Genetic Variant MPI:p.Ala3Pro (chr15-74890080-G-C) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_002435.3(MPI):c.7G>C(p.Ala3Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000687 in 1,455,404 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/22 in silico tools predict a benign 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. A3T) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

MPI
NM_002435.3 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.169

Publications

1 publications found

Variant links:

Genes affected

MPI (HGNC:7216): (mannose phosphate isomerase) Phosphomannose isomerase catalyzes the interconversion of fructose-6-phosphate and mannose-6-phosphate and plays a critical role in maintaining the supply of D-mannose derivatives, which are required for most glycosylation reactions. Mutations in the MPI gene were found in patients with carbohydrate-deficient glycoprotein syndrome, type Ib. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jan 2014]

MPI Gene-Disease associations (from GenCC):

MPI-congenital disorder of glycosylation
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, PanelApp Australia, Myriad Women’s Health, G2P, ClinGen

MPI links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.09970856).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002435.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
MPI	NM_002435.3	MANE Select	c.7G>C	p.Ala3Pro	missense	Exon 1 of 8	NP_002426.1
MPI	NM_001289157.2		c.7G>C	p.Ala3Pro	missense	Exon 1 of 7	NP_001276086.1
MPI	NM_001289155.2		c.7G>C	p.Ala3Pro	missense	Exon 1 of 7	NP_001276084.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
MPI	ENST00000352410.9	TSL:1 MANE Select	c.7G>C	p.Ala3Pro	missense	Exon 1 of 8	ENSP00000318318.6
MPI	ENST00000323744.10	TSL:1	c.7G>C	p.Ala3Pro	missense	Exon 1 of 7	ENSP00000318192.6
MPI	ENST00000563422.5	TSL:1	c.7G>C	p.Ala3Pro	missense	Exon 1 of 6	ENSP00000457885.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000408

AC:

AN:

244906

AF XY:

0.00

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000887

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

6.87e-7

AC:

AN:

1455404

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

724368

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33466

American (AMR)

AF:

0.00

AC:

AN:

44714

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26122

East Asian (EAS)

AF:

0.00

AC:

AN:

39696

South Asian (SAS)

AF:

0.00

AC:

AN:

86232

European-Finnish (FIN)

AF:

0.00

AC:

AN:

47294

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5614

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1111928

Other (OTH)

AF:

0.00

AC:

AN:

60338

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

EpiCase

AF:

0.000109

EpiControl

AF:

0.0000593

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.11

BayesDel_addAF

Uncertain

0.13

BayesDel_noAF

Uncertain

-0.050

CADD

Benign

(source)

DANN

Benign

0.76

DEOGEN2

Uncertain

0.49

Eigen

Benign

-1.3

Eigen_PC

Benign

-1.3

FATHMM_MKL

Benign

0.11

LIST_S2

Benign

0.75

M_CAP

Benign

0.035

MetaRNN

Benign

0.10

MetaSVM

Uncertain

0.092

MutationAssessor

Benign

0.90

PhyloP100

0.17

PrimateAI

Benign

0.42

PROVEAN

Benign

-0.96

REVEL

Uncertain

0.46

Sift

Benign

0.32

Sift4G

Benign

0.30

Polyphen

0.64

Vest4

0.24

MutPred

0.37

Gain of catalytic residue at A3 (P = 0.0055)

MVP

0.42

MPC

0.24

ClinPred

0.31

GERP RS

-3.8

PromoterAI

-0.70

Under-expression

(source)

Varity_R

0.17

gMVP

0.36

Mutation Taster

=96/4

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over