rs886039777

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The ENST00000356577.10(SON):​c.286C>T​(p.Gln96Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. 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 Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: not found (cov: 33)

Consequence

SON
ENST00000356577.10 stop_gained

Scores

4
2
1

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3

Conservation

PhyloP100: 2.87
Variant links:
Genes affected
SON (HGNC:11183): (SON DNA and RNA binding protein) This gene encodes a protein that contains multiple simple repeats. The encoded protein binds RNA and promotes pre-mRNA splicing, particularly of transcripts with poor splice sites. The protein also recognizes a specific DNA sequence found in the human hepatitis B virus (HBV) and represses HBV core promoter activity. There is a pseudogene for this gene on chromosome 1. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2013]

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ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 18 ACMG points.

PVS1
Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
PM2
Very rare variant in population databases, with high coverage;
PP5
Variant 21-33549517-C-T is Pathogenic according to our data. Variant chr21-33549517-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 252926.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr21-33549517-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene Transcript HGVSc HGVSp Effect #exon/exons MANE Protein UniProt
SONNM_138927.4 linkuse as main transcriptc.286C>T p.Gln96Ter stop_gained 3/12 ENST00000356577.10 NP_620305.3

Ensembl

Gene Transcript HGVSc HGVSp Effect #exon/exons TSL MANE Protein Appris UniProt
SONENST00000356577.10 linkuse as main transcriptc.286C>T p.Gln96Ter stop_gained 3/121 NM_138927.4 ENSP00000348984 P3P18583-1

Frequencies

GnomAD3 genomes
Cov.:
33
GnomAD4 exome
Cov.:
30
GnomAD4 genome
Cov.:
33

ClinVar

Significance: Pathogenic/Likely pathogenic
Submissions summary: Pathogenic:3
Revision: criteria provided, multiple submitters, no conflicts
LINK: link

Submissions by phenotype

ZTTK syndrome Pathogenic:2
Pathogenic, criteria provided, single submittercurationBroad Center for Mendelian Genomics, Broad Institute of MIT and HarvardMay 02, 2023The heterozygous p.Gln96Ter variant in SON was identified by our study in one individual with hypoplasia of the corpus callosum and global developmental delay. Trio exome analysis showed this variant to be de novo. The p.Gln96Ter has been previously reported in one individual with ZTTK syndrome (PMID: 27545676) and was found to be de novo in this individual with confirmed paternity and maternity. The number of reported affected individuals with this variant is slightly greater than expected compared to non-affected individuals with this variant. This variant has also been reported in ClinVar (Variation ID: 252926) and has been interpreted as pathogenic by OMIM and as likely pathogenic by Baylor Genetics. This variant was absent from large population studies. This nonsense variant leads to a premature termination codon at position 96, which is predicted to lead to a truncated or absent protein. Heterozygous loss of function of the SON gene is an established disease mechanism in autosomal dominant ZTTK syndrome. In summary, this variant meets criteria to be classified as pathogenic for autosomal dominant ZTTK syndrome. ACMG/AMP Criteria applied: PVS1, PS2_Moderate, PS4_Supporting, PM2_Supporting (Richards 2015). -
Pathogenic, no assertion criteria providedliterature onlyOMIMNov 02, 2016- -
Global developmental delay;C2315100:Failure to thrive Pathogenic:1
Likely pathogenic, criteria provided, single submitterclinical testingBaylor GeneticsJun 21, 2016- -

Computational scores

Source: dbNSFP v4.3

Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Pathogenic
0.63
D
BayesDel_noAF
Pathogenic
0.50
CADD
Pathogenic
36
DANN
Uncertain
1.0
Eigen
Pathogenic
1.0
Eigen_PC
Pathogenic
0.91
FATHMM_MKL
Uncertain
0.80
D
MutationTaster
Benign
1.0
A;A;A;A;D
Vest4
0.89
GERP RS
5.8
RBP_binding_hub_radar
0.0
RBP_regulation_power_radar
1.7

Splicing

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.

Other links and lift over

dbSNP: rs886039777; hg19: chr21-34921823; API