chrX-101397843-T-A

Position:

• chrX-101397843-T-A

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 4P and 1B. PM1 PM2 BP4

The NM_000169.3(GLA):​c.1256A>T​(p.Asn419Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000177 in 112,860 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. 15/21 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. N419D) has been classified as Uncertain significance.

• Frequency: Genomes: 𝑓 0.000018 (0 hom., 0 hem., cov: 24)
• Consequence: GLA NM_000169.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:2
• Conservation: PhyloP100: -0.414

Genes affected

GLA (HGNC:4296): (galactosidase alpha) This gene encodes a homodimeric glycoprotein that hydrolyses the terminal alpha-galactosyl moieties from glycolipids and glycoproteins. This enzyme predominantly hydrolyzes ceramide trihexoside, and it can catalyze the hydrolysis of melibiose into galactose and glucose. A variety of mutations in this gene affect the synthesis, processing, and stability of this enzyme, which causes Fabry disease, a rare lysosomal storage disorder that results from a failure to catabolize alpha-D-galactosyl glycolipid moieties. [provided by RefSeq, Jul 2008]

RPL36A-HNRNPH2 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 8 uncertain in NM_000169.3
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.29523334).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GLA	NM_000169.3	c.1256A>T	p.Asn419Ile	missense_variant	7/7	ENST00000218516.4
RPL36A-HNRNPH2	NM_001199973.2	c.300+2386T>A		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GLA	ENST00000218516.4	c.1256A>T	p.Asn419Ile	missense_variant	7/7	1	NM_000169.3	P1

Frequencies

GnomAD3 genomes AF: 0.0000177 AC: 2 AN: 112860 Hom.: 0 Cov.: 24 AF XY: 0.00 AC XY: 0 AN XY: 34988

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000374

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 29

GnomAD4 genome AF: 0.0000177 AC: 2 AN: 112860 Hom.: 0 Cov.: 24 AF XY: 0.00 AC XY: 0 AN XY: 34988

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000374

Gnomad4 OTH AF: 0.00

Bravo AF: 0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, single submitter

Submissions by phenotype

Fabry disease Uncertain:2

Uncertain significance, no assertion criteria provided	clinical testing	Natera, Inc.	Mar 11, 2021	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 28, 2023	In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt GLA protein function. ClinVar contains an entry for this variant (Variation ID: 405510). This variant has not been reported in the literature in individuals affected with GLA-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces asparagine, which is neutral and polar, with isoleucine, which is neutral and non-polar, at codon 419 of the GLA protein (p.Asn419Ile). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
CardioboostCm	Benign	0.030
BayesDel_addAF	Benign	-0.048	T
BayesDel_noAF	Benign	-0.31
CADD	Benign	1.2
DANN	Benign	0.76
DEOGEN2	Benign	0.17	T;.
FATHMM_MKL	Benign	0.059	N
LIST_S2	Benign	0.40	T;T
M_CAP	Pathogenic	0.90	D
MetaRNN	Benign	0.30	T;T
MetaSVM	Pathogenic	1.9	D
MutationAssessor	Benign	0.69	N;.
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.32	T
PROVEAN	Benign	0.77	N;.
REVEL	Benign	0.28
Sift	Benign	0.19	T;.
Sift4G	Benign	0.17	T;.
Polyphen		0.14	B;.
Vest4		0.28
MutPred		0.66		Gain of sheet (P = 0.0344);.;
MVP		0.73
MPC		0.90
ClinPred		0.084	T
GERP RS		0.45
Varity_R		0.22
gMVP		0.83

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: rs1060500749; hg19: chrX-100652831;