Genetic Variant NM_001032382.2:c.731C>G (chrX-48903017-C-G) – ACMG Classification: Likely_pathogenic (6 pts)

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2PM5PP3_Moderate

The NM_001032382.2(PQBP1):c.731C>G(p.Pro244Arg) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic 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. P244L) has been classified as Likely pathogenic.

Frequency

Genomes: not found (cov: 22)

Consequence

PQBP1
NM_001032382.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 6.89

Publications

0 publications found

Variant links:

Genes affected

PQBP1 (HGNC:9330): (polyglutamine binding protein 1) This gene encodes a nuclear polyglutamine-binding protein that is involved with transcription activation. The encoded protein contains a WW domain. Mutations in this gene have been found in patients with Renpenning syndrome 1 and other syndromes with X-linked cognitive disability. Multiple alternatively spliced transcript variants that encode different protein isoforms have been described for this gene.[provided by RefSeq, Nov 2009]

PQBP1 links:

SLC35A2 (HGNC:11022): (solute carrier family 35 member A2) This gene encodes a member of the nucleotide-sugar transporter family. The encoded protein is a multi-pass membrane protein. It transports UDP-galactose from the cytosol into Golgi vesicles, where it serves as a glycosyl donor for the generation of glycans. Mutations in this gene cause congenital disorder of glycosylation type IIm (CDG2M). Multiple alternatively spliced transcript variants encoding distinct isoforms have been found for this gene. [provided by RefSeq, Oct 2014]

SLC35A2 Gene-Disease associations (from GenCC):

SLC35A2-congenital disorder of glycosylation
Inheritance: XL, Unknown Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Illumina, Orphanet, G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
X-linked complex neurodevelopmental disorder
Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen

SLC35A2 links:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chrX-48903017-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 235848.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.921

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PQBP1	NM_001032382.2 link	c.731C>G	p.Pro244Arg	missense_variant	Exon 7 of 7	ENST00000447146.7	NP_001027554.1
SLC35A2	NM_005660.3 link	c.*421G>C		downstream_gene_variant		ENST00000247138.11	NP_005651.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PQBP1	ENST00000447146.7 link	c.731C>G	p.Pro244Arg	missense_variant	Exon 7 of 7	1	NM_001032382.2	ENSP00000391759.2
SLC35A2	ENST00000247138.11 link	c.*421G>C		downstream_gene_variant		1	NM_005660.3	ENSP00000247138.5

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

not provided

Uncertain:1

Aug 27, 2022

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); 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

1.0

BayesDel_addAF

Pathogenic

0.59

BayesDel_noAF

Pathogenic

0.60

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.67

.;D;D;.;D;D

FATHMM_MKL

Uncertain

0.97

LIST_S2

Pathogenic

0.98

D;D;.;.;.;.

M_CAP

Pathogenic

0.89

MetaRNN

Pathogenic

0.92

D;D;D;D;D;D

MetaSVM

Benign

-0.35

MutationAssessor

Benign

1.6

.;L;L;.;L;L

PhyloP100

6.9

PrimateAI

Pathogenic

0.88

PROVEAN

Pathogenic

-8.0

D;D;D;D;D;D

REVEL

Pathogenic

0.71

Sift

Pathogenic

0.0

D;D;D;D;D;D

Sift4G

Pathogenic

0.0

D;D;D;D;D;D

Polyphen

1.0

D;D;D;D;D;D

Vest4

0.89

MutPred

0.23

.;Gain of MoRF binding (P = 0.0141);Gain of MoRF binding (P = 0.0141);.;Gain of MoRF binding (P = 0.0141);Gain of MoRF binding (P = 0.0141);

MVP

1.0

MPC

1.9

ClinPred

1.0

GERP RS

5.3

Varity_R

0.93

Mutation Taster

=52/48

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

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