chr7-26193619-T-C

Position:

• chr7-26193619-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 5P and 2B. PM1 PM2 PP2 BP4_Moderate

The NM_002137.4(HNRNPA2B1):​c.797A>G​(p.Asn266Ser) variant causes a missense change. The variant allele was found at a frequency of 0.000000685 in 1,458,950 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: 6.9e-7 (0 hom.)
• Consequence: HNRNPA2B1 NM_002137.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 4.75

Genes affected

HNRNPA2B1 (HGNC:5033): (heterogeneous nuclear ribonucleoprotein A2/B1) This gene belongs to the A/B subfamily of ubiquitously expressed heterogeneous nuclear ribonucleoproteins (hnRNPs). The hnRNPs are RNA binding proteins and they complex with heterogeneous nuclear RNA (hnRNA). These proteins are associated with pre-mRNAs in the nucleus and appear to influence pre-mRNA processing and other aspects of mRNA metabolism and transport. While all of the hnRNPs are present in the nucleus, some seem to shuttle between the nucleus and the cytoplasm. The hnRNP proteins have distinct nucleic acid binding properties. The protein encoded by this gene has two repeats of quasi-RRM domains that bind to RNAs. This gene has been described to generate two alternatively spliced transcript variants which encode different isoforms. [provided by RefSeq, Jul 2008]

HNRNPA2B1 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM1: In a modified_residue Asymmetric dimethylarginine; alternate (size 0) in uniprot entity ROA2_HUMAN
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), HNRNPA2B1. . Gene score misZ 3.0018 (greater than the threshold 3.09). Trascript score misZ 3.7844 (greater than threshold 3.09). GenCC has associacion of gene with inclusion body myopathy with early-onset Paget disease with or without frontotemporal dementia 2, amyotrophic lateral sclerosis, inclusion body myopathy with Paget disease of bone and frontotemporal dementia.
• BP4: Computational evidence support a benign effect (MetaRNN=0.19716454).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
HNRNPA2B1	NM_002137.4	c.797A>G	p.Asn266Ser	missense_variant	8/11	ENST00000618183.5	NP_002128.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
HNRNPA2B1	ENST00000618183.5	c.797A>G	p.Asn266Ser	missense_variant	8/11	5	NM_002137.4	ENSP00000478691.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1458950 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 725868

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: 0.00

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000936 Hom.: 0

Bravo AF: 0.0000113

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Inclusion body myopathy with early-onset Paget disease with or without frontotemporal dementia 2 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jun 12, 2017

In summary, this variant has uncertain impact on HNRNPA2B1 function. The available evidence is currently insufficient to determine its role in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C45"). This variant has not been reported in the literature in individuals with an HNRNPA2B1-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces asparagine with serine at codon 278 of the HNRNPA2B1 protein (p.Asn278Ser). The asparagine residue is highly conserved and there is a small physicochemical difference between asparagine and serine. -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Feb 18, 2021

Not observed in large population cohorts (Lek et al., 2016); In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.086
BayesDel_addAF	Benign	-0.020	T
BayesDel_noAF	Benign	-0.27
CADD	Benign	22
DANN	Uncertain	0.99
DEOGEN2	Benign	0.20	.;T;.
Eigen	Benign	0.11
Eigen_PC	Benign	0.17
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.86	.;.;D
M_CAP	Benign	0.0054	T
MetaRNN	Benign	0.20	T;T;T
MetaSVM	Benign	-0.99	T
MutationAssessor	Benign	1.5	.;L;.
PrimateAI	Uncertain	0.64	T
PROVEAN	Benign	-1.6	.;N;N
REVEL	Benign	0.20
Sift	Benign	0.25	.;T;T
Sift4G	Benign	0.20	.;T;T
Polyphen		0.034	B;B;B
Vest4		0.37, 0.36
MutPred		0.30		.;Gain of glycosylation at N278 (P = 0.0042);.;
MVP		0.79
MPC		1.3
ClinPred		0.77	D
GERP RS		4.9
RBP_binding_hub_radar		1.1
RBP_regulation_power_radar		2.8
Varity_R		0.51
gMVP		0.81

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: rs1554331125; hg19: chr7-26233239;