1-23795993-G-C

Variant names:

• chr1-23795993-G-C
• rs368420588
• NM_001008216.2:c.1003C>G

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PM5 PP3

The NM_001008216.2(GALE):​c.1003C>G​(p.Arg335Gly) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,690 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R335H) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: GALE NM_001008216.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 4.17

Genes affected

GALE (HGNC:4116): (UDP-galactose-4-epimerase) This gene encodes UDP-galactose-4-epimerase which catalyzes two distinct but analogous reactions: the epimerization of UDP-glucose to UDP-galactose, and the epimerization of UDP-N-acetylglucosamine to UDP-N-acetylgalactosamine. The bifunctional nature of the enzyme has the important metabolic consequence that mutant cells (or individuals) are dependent not only on exogenous galactose, but also on exogenous N-acetylgalactosamine as a necessary precursor for the synthesis of glycoproteins and glycolipids. Mutations in this gene result in epimerase-deficiency galactosemia, also referred to as galactosemia type 3, a disease characterized by liver damage, early-onset cataracts, deafness and cognitive disability, with symptoms ranging from mild ('peripheral' form) to severe ('generalized' form). Multiple alternatively spliced transcripts encoding the same protein have been identified. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr1-23795992-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 2503917.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.836

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GALE	NM_001008216.2	c.1003C>G	p.Arg335Gly	missense_variant	Exon 12 of 12	ENST00000617979.5	NP_001008217.1
GALE	NM_000403.4	c.1003C>G	p.Arg335Gly	missense_variant	Exon 12 of 12		NP_000394.2
GALE	NM_001127621.2	c.1003C>G	p.Arg335Gly	missense_variant	Exon 11 of 11		NP_001121093.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GALE	ENST00000617979.5	c.1003C>G	p.Arg335Gly	missense_variant	Exon 12 of 12	1	NM_001008216.2	ENSP00000483375.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461690 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727134

Gnomad4 AFR exome AF: 0.0000299

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000756

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.26
BayesDel_addAF	Pathogenic	0.42	D
BayesDel_noAF	Pathogenic	0.36
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.71	D;D;T
Eigen	Pathogenic	0.76
Eigen_PC	Pathogenic	0.68
FATHMM_MKL	Uncertain	0.81	D
LIST_S2	Pathogenic	0.99	D;.;D
M_CAP	Pathogenic	0.32	D
MetaRNN	Pathogenic	0.84	D;D;D
MetaSVM	Pathogenic	0.88	D
MutationAssessor	Uncertain	2.8	M;M;.
PrimateAI	Uncertain	0.52	T
PROVEAN	Pathogenic	-4.5	.;D;D
REVEL	Pathogenic	0.86
Sift	Uncertain	0.0050	.;D;D
Sift4G	Uncertain	0.0020	D;D;D
Polyphen		1.0	D;D;.
Vest4		0.35
MutPred		0.65		Loss of MoRF binding (P = 0.0053);Loss of MoRF binding (P = 0.0053);.;
MVP		0.94
MPC		0.66
ClinPred		0.99	D
GERP RS		4.9
Varity_R		0.86
gMVP		0.81

Splicing

Name	Calibrated prediction	Score	Prediction
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: rs368420588; hg19: chr1-24122483;