3-46989092-G-C

Variant summary

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

The NM_015175.3(NBEAL2):c.277G>C(p.Glu93Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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 (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. E93K) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: NBEAL2 NM_015175.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.13

Genes affected

NBEAL2 (HGNC:31928): (neurobeachin like 2) The protein encoded by this gene contains a beige and Chediak-Higashi (BEACH) domain and multiple WD40 domains, and may play a role in megakaryocyte alpha-granule biogenesis. Mutations in this gene are a cause of gray platelet syndrome. [provided by RefSeq, Dec 2011]

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=0.25630045).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
NBEAL2	NM_015175.3	c.277G>C	p.Glu93Gln	missense_variant	4/54	ENST00000450053.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NBEAL2	ENST00000450053.8	c.277G>C	p.Glu93Gln	missense_variant	4/54	2	NM_015175.3	P2
NBEAL2	ENST00000651747.1	c.256G>C	p.Glu86Gln	missense_variant	4/53			A2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 13, 2023

The c.277G>C (p.E93Q) alteration is located in exon 4 (coding exon 4) of the NBEAL2 gene. This alteration results from a G to C substitution at nucleotide position 277, causing the glutamic acid (E) at amino acid position 93 to be replaced by a glutamine (Q). 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	0.14
BayesDel_addAF	Benign	-0.094	T
BayesDel_noAF	Benign	-0.37
Cadd	Benign	21
Dann	Uncertain	0.98
DEOGEN2	Benign	0.042	T
Eigen	Benign	-0.16
Eigen_PC	Benign	-0.15
FATHMM_MKL	Uncertain	0.77	D
LIST_S2	Benign	0.85	T
M_CAP	Benign	0.034	D
MetaRNN	Benign	0.26	T
MetaSVM	Benign	-0.87	T
MutationAssessor	Uncertain	2.5	M
MutationTaster	Benign	0.72	D;D;N
PrimateAI	Uncertain	0.49	T
PROVEAN	Benign	-1.1	N
REVEL	Benign	0.047
Sift	Benign	0.11	T
Polyphen		0.062	B
Vest4		0.39
MutPred		0.23		Loss of sheet (P = 0.0457);
MVP		0.44
MPC		0.38
ClinPred		0.38	T
GERP RS		2.9
RBP_binding_hub_radar		0.92
RBP_regulation_power_radar		2.6
Varity_R		0.11
gMVP		0.46

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: chr3-47030582;