NM_032496.4:c.844G>A

Variant names:

• chr12-57477182-C-T
• NM_032496.4:c.844G>A

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_032496.4(ARHGAP9):​c.844G>A​(p.Gly282Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,460,634 control chromosomes in the GnomAD database, with no homozygous occurrence. 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: 31)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: ARHGAP9 NM_032496.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.282
• Publications: 0 publications found

Genes affected

ARHGAP9 (HGNC:14130): (Rho GTPase activating protein 9) This gene encodes a member of the Rho-GAP family of GTPase activating proteins. The protein has substantial GAP activity towards several Rho-family GTPases in vitro, converting them to an inactive GDP-bound state. It is implicated in regulating adhesion of hematopoietic cells to the extracellular matrix. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

MARS1 (HGNC:6898): (methionyl-tRNA synthetase 1) This gene encodes a member of the class I family of aminoacyl-tRNA synthetases. These enzymes play a critical role in protein biosynthesis by charging tRNAs with their cognate amino acids. The encoded protein is a component of the multi-tRNA synthetase complex and catalyzes the ligation of methionine to tRNA molecules. [provided by RefSeq, Jan 2011]

MARS1 Gene-Disease associations (from GenCC):

• Charcot-Marie-Tooth disease axonal type 2U

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet
• severe early-onset pulmonary alveolar proteinosis due to MARS deficiency

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet
• autosomal recessive spastic paraplegia type 70

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• Charcot-Marie-Tooth disease

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen
• spastic paraplegia 70, autosomal recessive

  Inheritance: Unknown Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)
• trichothiodystrophy 9, nonphotosensitive

  Inheritance: Unknown, AR Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Illumina

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.059073508).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ARHGAP9	NM_032496.4	c.844G>A	p.Gly282Arg	missense_variant	Exon 5 of 18	ENST00000393791.8	NP_115885.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ARHGAP9	ENST00000393791.8	c.844G>A	p.Gly282Arg	missense_variant	Exon 5 of 18	1	NM_032496.4	ENSP00000377380.3

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1460634 Hom.: 0 Cov.: 32 AF XY: 0.00000275 AC XY: 2 AN XY: 726542

African (AFR) AF: 0.00 AC: 0 AN: 33460

American (AMR) AF: 0.00 AC: 0 AN: 44574

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25990

East Asian (EAS) AF: 0.00 AC: 0 AN: 39680

South Asian (SAS) AF: 0.00 AC: 0 AN: 86096

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53388

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5756

European-Non Finnish (NFE) AF: 9.00e-7 AC: 1 AN: 1111352

Other (OTH) AF: 0.0000166 AC: 1 AN: 60338

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Aug 04, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.844G>A (p.G282R) alteration is located in exon 5 (coding exon 4) of the ARHGAP9 gene. This alteration results from a G to A substitution at nucleotide position 844, causing the glycine (G) at amino acid position 282 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	0.086
BayesDel_addAF	Benign	-0.17	T
BayesDel_noAF	Benign	-0.49
CADD	Benign	13
DANN	Benign	0.64
DEOGEN2	Benign	0.014	.;.;.;T;.;T;T;T;.
Eigen	Benign	-1.1
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.066	N
LIST_S2	Benign	0.68	T;T;T;.;T;T;T;T;T
M_CAP	Benign	0.0088	T
MetaRNN	Benign	0.059	T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Uncertain	2.1	M;M;.;.;.;.;.;.;.
PhyloP100		0.28
PrimateAI	Benign	0.29	T
PROVEAN	Benign	-0.41	N;N;N;.;N;N;N;N;N
REVEL	Benign	0.024
Sift	Benign	0.45	T;T;T;.;T;T;T;T;T
Sift4G	Benign	0.46	T;T;T;T;T;.;.;T;.
Polyphen		0.078	B;.;.;.;.;.;.;.;.
Vest4		0.14
MutPred		0.27		Gain of catalytic residue at L287 (P = 6e-04);Gain of catalytic residue at L287 (P = 6e-04);.;.;.;.;.;.;.;
MVP		0.35
MPC		0.054
ClinPred		0.29	T
GERP RS		0.93
gMVP		0.37
Mutation Taster		=84/16	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

hg19: chr12-57870965; COSMIC: COSV57362224; COSMIC: COSV57362224;