2-199368631-C-T

Position:

• chr2-199368631-C-T

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PVS1 PM2 PP5

The NM_001172509.2(SATB2):​c.674G>A​(p.Trp225Ter) variant causes a stop gained 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. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SATB2 NM_001172509.2 stop_gained
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:1
• Conservation: PhyloP100: 7.91

Genes affected

SATB2 (HGNC:21637): (SATB homeobox 2) This gene encodes a DNA binding protein that specifically binds nuclear matrix attachment regions. The encoded protein is involved in transcription regulation and chromatin remodeling. Defects in this gene are associated with isolated cleft palate and cognitive disability. Alternate splicing results in multiple transcript variants that encode the same protein. [provided by RefSeq, Feb 2010]

ACMG classification

Verdict is Pathogenic. Variant got 11 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 2-199368631-C-T is Pathogenic according to our data. Variant chr2-199368631-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 437864.We mark this variant Likely_pathogenic, oryginal submissions are: {Pathogenic=1, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SATB2	NM_001172509.2	c.674G>A	p.Trp225Ter	stop_gained	6/11	ENST00000417098.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SATB2	ENST00000417098.6	c.674G>A	p.Trp225Ter	stop_gained	6/11	2	NM_001172509.2	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Nov 23, 2018

The W225X nonsense variant in the SATB2 gene is predicted to cause loss of normal protein function either through protein truncation or nonsense-mediated mRNA decay. The W225X variant is not observed in large population cohorts (Lek et al., 2016). Although this pathogenic variant has not been reported previously to our knowledge, its presence is consistent with the diagnosis of SATB2-associated syndrome in this individual. -

Chromosome 2q32-q33 deletion syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Dr Meenakshi Bhat Group, Centre for Human Genetics

Aug 15, 2017

The heterozygous nonsense variant [c.674G>A; p.Trp225*] in the exon 6 of the SATB2 gene. Stop gain mutation leads to loss of normal protein function through early truncation and hence this mutation could be the likely cause of clinical condition. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.66
CADD	Pathogenic	39
DANN	Uncertain	1.0
Eigen	Pathogenic	0.98
Eigen_PC	Pathogenic	0.89
FATHMM_MKL	Pathogenic	0.98	D
MutationTaster	Benign	1.0	A;A;A;A;D
Vest4		0.76
GERP RS		5.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.20		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.20		Position offset: -26

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1553493553; hg19: chr2-200233354;