rs1408044973

Variant names:

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1PM2PP5_Moderate

The NM_000478.6(ALPL):c.29T>C(p.Ile10Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000215 in 1,397,648 control chromosomes in the GnomAD database, with no homozygous occurrence. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

Frequency

Genomes: not found (cov: 31)

Exomes 𝑓: 0.0000021 ( 0 hom. )

Consequence

ALPL
NM_000478.6 missense

Scores

Clinical Significance

Likely pathogenic criteria provided, single submitter P:1

Conservation

PhyloP100: 1.96

Variant links:

Genes affected

ALPL (HGNC:438): (alkaline phosphatase, biomineralization associated) This gene encodes a member of the alkaline phosphatase family of proteins. There are at least four distinct but related alkaline phosphatases: intestinal, placental, placental-like, and liver/bone/kidney (tissue non-specific). The first three are located together on chromosome 2, while the tissue non-specific form is located on chromosome 1. The product of this gene is a membrane bound glycosylated enzyme that is not expressed in any particular tissue and is, therefore, referred to as the tissue-nonspecific form of the enzyme. Alternative splicing results in multiple transcript variants, at least one of which encodes a preproprotein that is proteolytically processed to generate the mature enzyme. This enzyme may play a role in bone mineralization. Mutations in this gene have been linked to hypophosphatasia, a disorder that is characterized by hypercalcemia and skeletal defects. [provided by RefSeq, Oct 2015]

ALPL links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

PM1

In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 6 uncertain in NM_000478.6

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 1-21554110-T-C is Pathogenic according to our data. Variant chr1-21554110-T-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 2573417.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr1-21554110-T-C is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ALPL	NM_000478.6 link	c.29T>C	p.Ile10Thr	missense_variant	Exon 2 of 12	ENST00000374840.8	NP_000469.3	P05186-1A0A024RAB4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ALPL	ENST00000374840.8 link	c.29T>C	p.Ile10Thr	missense_variant	Exon 2 of 12	1	NM_000478.6	ENSP00000363973.3		P05186-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.0000119

AC:

AN:

251484

Hom.:

AF XY:

0.0000221

AC XY:

AN XY:

135916

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000163

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000215

AC:

AN:

1397648

Hom.:

Cov.:

AF XY:

0.00000432

AC XY:

AN XY:

694524

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000866

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.:

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Hypophosphatasia

Pathogenic:1

Jun 06, 2023

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: ALPL c.29T>C (p.Ile10Thr) results in a non-conservative amino acid change in the encoded protein sequence. Three of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 1.2e-05 in 251484 control chromosomes (gnomAD). c.29T>C has been reported in the literature as a compound heterozygous genotype and at least once in the homozygous state in individuals affected with childhood/infantile-onset autosomal recessive Hypophosphatasia (e.g. Xu_2018, Mornet_2021). These data indicate that the variant may be associated with disease. A functional study examining the effect of the variant in vitro found that it results in 29% of WT activity but does not exhibit a dominant negative effect when expressed with the WT allele (del Angel_2020). The following publications have been ascertained in the context of this evaluation (PMID: 32160374, 32973344, 29724887). No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014. Based on the evidence outlined above, the variant was classified as likely pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.073

BayesDel_addAF

Benign

-0.12

BayesDel_noAF

Benign

-0.15

CADD

Benign

DANN

Uncertain

0.98

DEOGEN2

Benign

0.36

T;T

Eigen

Benign

-0.042

Eigen_PC

Benign

0.063

FATHMM_MKL

Benign

0.46

LIST_S2

Benign

0.71

.;T

M_CAP

Uncertain

0.28

MetaRNN

Uncertain

0.65

D;D

MetaSVM

Uncertain

0.31

MutationAssessor

Benign

0.81

L;L

PrimateAI

Benign

0.48

PROVEAN

Benign

-1.3

N;N

REVEL

Uncertain

0.31

Sift

Benign

0.033

D;D

Sift4G

Uncertain

0.010

D;D

Polyphen

0.24

B;B

Vest4

0.62

MutPred

0.53

Gain of helix (P = 0.0082);Gain of helix (P = 0.0082);

MVP

0.95

MPC

0.54

ClinPred

0.13

GERP RS

3.6

Varity_R

0.069

gMVP

0.64

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

Details are displayed if max score is > 0.2

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.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over