X-63638042-G-C

Position:

• chrX-63638042-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_001353921.2(ARHGEF9):​c.1558C>G​(p.Pro520Ala) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic 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. P520S) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 22)
• Consequence: ARHGEF9 NM_001353921.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.46

Genes affected

ARHGEF9 (HGNC:14561): (Cdc42 guanine nucleotide exchange factor 9) The protein encoded by this gene is a Rho-like GTPase that switches between the active (GTP-bound) state and inactive (GDP-bound) state to regulate CDC42 and other genes. This brain-specific protein also acts as an adaptor protein for the recruitment of gephyrin and together these proteins facilitate receceptor recruitement in GABAnergic and glycinergic synapses. Defects in this gene are the cause of startle disease with epilepsy (STHEE), also known as hyperekplexia with epilepsy, as well as several other types of cognitive disability. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2017]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.763

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ARHGEF9	NM_001353921.2	c.1558C>G	p.Pro520Ala	missense_variant	10/10	ENST00000671741.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ARHGEF9	ENST00000671741.2	c.1558C>G	p.Pro520Ala	missense_variant	10/10		NM_001353921.2	A1

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 22

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

Nov 17, 2023

The c.1537C>G (p.P513A) alteration is located in exon 10 (coding exon 10) of the ARHGEF9 gene. This alteration results from a C to G substitution at nucleotide position 1537, causing the proline (P) at amino acid position 513 to be replaced by an alanine (A). 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	0.16
BayesDel_addAF	Uncertain	0.15	D
BayesDel_noAF	Uncertain	-0.020
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.56	D;T;T;T;T;T;.;T;.;T;T;.;T;.;T
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.97	D;D;.;.;.;.;D;.;D;.;.;D;.;D;D
M_CAP	Uncertain	0.11	D
MetaRNN	Pathogenic	0.76	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	-0.014	T
MutationAssessor	Uncertain	2.4	M;.;.;.;.;.;.;.;.;.;.;.;.;.;.
MutationTaster	Benign	1.0	D;D;D;D;D;D
PrimateAI	Uncertain	0.74	T
PROVEAN	Pathogenic	-4.9	D;.;.;.;.;.;.;.;.;.;.;.;D;.;.
REVEL	Uncertain	0.57
Sift	Uncertain	0.029	D;.;.;.;.;.;.;.;.;.;.;.;D;.;.
Sift4G	Benign	0.072	T;.;.;.;.;.;T;T;.;.;.;.;T;T;.
Polyphen		0.98	D;.;.;.;.;.;.;.;.;.;.;.;.;.;.
Vest4		0.47
MutPred		0.40		Loss of disorder (P = 0.0379);.;.;.;.;.;.;.;.;.;.;.;.;.;.;
MVP		0.83
MPC		0.98
ClinPred		0.98	D
GERP RS		5.6
Varity_R		0.33
gMVP		0.75

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: chrX-62857922;