14-87988523-C-T

Position:

• chr14-87988523-C-T

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM1 PM2 PP3 PP5_Moderate

The NM_000153.4(GALC):​c.196G>A​(p.Ala66Thr) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. A66A) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: GALC NM_000153.4 missense, splice_region
• Scores: Splicing: ADA: 0.9995
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 7.31

Genes affected

GALC (HGNC:4115): (galactosylceramidase) This gene encodes a lysosomal protein which hydrolyzes the galactose ester bonds of galactosylceramide, galactosylsphingosine, lactosylceramide, and monogalactosyldiglyceride. Mutations in this gene have been associated with Krabbe disease, also known as globoid cell leukodystrophy. Alternate transcriptional splice variants, encoding different isoforms, have been characterized. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_pathogenic. Variant got 7 ACMG points.

• PM1: In a hotspot region, there are 5 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 4 uncertain in NM_000153.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. No scorers claiming Uncertain. Scorers claiming Benign: max_spliceai.
• PP5: Variant 14-87988523-C-T is Pathogenic according to our data. Variant chr14-87988523-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 374023.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr14-87988523-C-T is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GALC	NM_000153.4	c.196G>A	p.Ala66Thr	missense_variant, splice_region_variant	2/17	ENST00000261304.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GALC	ENST00000261304.7	c.196G>A	p.Ala66Thr	missense_variant, splice_region_variant	2/17	1	NM_000153.4	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Amblyopia;C0006157:Breech presentation;C0015934:Fetal growth restriction;C0018989:Hemiparesis;C0023520:Leukodystrophy;C0028738:Nystagmus;C0036572:Seizure;C0038220:Status epilepticus;C0038379:Strabismus;C0151611:EEG abnormality;C0158986:Neonatal hypoglycemia;C0235991:Small for gestational age;C0476403:EMG abnormality;C0557874:Global developmental delay;C1836830:Developmental regression;C1836843:Loss of ambulation;C1839364:Progressive visual loss;C3278204:Dysmyelinating leukodystrophy;C4025609:EMG: axonal abnormality Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Centre for Mendelian Genomics, University Medical Centre Ljubljana

Oct 28, 2015

- -

Galactosylceramide beta-galactosidase deficiency Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Centre for Mendelian Genomics, University Medical Centre Ljubljana

Jan 01, 2016

This variant was classified as: Likely pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.85
BayesDel_addAF	Pathogenic	0.35	D
BayesDel_noAF	Pathogenic	0.27
CADD	Pathogenic	33
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.82	D;.;.
Eigen	Pathogenic	0.94
Eigen_PC	Pathogenic	0.89
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.95	D;T;T
M_CAP	Pathogenic	0.56	D
MetaRNN	Pathogenic	0.92	D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.1	M;.;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.73	T
PROVEAN	Uncertain	-3.4	D;D;D
REVEL	Pathogenic	0.88
Sift	Uncertain	0.0050	D;D;D
Sift4G	Uncertain	0.0050	D;D;D
Polyphen		1.0	D;D;D
Vest4		0.94
MutPred		0.67		Gain of catalytic residue at G65 (P = 0);.;.;
MVP		0.99
MPC		0.54
ClinPred		0.99	D
GERP RS		5.7
Varity_R		0.53
gMVP		0.92

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.94
SpliceAI score (max)		0.020		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: rs1057518843; hg19: chr14-88454867;