X-30668120-T-C

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PVS1_ModeratePM2PP5_Moderate

The NM_001205019.2(GK):​c.259+2T>C variant causes a splice donor, intron 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 Pathogenic (★).

Frequency

Genomes: not found (cov: 24)
Exomes 𝑓: 0.0 ( 0 hom. 0 hem. )
Failed GnomAD Quality Control

Consequence

GK
NM_001205019.2 splice_donor, intron

Scores

2
2
1
Splicing: ADA: 0.9867
1
1

Clinical Significance

Pathogenic criteria provided, single submitter P:1

Conservation

PhyloP100: 7.61
Variant links:
Genes affected
GK (HGNC:4289): (glycerol kinase) The protein encoded by this gene belongs to the FGGY kinase family. This protein is a key enzyme in the regulation of glycerol uptake and metabolism. It catalyzes the phosphorylation of glycerol by ATP, yielding ADP and glycerol-3-phosphate. Mutations in this gene are associated with glycerol kinase deficiency (GKD). Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Mar 2011]

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

PVS1
Splicing +-2 bp (donor or acceptor) variant, product NOT destroyed by NMD, known LOF gene, truncates exone, which is 0.063690476 fraction of the gene. Cryptic splice site detected, with MaxEntScore 3.7, offset of -45, new splice context is: catGTgaga. Cryptic site results in inframe change. If cryptic site found is not functional and variant results in exon loss, it results in frameshift change.
PM2
Very rare variant in population databases, with high coverage;
PP5
Variant X-30668120-T-C is Pathogenic according to our data. Variant chrX-30668120-T-C is described in ClinVar as [Pathogenic]. Clinvar id is 379913.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene Transcript HGVSc HGVSp Effect Exon rank MANE Protein UniProt
GKNM_001205019.2 linkc.259+2T>C splice_donor_variant, intron_variant Intron 3 of 20 ENST00000427190.6 NP_001191948.1 P32189-3B4DH54

Ensembl

Gene Transcript HGVSc HGVSp Effect Exon rank TSL MANE Protein Appris UniProt
GKENST00000427190.6 linkc.259+2T>C splice_donor_variant, intron_variant Intron 3 of 20 5 NM_001205019.2 ENSP00000401720.2 P32189-3

Frequencies

GnomAD3 genomes
Cov.:
24
GnomAD4 exome
Data not reliable, filtered out with message: AC0;AS_VQSR
AF:
0.00
AC:
0
AN:
803746
Hom.:
0
Cov.:
15
AF XY:
0.00
AC XY:
0
AN XY:
222024
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:
0.00
Gnomad4 OTH exome
AF:
0.00
GnomAD4 genome
Cov.:
24

ClinVar

Significance: Pathogenic
Submissions summary: Pathogenic:1
Revision: criteria provided, single submitter
LINK: link

Submissions by phenotype

not provided Pathogenic:1
Jun 02, 2015
GeneDx
Significance: Pathogenic
Review Status: criteria provided, single submitter
Collection Method: clinical testing

The c.259+2 T>C splice site variant in the GK gene destroys the canonical splice donor site in intron 3. It is predicted to cause abnormal gene splicing, either leading to an abnormal message that is subject to nonsense-mediated mRNA decay, or to an abnormal protein product if the message is used for protein translation. Although this variant has not been previously reported to our knowledge, we interpret it as pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Pathogenic
0.74
D
BayesDel_noAF
Pathogenic
0.22
CADD
Pathogenic
26
DANN
Uncertain
0.99
FATHMM_MKL
Uncertain
0.96
D
GERP RS
5.6

Splicing

Name
Calibrated prediction
Score
Prediction
dbscSNV1_ADA
Pathogenic
0.99
dbscSNV1_RF
Benign
0.60
SpliceAI score (max)
0.89
Details are displayed if max score is > 0.2
DS_DL_spliceai
0.89
Position offset: -2

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Other links and lift over

dbSNP: rs1057520781; hg19: chrX-30686237; API