X-101398945-G-A

Position:

• chrX-101398945-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_000169.3(GLA):​c.641C>T​(p.Pro214Leu) variant causes a missense, splice region change. The variant allele was found at a frequency of 0.000000918 in 1,088,937 control chromosomes in the GnomAD database, with no homozygous occurrence. There are no hemizygote samples in GnomAD. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 23)
  • Exomes 𝑓: 9.2e-7 (0 hom. 0 hem.)
• Consequence: GLA NM_000169.3 missense, splice_region
• Scores: Splicing: ADA: 0.06452
• Clinical Significance: Uncertain significance criteria provided, single submitter P:1 U:1 O:1
• Conservation: PhyloP100: 6.88

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]

GLA (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.912

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GLA	NM_000169.3	c.641C>T	p.Pro214Leu	missense_variant, splice_region_variant	5/7	ENST00000218516.4	NP_000160.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GLA	ENST00000218516.4	c.641C>T	p.Pro214Leu	missense_variant, splice_region_variant	5/7	1	NM_000169.3	ENSP00000218516.4
RPL36A-HNRNPH2	ENST00000409170.3	c.300+3488G>A		intron_variant		4		ENSP00000386655.4

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome AF: 9.18e-7 AC: 1 AN: 1088937 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 355149

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: 0.00000120

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 23

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:1 Uncertain:1 Other:1

Revision: criteria provided, single submitter

Submissions by phenotype

Fabry disease Pathogenic:1 Uncertain:1

Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jul 06, 2022	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. This variant disrupts the p.Pro214 amino acid residue in GLA. Other variant(s) that disrupt this residue have been observed in individuals with GLA-related conditions (PMID: 23756194), which suggests that this may be a clinically significant amino acid residue. Experimental studies have shown that this missense change affects GLA function (PMID: 26415523). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). ClinVar contains an entry for this variant (Variation ID: 217392). This missense change has been observed in individual(s) with Fabry disease (PMID: 26415523, 30261035). This variant is not present in population databases (gnomAD no frequency). This sequence change replaces proline, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 214 of the GLA protein (p.Pro214Leu). -
Likely pathogenic, no assertion criteria provided	research	Albrecht-Kossel-Institute, Medical University Rostock	Jan 01, 2014	- -

Migalastat response Other:1

drug response, no assertion criteria provided

research

Albrecht-Kossel-Institute, Medical University Rostock

Jan 01, 2014

- Pharmacological Chaperone response: yes

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.31
CardioboostCm	Uncertain	0.87
BayesDel_addAF	Pathogenic	0.54	D
BayesDel_noAF	Pathogenic	0.54
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.94	D;.
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Uncertain	0.94	D;D
M_CAP	Pathogenic	0.97	D
MetaRNN	Pathogenic	0.91	D;D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Pathogenic	3.3	M;.
PrimateAI	Uncertain	0.55	T
PROVEAN	Pathogenic	-6.5	D;.
REVEL	Pathogenic	0.85
Sift	Benign	0.045	D;.
Sift4G	Benign	0.13	T;.
Polyphen		0.98	D;.
Vest4		0.91
MutPred		0.69		Loss of ubiquitination at K213 (P = 0.051);.;
MVP		0.99
MPC		1.7
ClinPred		0.99	D
GERP RS		5.1
Varity_R		0.88
gMVP		0.99

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.065
dbscSNV1_RF	Benign	0.35
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: rs869312150; hg19: chrX-100653933;