X-101401752-C-G

Variant names:

• chrX-101401752-C-G
• rs104894845
• NM_000169.3:c.427G>C

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM2 PP3_Strong PP5_Very_Strong

The NM_000169.3(GLA):​c.427G>C​(p.Ala143Pro) variant causes a missense change. 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 Likely pathogenic (★★).

• Frequency: Genomes: not found (cov: 23)
• Consequence: GLA NM_000169.3 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:7
• Conservation: PhyloP100: 6.12

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:48349): (RPL36A-HNRNPH2 readthrough) This locus represents naturally occurring read-through transcription between the neighboring ribosomal protein L36a and heterogeneous nuclear ribonucleoprotein H2 (H') genes on chromosome X. The read-through transcript produces a protein with similarity to the protein encoded by the upstream locus, ribosomal protein L36a. Alternatively spliced transcript variants have been identified. [provided by RefSeq, Jan 2011]

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.987
• PP5: Variant X-101401752-C-G is Pathogenic according to our data. Variant chrX-101401752-C-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 10769.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chrX-101401752-C-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GLA	NM_000169.3	c.427G>C	p.Ala143Pro	missense_variant	Exon 3 of 7	ENST00000218516.4	NP_000160.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GLA	ENST00000218516.4	c.427G>C	p.Ala143Pro	missense_variant	Exon 3 of 7	1	NM_000169.3	ENSP00000218516.4
RPL36A-HNRNPH2	ENST00000409170.3	c.300+6295C>G		intron_variant	Intron 4 of 4	4		ENSP00000386655.4

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 23

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:7

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Fabry disease Pathogenic:5

Jul 15, 2021

Genome-Nilou Lab

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Mar 01, 2002

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Jan 17, 2014

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The Arg143Pro variant in GLA as been reported in 6 males with Fabry disease, 5 o f whom were of Nova Scotian ancestry (Eng 1994, Branton 2002, Glass 2004). For 2 of them, absence of alpha-galatosidase enzyme activity was reported (Branton 2002). This variant was not identified in large population studies. Computation al analyses (biochemical amino acid properties, conservation, AlignGVGD, PolyPhe n2, and SIFT) do not provide strong support for or against an impact to the prot ein. Finally, another variant at this position (Arg143Thr) has been reported in multiple individuals with Fabry disease, segregated with disease (Spada 2006, Te rryn 2008), and is considered disease-causing, further supporting that a change at this position is not tolerated. In summary, the presence in multiple affected individuals, absence from large populations, and presence of another variant at the same position all support that this variant is likely to be pathogenic, tho ugh additional studies are required to fully establish its clinical significance . -

Jan 12, 2021

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: GLA c.427G>C (p.Ala143Pro) results in a non-conservative amino acid change in the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant was absent in 183467 control chromosomes (gnomAD). c.427G>C has been reported in the literature in at least an individual affected with Classic Fabry Disease (example: Eng_1994). These data indicate that the variant is likely to be associated with disease. Enzymatic activity from patient derived samples as well as in vitro studies reveal that the variant resulted in reduced or no enzymatic activity (Altarescu_2001, Lukas_2013). One other ClinVar submitter (evaluation after 2014) cite the variant as pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -

Sep 15, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

ClinVar contains an entry for this variant (Variation ID: 10769). This missense change has been observed in individual(s) with Fabry disease (PMID: 7531540, 17532296, 33437642). This variant is not present in population databases (gnomAD no frequency). This sequence change replaces alanine, which is neutral and non-polar, with proline, which is neutral and non-polar, at codon 143 of the GLA protein (p.Ala143Pro). 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 expected to disrupt GLA protein function. For these reasons, this variant has been classified as Pathogenic. -

not provided Pathogenic:2

Nov 13, 2013

Eurofins Ntd Llc (ga)

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Apr 23, 2016

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The A143P pathogenic variant has been reported previously in a patient with the classic phenotype of Fabry disease (Eng et al., 1994). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.80
CardioboostCm	Pathogenic	0.93
BayesDel_addAF	Pathogenic	0.64	D
BayesDel_noAF	Pathogenic	0.68
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.98	D;.
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.96	D;D
M_CAP	Pathogenic	0.71	D
MetaRNN	Pathogenic	0.99	D;D
MetaSVM	Pathogenic	0.86	D
MutationAssessor	Pathogenic	3.1	M;.
PrimateAI	Uncertain	0.59	T
PROVEAN	Uncertain	-3.8	D;.
REVEL	Pathogenic	0.86
Sift	Uncertain	0.0060	D;.
Sift4G	Uncertain	0.020	D;.
Polyphen		1.0	D;.
Vest4		0.85
MutPred		0.93		Gain of ubiquitination at K140 (P = 0.0671);.;
MVP		1.0
MPC		1.9
ClinPred		0.99	D
GERP RS		5.1
Varity_R		0.98
gMVP		0.99

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: rs104894845; hg19: chrX-100656740;