chr11-110580396-T-C

Position:

• chr11-110580396-T-C

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001384657.1(ARHGAP20):​c.2550A>G​(p.Ile850Met) 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. 14/21 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. I850T) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: ARHGAP20 NM_001384657.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -1.37

Genes affected

ARHGAP20 (HGNC:18357): (Rho GTPase activating protein 20) The protein encoded by this gene is an activator of RHO-type GTPases, transducing a signal from RAP1 to RHO and impacting neurite outgrowth. [provided by RefSeq, Sep 2016]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.041140646).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ARHGAP20	NM_001384657.1	c.2550A>G	p.Ile850Met	missense_variant	15/15	ENST00000683387.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ARHGAP20	ENST00000683387.1	c.2550A>G	p.Ile850Met	missense_variant	15/15		NM_001384657.1	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

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

Jun 29, 2023

The c.2550A>G (p.I850M) alteration is located in exon 16 (coding exon 15) of the ARHGAP20 gene. This alteration results from a A to G substitution at nucleotide position 2550, causing the isoleucine (I) at amino acid position 850 to be replaced by a methionine (M). 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	0.070
BayesDel_addAF	Benign	-0.30	T
BayesDel_noAF	Benign	-0.67
CADD	Benign	0.29
DANN	Benign	0.93
DEOGEN2	Benign	0.057	T;T;.;.;.;.
Eigen	Benign	-0.92
Eigen_PC	Benign	-1.0
FATHMM_MKL	Benign	0.048	N
LIST_S2	Benign	0.67	T;T;T;.;T;T
M_CAP	Benign	0.0050	T
MetaRNN	Benign	0.041	T;T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Uncertain	2.4	M;.;.;.;.;.
MutationTaster	Benign	1.0	N;N;N;N;N;N;N
PrimateAI	Benign	0.28	T
PROVEAN	Benign	-0.75	N;N;N;N;N;N
REVEL	Benign	0.046
Sift	Benign	0.089	T;T;T;T;T;T
Sift4G	Benign	0.10	T;T;T;T;T;T
Polyphen		0.19	B;.;B;.;B;.
Vest4		0.077
MutPred		0.14		Loss of helix (P = 0.028);.;.;.;.;.;
MVP		0.18
MPC		0.11
ClinPred		0.25	T
GERP RS		-3.8
Varity_R		0.073
gMVP		0.17

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: chr11-110451120;