X-71537917-G-C

Variant names:

• chrX-71537917-G-C
• NM_181672.3:c.307G>C
• OGT p.Gly103Arg

Variant summary

Our verdict is Likely pathogenic. The variant received 7 ACMG points: 7P and 0B. PS1_Moderate PM2 PP2 PP3_Moderate

The NM_181672.3(OGT):​c.307G>C​(p.Gly103Arg) variant causes a missense 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. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Likely pathogenic in ClinVar. Synonymous variant affecting the same amino acid position (i.e. G103G) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 23)
• Consequence: OGT NM_181672.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 9.62
• Publications: 0 publications found

Genes affected

OGT (HGNC:8127): (O-linked N-acetylglucosamine (GlcNAc) transferase) This gene encodes a glycosyltransferase that catalyzes the addition of a single N-acetylglucosamine in O-glycosidic linkage to serine or threonine residues. Since both phosphorylation and glycosylation compete for similar serine or threonine residues, the two processes may compete for sites, or they may alter the substrate specificity of nearby sites by steric or electrostatic effects. The protein contains multiple tetratricopeptide repeats that are required for optimal recognition of substrates. Alternatively spliced transcript variants encoding distinct isoforms have been found for this gene. [provided by RefSeq, Oct 2009]

OGT Gene-Disease associations (from GenCC):

• intellectual disability, X-linked 106

  Inheritance: XL Classification: STRONG, MODERATE Submitted by: G2P, Illumina, ClinGen, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Likely_pathogenic. The variant received 7 ACMG points.

• PS1: Transcript NM_181672.3 (OGT) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in ClinVar.
• 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 12 curated pathogenic missense variants (we use a threshold of 10). The gene has 3 curated benign missense variants. Gene score misZ: 5.6667 (above the threshold of 3.09). Trascript score misZ: NaN (below the threshold of 3.09). GenCC associations: The gene is linked to intellectual disability, X-linked 106.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.876

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_181672.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	OGT	NM_181672.3	MANE Select	c.307G>C	p.Gly103Arg	missense	Exon 3 of 22	NP_858058.1	O15294-1
	OGT	NM_181673.3		c.277G>C	p.Gly93Arg	missense	Exon 3 of 22	NP_858059.1	O15294-3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	OGT	ENST00000373719.8	TSL:1 MANE Select	c.307G>C	p.Gly103Arg	missense	Exon 3 of 22	ENSP00000362824.3	O15294-1
	OGT	ENST00000373701.7	TSL:1	c.277G>C	p.Gly93Arg	missense	Exon 3 of 22	ENSP00000362805.3	O15294-3
	OGT	ENST00000925317.1		c.307G>C	p.Gly103Arg	missense	Exon 3 of 22	ENSP00000595376.1

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 23

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.83
BayesDel_addAF	Uncertain	0.13	D
BayesDel_noAF	Uncertain	-0.050
CADD	Pathogenic	31
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.78	D
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Pathogenic	0.46	D
MetaRNN	Pathogenic	0.88	D
MetaSVM	Uncertain	-0.16	T
MutationAssessor	Uncertain	2.2	M
PhyloP100		9.6
PrimateAI	Pathogenic	0.92	D
PROVEAN	Pathogenic	-5.7	D
REVEL	Uncertain	0.49
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.0020	D
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.95
gMVP		0.95
Mutation Taster		=15/85	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		Details are displayed if max score is > 0.2

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chrX-70757767;