12-77831597-G-C

Position:

• chr12-77831597-G-C

Variant summary

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

The NM_001024383.2(NAV3):​c.136G>C​(p.Glu46Gln) 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. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: NAV3 NM_001024383.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.87

Genes affected

NAV3 (HGNC:15998): (neuron navigator 3) This gene belongs to the neuron navigator family and is expressed predominantly in the nervous system. The encoded protein contains coiled-coil domains and a conserved AAA domain characteristic for ATPases associated with a variety of cellular activities. This gene is similar to unc-53, a Caenorhabditis elegans gene involved in axon guidance. Multiple alternatively spliced transcript variants for this gene have been described but only one has had its full-length nature determined. [provided by RefSeq, Jul 2008]

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=0.23950538).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
NAV3	NM_001024383.2	c.136G>C	p.Glu46Gln	missense_variant	1/40	ENST00000397909.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NAV3	ENST00000397909.7	c.136G>C	p.Glu46Gln	missense_variant	1/40	1	NM_001024383.2
NAV3	ENST00000536525.6	c.136G>C	p.Glu46Gln	missense_variant	1/39	1		P1
NAV3	ENST00000549464.5	c.136G>C	p.Glu46Gln	missense_variant	1/10	5
NAV3	ENST00000550042.2	c.73-108722G>C		intron_variant		5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

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

Dec 21, 2022

The c.136G>C (p.E46Q) alteration is located in exon 1 (coding exon 1) of the NAV3 gene. This alteration results from a G to C substitution at nucleotide position 136, causing the glutamic acid (E) at amino acid position 46 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	0.084
BayesDel_addAF	Benign	-0.18	T
BayesDel_noAF	Benign	-0.49
CADD	Benign	22
DANN	Uncertain	0.98
DEOGEN2	Benign	0.015	T;.;T
Eigen	Benign	-0.16
Eigen_PC	Benign	0.018
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Benign	0.78	T;T;T
M_CAP	Benign	0.0046	T
MetaRNN	Benign	0.24	T;T;T
MetaSVM	Benign	-0.99	T
MutationAssessor	Benign	0.69	.;N;N
MutationTaster	Benign	1.0	N;N;N;N
PrimateAI	Benign	0.30	T
PROVEAN	Benign	-0.48	N;N;N
REVEL	Benign	0.042
Sift	Uncertain	0.014	D;D;D
Sift4G	Benign	0.23	T;T;T
Polyphen		0.018, 0.037	.;B;B
Vest4		0.029, 0.050
MutPred		0.16		Loss of phosphorylation at S49 (P = 0.0924);Loss of phosphorylation at S49 (P = 0.0924);Loss of phosphorylation at S49 (P = 0.0924);
MVP		0.18
MPC		0.14
ClinPred		0.14	T
GERP RS		4.7
Varity_R		0.073
gMVP		0.32

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: chr12-78225377;