chrX-103776999-G-C

Position:

• chrX-103776999-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM1 PM2 PP3

The NM_000533.5(PLP1):​c.4G>C​(p.Gly2Arg) variant causes a missense, splice region change. 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 Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G2D) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 22)
• Consequence: PLP1 NM_000533.5 missense, splice_region
• Scores: Splicing: ADA: 0.9996
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.73

Genes affected

PLP1 (HGNC:9086): (proteolipid protein 1) This gene encodes a transmembrane proteolipid protein that is the predominant component of myelin. The encoded protein may play a role in the compaction, stabilization, and maintenance of myelin sheaths, as well as in oligodendrocyte development and axonal survival. Mutations in this gene cause Pelizaeus-Merzbacher disease and spastic paraplegia type 2. Alternatively splicing results in multiple transcript variants, including the DM20 splice variant. [provided by RefSeq, Feb 2015]

RAB9B (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM1: In a chain Myelin proteolipid protein (size 275) in uniprot entity MYPR_HUMAN there are 134 pathogenic changes around while only 5 benign (96%) in NM_000533.5
• 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.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PLP1	NM_000533.5	c.4G>C	p.Gly2Arg	missense_variant, splice_region_variant	1/7	ENST00000621218.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PLP1	ENST00000621218.5	c.4G>C	p.Gly2Arg	missense_variant, splice_region_variant	1/7	1	NM_000533.5	P1

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Cov.: 27

GnomAD4 genome Cov.: 22

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Jan 17, 2023

Not observed at significant frequency in large population cohorts (gnomAD); Missense variants in this gene are often considered pathogenic (HGMD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.74
BayesDel_addAF	Pathogenic	0.68	D
BayesDel_noAF	Pathogenic	0.73
CADD	Pathogenic	34
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.17	T;T;T;T;T;D;T;D;.
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.88	D;.;D;D;D;D;D;.;D
M_CAP	Pathogenic	0.95	D
MetaRNN	Pathogenic	0.97	D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	1.0	D
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Pathogenic	0.90	D
PROVEAN	Pathogenic	-6.1	D;.;D;D;D;.;D;.;.
REVEL	Pathogenic	0.94
Sift	Pathogenic	0.0	D;.;D;D;D;.;D;.;.
Sift4G	Pathogenic	0.0	D;D;D;D;D;D;D;D;D
Polyphen		1.0, 1.0	.;.;.;.;.;D;.;D;D
Vest4		0.88, 0.74
MutPred		0.81		Gain of solvent accessibility (P = 0.019);Gain of solvent accessibility (P = 0.019);Gain of solvent accessibility (P = 0.019);Gain of solvent accessibility (P = 0.019);Gain of solvent accessibility (P = 0.019);Gain of solvent accessibility (P = 0.019);Gain of solvent accessibility (P = 0.019);Gain of solvent accessibility (P = 0.019);Gain of solvent accessibility (P = 0.019);
MVP		1.0
ClinPred		1.0	D
GERP RS		5.4
Varity_R		0.94
gMVP		0.95

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.95
SpliceAI score (max)		0.030		Details are displayed if max score is > 0.2

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chrX-103031927;