., cov: 32)
  • Exomes 𝑓: 0.00071 (13 hom.)
• Consequence: ACVR2B NM_001106.4 splice_donor_5th_base, intron
• Scores: Splicing: ADA: 0.9992
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:3
• Conservation: PhyloP100: 7.48

Genes affected

ACVR2B (HGNC:174): (activin A receptor type 2B) Activins are dimeric growth and differentiation factors which belong to the transforming growth factor-beta (TGF-beta) superfamily of structurally related signaling proteins. Activins signal through a heteromeric complex of receptor serine kinases which include at least two type I (I and IB) and two type II (II and IIB) receptors. These receptors are all transmembrane proteins, composed of a ligand-binding extracellular domain with cysteine-rich region, a transmembrane domain, and a cytoplasmic domain with predicted serine/threonine specificity. Type I receptors are essential for signaling; and type II receptors are required for binding ligands and for expression of type I receptors. Type I and II receptors form a stable complex after ligand binding, resulting in phosphorylation of type I receptors by type II receptors. Type II receptors are considered to be constitutively active kinases. This gene encodes activin A type IIB receptor, which displays a 3- to 4-fold higher affinity for the ligand than activin A type II receptor. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Benign. Variant got -16 ACMG points.

• BP6: Variant 3-38478523-G-A is Benign according to our data. Variant chr3-38478523-G-A is described in ClinVar as [Benign]. Clinvar id is 238305.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr3-38478523-G-A is described in Lovd as [Likely_benign].
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.007 (1066/152302) while in subpopulation AFR AF= 0.0247 (1026/41564). AF 95% confidence interval is 0.0234. There are 8 homozygotes in gnomad4. There are 494 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High AC in GnomAd4 at 1066 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ACVR2B	NM_001106.4	c.666+5G>A		splice_donor_5th_base_variant, intron_variant		ENST00000352511.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ACVR2B	ENST00000352511.5	c.666+5G>A		splice_donor_5th_base_variant, intron_variant		1	NM_001106.4	P1
ACVR2B	ENST00000461232.1	n.4455+5G>A		splice_donor_5th_base_variant, intron_variant, non_coding_transcript_variant		1
ACVR2B	ENST00000465020.5	n.752+5G>A		splice_donor_5th_base_variant, intron_variant, non_coding_transcript_variant		2

Frequencies

GnomAD3 genomes AF: 0.00699 AC: 1064 AN: 152184 Hom.: 9 Cov.: 32

Gnomad AFR AF: 0.0247

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00170

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: 0.0000441

Gnomad OTH AF: 0.00526

GnomAD3 exomes AF: 0.00180 AC: 452 AN: 251260 Hom.: 6 AF XY: 0.00121 AC XY: 164 AN XY: 135814

Gnomad AFR exome AF: 0.0253

Gnomad AMR exome AF: 0.000752

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000653

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000528

Gnomad OTH exome AF: 0.000978

GnomAD4 exome AF: 0.000705 AC: 1031 AN: 1461816 Hom.: 13 Cov.: 33 AF XY: 0.000550 AC XY: 400 AN XY: 727208

Gnomad4 AFR exome AF: 0.0256

Gnomad4 AMR exome AF: 0.00105

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000464

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000306

Gnomad4 OTH exome AF: 0.00142

GnomAD4 genome AF: 0.00700 AC: 1066 AN: 152302 Hom.: 8 Cov.: 32 AF XY: 0.00663 AC XY: 494 AN XY: 74470

Gnomad4 AFR AF: 0.0247

Gnomad4 AMR AF: 0.00170

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000441

Gnomad4 OTH AF: 0.00520

Alfa AF: 0.00349 Hom.: 2

Bravo AF: 0.00822

Asia WGS AF: 0.000289 AC: 1 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:1

Benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

-

- -

Heterotaxy, visceral, 4, autosomal Benign:1

Benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 29, 2024

- -

not provided Benign:1

Benign, criteria provided, single submitter

clinical testing

GeneDx

Mar 03, 2015

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.39
CADD	Uncertain	24
DANN	Benign	0.95
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.90
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: rs187763364; hg19: chr3-38520014;