X-101398962-T-G

Variant names:

• chrX-101398962-T-G
• rs2071397
• NM_000169.3:c.640-16A>C

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 2P and 6B. PM2 BP4_Strong BP6_Moderate

The NM_000169.3(GLA):​c.640-16A>C variant causes a intron 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. Variant has been reported in ClinVar as Likely benign (★). There are indicators that this mutation may affect the branch point..

• Frequency:
  • Genomes: not found (cov: 23)
  • Exomes 𝑓: 9.4e-7 (0 hom. 0 hem.)
  • Failed GnomAD Quality Control
• Consequence: GLA NM_000169.3 intron
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -0.649
• Publications: 0 publications found

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

Our verdict: Likely_benign. The variant received -4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: This position, referring to a specific DNA site, is a probable branch point but is likely benign (scored 1 / 10, using the threshold of <=3). The score ranges from 0 to 10, with values ≤3 considered benign and >5 classified as pathogenic. Computational evidence support a benign effect (BayesDel_noAF=-0.9).
• BP6: Variant X-101398962-T-G is Benign according to our data. Variant chrX-101398962-T-G is described in ClinVar as Likely_benign. ClinVar VariationId is 2893330.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000169.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GLA	NM_000169.3	MANE Select	c.640-16A>C		intron	N/A	NP_000160.1
	GLA	NM_001406747.1		c.763-16A>C		intron	N/A	NP_001393676.1
	GLA	NM_001406748.1		c.640-16A>C		intron	N/A	NP_001393677.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GLA	ENST00000218516.4	TSL:1 MANE Select	c.640-16A>C		intron	N/A	ENSP00000218516.4
	RPL36A-HNRNPH2	ENST00000409170.3	TSL:4	c.300+3505T>G		intron	N/A	ENSP00000386655.4
	GLA	ENST00000675968.1		n.3278A>C		non_coding_transcript_exon	Exon 3 of 4

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 9.35e-7 AC: 1 AN: 1069251 Hom.: 0 Cov.: 28 AF XY: 0.00 AC XY: 0 AN XY: 338497

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 25845

American (AMR) AF: 0.00 AC: 0 AN: 35179

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 19191

East Asian (EAS) AF: 0.00 AC: 0 AN: 30096

South Asian (SAS) AF: 0.0000187 AC: 1 AN: 53412

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 40488

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 3018

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 816888

Other (OTH) AF: 0.00 AC: 0 AN: 45134

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 23

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Fabry disease Benign:1

Jan 14, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.90
CADD	Benign	0.056
DANN	Benign	0.41
PhyloP100		-0.65
BranchPoint Hunter		1.0

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

Other links and lift over

dbSNP: rs2071397; hg19: chrX-100653950;