Genetic Variant GALC:p.Ser450Arg (chr14-87947867-G-C) – ACMG Classification: Uncertain_significance (1 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 3P and 2B. PM2PP2BP4_Moderate

The NM_000153.4(GALC):c.1350C>G(p.Ser450Arg) variant causes a missense 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. 14/22 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. S450G) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 31)

Consequence

GALC
NM_000153.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.109

Publications

0 publications found

Variant links:

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]

GALC Gene-Disease associations (from GenCC):

Krabbe disease
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Myriad Women’s Health, Laboratory for Molecular Medicine, Labcorp Genetics (formerly Invitae), PanelApp Australia, ClinGen, Genomics England PanelApp

GALC links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP2

Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 94 curated pathogenic missense variants (we use a threshold of 10). The gene has 16 curated benign missense variants. Gene score misZ: 0.18582 (below the threshold of 3.09). Trascript score misZ: -0.28853 (below the threshold of 3.09). GenCC associations: The gene is linked to Krabbe disease.

BP4

Computational evidence support a benign effect (MetaRNN=0.108445674).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GALC	NM_000153.4 link	c.1350C>G	p.Ser450Arg	missense_variant	Exon 13 of 17	ENST00000261304.7	NP_000144.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GALC	ENST00000261304.7 link	c.1350C>G	p.Ser450Arg	missense_variant	Exon 13 of 17	1	NM_000153.4	ENSP00000261304.2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

Cov.:

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Galactosylceramide beta-galactosidase deficiency

Uncertain:1

Dec 28, 2022

Foundation for Research in Genetics and Endocrinology, FRIGE's Institute of Human Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

A Homozygous missense variation in exon 13 of the GALC gene that results in the amino acid substitution of Arginine for Serine at codon 450 was detected. The observed variant c.1350C>G (p.Ser450Arg) has not been reported in the 1000 genomes and ExAC databases. The in silico prediction of the variant are possibly damaging by PolyPhen-2 (HumDiv) and damaging by LRT and MutationTaster2. The reference codon is conserved across species. In summary, the variant meets our criteria to be classified as a variant of uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.13

BayesDel_addAF

Uncertain

0.024

BayesDel_noAF

Benign

-0.20

CADD

Benign

6.4

(source)

DANN

Benign

0.95

DEOGEN2

Uncertain

0.64

D;.;.;.

Eigen

Benign

-1.1

Eigen_PC

Benign

-1.2

FATHMM_MKL

Benign

0.033

LIST_S2

Benign

0.84

T;T;T;T

M_CAP

Uncertain

0.12

MetaRNN

Benign

0.11

T;T;T;T

MetaSVM

Uncertain

-0.28

MutationAssessor

Uncertain

2.1

M;.;.;.

PhyloP100

-0.11

PrimateAI

Benign

0.30

PROVEAN

Benign

-1.7

N;N;N;N

REVEL

Benign

0.23

Sift

Benign

0.10

T;T;T;T

Sift4G

Benign

0.17

T;T;T;T

Polyphen

0.0020

B;B;B;.

Vest4

0.10

MutPred

0.42

Gain of solvent accessibility (P = 4e-04);.;.;.;

MVP

0.79

MPC

0.20

ClinPred

0.038

GERP RS

-2.8

Varity_R

0.067

gMVP

0.65

Mutation Taster

=88/12

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over