rs121918004
Positions:
Variant summary
Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM1PP3_StrongPP5
The NM_000478.6(ALPL):āc.620A>Cā(p.Gln207Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000041 in 1,461,712 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).
Frequency
Genomes: not found (cov: 32)
Exomes š: 0.0000041 ( 0 hom. )
Consequence
ALPL
NM_000478.6 missense
NM_000478.6 missense
Scores
13
4
1
Clinical Significance
Conservation
PhyloP100: 8.83
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]
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ACMG classification
Classification made for transcript
Verdict is Likely_pathogenic. Variant got 7 ACMG points.
PM1
?
In a hotspot region, there are 5 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 8 uncertain in NM_000478.6
PP3
?
MetaRNN computational evidence supports a deleterious effect, 0.991
PP5
?
Variant 1-21564188-A-C is Pathogenic according to our data. Variant chr1-21564188-A-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 13666.We mark this variant Likely_pathogenic, oryginal submissions are: {Pathogenic=2, Uncertain_significance=1, Likely_pathogenic=1}. Variant chr1-21564188-A-C is described in Lovd as [Pathogenic].
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
ALPL | NM_000478.6 | c.620A>C | p.Gln207Pro | missense_variant | 6/12 | ENST00000374840.8 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
ALPL | ENST00000374840.8 | c.620A>C | p.Gln207Pro | missense_variant | 6/12 | 1 | NM_000478.6 | P1 |
Frequencies
GnomAD3 genomes ? Cov.: 32
GnomAD3 genomes
?
Cov.:
32
GnomAD4 exome AF: 0.00000410 AC: 6AN: 1461712Hom.: 0 Cov.: 32 AF XY: 0.00000550 AC XY: 4AN XY: 727162
GnomAD4 exome
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6
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1461712
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32
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4
AN XY:
727162
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GnomAD4 genome ? Cov.: 32
GnomAD4 genome
?
Cov.:
32
ClinVar
Significance: Conflicting classifications of pathogenicity
Submissions summary: Pathogenic:4Uncertain:1
Revision: criteria provided, conflicting classifications
LINK: link
Submissions by phenotype
Infantile hypophosphatasia Pathogenic:2
Pathogenic, no assertion criteria provided | literature only | OMIM | Oct 15, 1992 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Neuberg Centre For Genomic Medicine, NCGM | - | The missense variant p.Q207P in ALPL (NM_000478.6) ha been previously reported with autosomal recessive infantile hypophosphatasia (Henthron P et al). It has been submitted to ClinVar as Pathogenic. The p.Q207P variant is novel (not in any individuals) in gnomAD Exomes and is novel (not in any individuals) in 1000 Genomes. The p.Q207P missense variant is predicted to be damaging by both SIFT and PolyPhen2. The glutamine residue at codon 207 of ALPL is conserved in all mammalian species. The nucleotide c.620 in ALPL is predicted conserved by GERP++ and PhyloP across 100 vertebrates - |
not provided Pathogenic:2
Pathogenic, criteria provided, single submitter | clinical testing | Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics | May 06, 2016 | - - |
Likely pathogenic, criteria provided, single submitter | clinical testing | Invitae | Aug 14, 2023 | In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. This variant disrupts the p.Gln207 amino acid residue in ALPL. Other variant(s) that disrupt this residue have been observed in individuals with ALPL-related conditions (PMID: 32066479), which suggests that this may be a clinically significant amino acid residue. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt ALPL protein function. ClinVar contains an entry for this variant (Variation ID: 13666). This variant is also known as p.Gln190Pro. This missense change has been observed in individual(s) with clinical features of hypophosphatasia (PMID: 1409720; Invitae). This variant is not present in population databases (gnomAD no frequency). This sequence change replaces glutamine, which is neutral and polar, with proline, which is neutral and non-polar, at codon 207 of the ALPL protein (p.Gln207Pro). - |
not specified Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Women's Health and Genetics/Laboratory Corporation of America, LabCorp | Apr 26, 2023 | Variant summary: ALPL c.620A>C (p.Gln207Pro) results in a non-conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant was absent in 251116 control chromosomes. c.620A>C has been reported in the literature in a compound heterozygous individual affected with Perinatal Hypophosphatasia, Autosomal Recessive (Henthorn_1992) carrying an additional variant scored as VUS-possibly pathogenic by our lab. This patient had enzyme activity of <10% in fibroblasts (Fedde_1996). The following publications have been ascertained in the context of this evaluation (PMID: 8675582, 1409720). Four clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation, classifying the variant as pathogenic (n=3) or likely pathogenic (n=1). Based on the evidence outlined above, the variant was classified as VUS-possibly pathogenic. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Pathogenic
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
CADD
Pathogenic
DANN
Uncertain
DEOGEN2
Pathogenic
D;.;.;D
Eigen
Pathogenic
Eigen_PC
Pathogenic
FATHMM_MKL
Pathogenic
D
M_CAP
Pathogenic
D
MetaRNN
Pathogenic
D;D;D;D
MetaSVM
Pathogenic
D
MutationAssessor
Pathogenic
H;.;.;H
MutationTaster
Benign
A;A;A;A;A
PrimateAI
Uncertain
T
PROVEAN
Pathogenic
D;D;D;D
REVEL
Pathogenic
Sift
Uncertain
D;D;D;D
Sift4G
Uncertain
D;D;D;D
Polyphen
B;.;.;B
Vest4
MutPred
Loss of catalytic residue at Q207 (P = 0.027);.;.;Loss of catalytic residue at Q207 (P = 0.027);
MVP
MPC
ClinPred
D
GERP RS
Varity_R
gMVP
Splicing
Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at