NM_001172.4:c.18C>G

Variant names:

• chr14-67619995-C-G
• rs925334489
• NM_001172.4:c.18C>G

Variant summary

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

The NM_001172.4(ARG2):​c.18C>G​(p.Ser6Arg) 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. 16/21 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)
• Consequence: ARG2 NM_001172.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.0600

Genes affected

ARG2 (HGNC:664): (arginase 2) Arginase catalyzes the hydrolysis of arginine to ornithine and urea. At least two isoforms of mammalian arginase exists (types I and II) which differ in their tissue distribution, subcellular localization, immunologic crossreactivity and physiologic function. The type II isoform encoded by this gene, is located in the mitochondria and expressed in extra-hepatic tissues, especially kidney. The physiologic role of this isoform is poorly understood; it is thought to play a role in nitric oxide and polyamine metabolism. Transcript variants of the type II gene resulting from the use of alternative polyadenylation sites have been described. [provided by RefSeq, Jul 2008]

GPHN (HGNC:15465): (gephyrin) This gene encodes a neuronal assembly protein that anchors inhibitory neurotransmitter receptors to the postsynaptic cytoskeleton via high affinity binding to a receptor subunit domain and tubulin dimers. In nonneuronal tissues, the encoded protein is also required for molybdenum cofactor biosynthesis. Mutations in this gene may be associated with the neurological condition hyperplexia and also lead to molybdenum cofactor deficiency. Numerous alternatively spliced transcript variants encoding different isoforms have been described; however, the full-length nature of all transcript variants is not currently known. [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=0.11963314).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ARG2	NM_001172.4	c.18C>G	p.Ser6Arg	missense_variant	Exon 1 of 8	ENST00000261783.4	NP_001163.1
GPHN	XM_047430879.1	c.1313-115200C>G		intron_variant	Intron 14 of 14		XP_047286835.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ARG2	ENST00000261783.4	c.18C>G	p.Ser6Arg	missense_variant	Exon 1 of 8	1	NM_001172.4	ENSP00000261783.3
ARG2	ENST00000556491.1	n.16C>G		non_coding_transcript_exon_variant	Exon 1 of 4	5
ARG2	ENST00000557120.5	n.60C>G		non_coding_transcript_exon_variant	Exon 1 of 5	2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Mar 02, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.18C>G (p.S6R) alteration is located in exon 1 (coding exon 1) of the ARG2 gene. This alteration results from a C to G substitution at nucleotide position 18, causing the serine (S) at amino acid position 6 to be replaced by an arginine (R). 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	0.15
BayesDel_addAF	Benign	-0.015	T
BayesDel_noAF	Benign	-0.26
CADD	Benign	11
DANN	Benign	0.82
DEOGEN2	Benign	0.26	T
Eigen	Benign	-1.2
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.0093	N
LIST_S2	Benign	0.70	T
M_CAP	Benign	0.014	T
MetaRNN	Benign	0.12	T
MetaSVM	Benign	-0.71	T
MutationAssessor	Benign	0.95	L
PrimateAI	Benign	0.39	T
PROVEAN	Benign	-0.62	N
REVEL	Benign	0.27
Sift	Benign	0.38	T
Sift4G	Benign	0.56	T
Polyphen		0.0	B
Vest4		0.32
MutPred		0.41		Gain of catalytic residue at S6 (P = 0.0094);
MVP		0.66
MPC		0.20
ClinPred		0.066	T
GERP RS		-0.69
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.037
gMVP		0.62

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: rs925334489; hg19: chr14-68086712;