chrX-102749809-C-G

Position:

• chrX-102749809-C-G

Variant summary

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

The NM_001142524.2(GPRASP3):​c.814C>G​(p.Arg272Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000182 in 1,097,188 control chromosomes in the GnomAD database, with no homozygous occurrence. There are no hemizygote samples in GnomAD. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 23)
  • Exomes 𝑓: 0.0000018 (0 hom. 0 hem.)
• Consequence: GPRASP3 NM_001142524.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -2.60

Genes affected

GPRASP3 (HGNC:29353): (G protein-coupled receptor associated sorting protein family member 3) This gene is a member of a gene family which encodes proteins with a basic helix-loop-helix domain. Other members of this gene family encode proteins which function as transcription factors, either enhancing or inhibiting transcription depending on the activity of other DNA binding proteins. The coding region of this gene is located entirely within the terminal exon. The encoded protein may be involved in the survival of neurons (PMID: 15034937). Multiple alternatively spliced variants, encoding the same protein, have been identified. [provided by RefSeq, Sep 2011]

ARMCX5-GPRASP2 (HGNC:42000): (ARMCX5-GPRASP2 readthrough) This locus represents naturally occurring readthrough transcription among the adjacent armadillo repeat containing, X-linked 5 (ARMCX5), G protein-coupled receptor associated sorting proteins 1 and 2 (GPRASP1 and GPRASP2), basic helix-loop-helix family member b9 (BHLHB9), and long intergenic non-protein coding RNA 630 (LINC00630) genes on chromosome X. Transcripts may make use of multiple alternative promoters and polyadenylation signals in this region. Readthrough transcripts may produce proteins identical to the proteins encoded by GPRASP2 or BHLHB9. [provided by RefSeq, Apr 2017]

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=0.04121381).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GPRASP3	NM_001142524.2	c.814C>G	p.Arg272Gly	missense_variant	4/4	ENST00000457056.6
ARMCX5-GPRASP2	NR_146584.3	n.1218+28718C>G		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GPRASP3	ENST00000457056.6	c.814C>G	p.Arg272Gly	missense_variant	4/4	4	NM_001142524.2	P1
ARMCX5-GPRASP2	ENST00000652409.1	c.814C>G	p.Arg272Gly	missense_variant	8/8			P1

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome AF: 0.00000182 AC: 2 AN: 1097188 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 362628

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000238

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 23

Alfa AF: 0.0000936 Hom.: 0

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

May 04, 2023

The c.814C>G (p.R272G) alteration is located in exon 4 (coding exon 1) of the BHLHB9 gene. This alteration results from a C to G substitution at nucleotide position 814, causing the arginine (R) at amino acid position 272 to be replaced by a glycine (G). 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	0.075
BayesDel_addAF	Benign	-0.52	T
BayesDel_noAF	Benign	-0.99
CADD	Benign	0.0080
DANN	Benign	0.64
DEOGEN2	Benign	0.0036	T;T;T;T;T
FATHMM_MKL	Benign	0.013	N
LIST_S2	Benign	0.45	.;.;.;T;.
M_CAP	Benign	0.0033	T
MetaRNN	Benign	0.041	T;T;T;T;T
MetaSVM	Benign	-0.99	T
MutationAssessor	Benign	1.8	L;L;L;L;L
MutationTaster	Benign	1.0	N;N;N;N;N
PrimateAI	Benign	0.24	T
PROVEAN	Benign	0.77	N;N;N;N;N
REVEL	Benign	0.017
Sift	Benign	0.47	T;T;T;T;T
Sift4G	Benign	0.53	T;T;T;T;T
Polyphen		0.051	B;B;B;B;B
Vest4		0.12
MutPred		0.20		Loss of loop (P = 0.0112);Loss of loop (P = 0.0112);Loss of loop (P = 0.0112);Loss of loop (P = 0.0112);Loss of loop (P = 0.0112);
MVP		0.048
MPC		0.12
ClinPred		0.054	T
GERP RS		-3.6
Varity_R		0.050
gMVP		0.28

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: rs2082527438; hg19: chrX-102004737;