rs1555332361
Positions:
Variant summary
Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PVS1PM2PP3_StrongPP5_Moderate
The NM_007129.5(ZIC2):c.1076-2A>T variant causes a splice acceptor change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★).
Frequency
Genomes: not found (cov: 32)
Consequence
ZIC2
NM_007129.5 splice_acceptor
NM_007129.5 splice_acceptor
Scores
3
3
1
Splicing: ADA: 1.000
2
Clinical Significance
Conservation
PhyloP100: 9.26
Genes affected
ZIC2 (HGNC:12873): (Zic family member 2) This gene encodes a member of the ZIC family of C2H2-type zinc finger proteins. This protein functions as a transcriptional repressor and may regulate tissue specific expression of dopamine receptor D1. Expansion of an alanine repeat in the C-terminus of the encoded protein and other mutations in this gene cause holoprosencephaly type 5. Holoprosencephaly is the most common structural anomaly of the human brain. A polyhistidine tract polymorphism in this gene may be associated with increased risk of neural tube defects. This gene is closely linked to a gene encoding zinc finger protein of the cerebellum 5, a related family member on chromosome 13. [provided by RefSeq, Jul 2016]
Genome browser will be placed here
ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 16 ACMG points.
PVS1
?
Splicing variant, LoF is a know mechanism of disease, Cryptic splice site detected, with MaxEntScore 5.6, offset of -26, new splice context is: caggctctgggtgtctgcAGcca. Cryptic site results in frameshift change. If cryptic site found is not functional and variant results in exon loss, it results in frameshift change.
PM2
?
Very rare variant in population databases, with high coverage;
PP3
?
Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF, max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.
PP5
?
Variant 13-99984944-A-T is Pathogenic according to our data. Variant chr13-99984944-A-T is described in ClinVar as [Pathogenic]. Clinvar id is 468364.Status of the report is criteria_provided_single_submitter, 1 stars.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
ZIC2 | NM_007129.5 | c.1076-2A>T | splice_acceptor_variant | ENST00000376335.8 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
ZIC2 | ENST00000376335.8 | c.1076-2A>T | splice_acceptor_variant | 1 | NM_007129.5 | P1 | |||
ZIC2 | ENST00000477213.1 | n.156A>T | non_coding_transcript_exon_variant | 1/2 | 2 | ||||
ZIC2 | ENST00000468291.1 | n.50-2A>T | splice_acceptor_variant, non_coding_transcript_variant | 2 | |||||
ZIC2 | ENST00000490085.5 | n.122-2A>T | splice_acceptor_variant, non_coding_transcript_variant | 3 |
Frequencies
GnomAD3 genomes ? Cov.: 32
GnomAD3 genomes
?
Cov.:
32
GnomAD4 exome Cov.: 33
GnomAD4 exome
Cov.:
33
GnomAD4 genome ? Cov.: 32
GnomAD4 genome
?
Cov.:
32
ClinVar
Significance: Pathogenic
Submissions summary: Pathogenic:1
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
Holoprosencephaly 5 Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Invitae | Sep 16, 2016 | This sequence change affects an acceptor splice site in intron 1 of the ZIC2 gene. It is expected to disrupt mRNA splicing and likely results in an absent or disrupted protein product. This variant has not been reported in the literature in an individual with a ZIC2-related disease.  However, a sequence change at an adjacent nucleotide that affects the same intron 1 acceptor splice site (c.1076-1G>A) has been reported in three individuals affected with holoprosencephaly (PMID: 19177455). Family studies have indicated that this variant was not present in the parents of an individual with holoprosencephaly, which suggests that it was de novo in that affected individual. For these reasons, this variant has been classified as Pathogenic. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Uncertain
CADD
Pathogenic
DANN
Uncertain
Eigen
Pathogenic
Eigen_PC
Pathogenic
FATHMM_MKL
Uncertain
D
MutationTaster
Benign
D
GERP RS
Splicing
Name
Calibrated prediction
Score
Prediction
dbscSNV1_ADA
Pathogenic
dbscSNV1_RF
Pathogenic
SpliceAI score (max)
Details are displayed if max score is > 0.2
DS_AG_spliceai
Position offset: -24
DS_AL_spliceai
Position offset: 2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at