2-161417795-G-C

Variant names:

• chr2-161417795-G-C
• rs1553510303
• NM_006593.4:c.812G>C

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PM1 PM2 PM5 PP3_Strong PP5_Moderate

The NM_006593.4(TBR1):​c.812G>C​(p.Trp271Ser) variant causes a missense 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. 12/20 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. W271R) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TBR1 NM_006593.4 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 9.91

Genes affected

TBR1 (HGNC:11590): (T-box brain transcription factor 1) This gene is a member of a conserved family of genes that share a common DNA-binding domain, the T-box. T-box genes encode transcription factors involved in the regulation of numerous developmental processes. In mouse, the ortholog of this gene is expressed in the cerebral cortex, hippocampus, amygdala and olfactory bulb and is thought to play an important role in neuronal migration and axonal projection. In mouse, the C-terminal region of this protein was found to be necessary and sufficient for association with the guanylate kinase domain of calcium/calmodulin-dependent serine protein kinase. [provided by RefSeq, Dec 2015]

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PM1: In a DNA_binding_region T-box (size 180) in uniprot entity TBR1_HUMAN there are 7 pathogenic changes around while only 1 benign (88%) in NM_006593.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chrnull-null-null-null is described in UniProt as null.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.992
• PP5: Variant 2-161417795-G-C is Pathogenic according to our data. Variant chr2-161417795-G-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 523676.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TBR1	NM_006593.4	c.812G>C	p.Trp271Ser	missense_variant	Exon 2 of 6	ENST00000389554.8	NP_006584.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TBR1	ENST00000389554.8	c.812G>C	p.Trp271Ser	missense_variant	Exon 2 of 6	1	NM_006593.4	ENSP00000374205.3
TBR1	ENST00000411412.5	c.17G>C	p.Trp6Ser	missense_variant	Exon 1 of 6	5		ENSP00000393934.1
TBR1	ENST00000463544.1	n.1465G>C		non_coding_transcript_exon_variant	Exon 1 of 2	2
TBR1	ENST00000410035.1	c.-307G>C		upstream_gene_variant		2		ENSP00000387023.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Moderate global developmental delay Pathogenic:1

Jun 22, 2017

Equipe Genetique des Anomalies du Developpement, Université de Bourgogne

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.51	D
BayesDel_noAF	Pathogenic	0.49
CADD	Pathogenic	34
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.93	D;.
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	1.0
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D;D
M_CAP	Pathogenic	0.69	D
MetaRNN	Pathogenic	0.99	D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	4.4	H;.
PrimateAI	Pathogenic	0.91	D
PROVEAN	Pathogenic	-12	D;D
REVEL	Pathogenic	0.93
Sift	Pathogenic	0.0	D;D
Sift4G	Uncertain	0.0050	D;D
Polyphen		1.0	D;.
Vest4		0.90
MutPred		0.94		Gain of disorder (P = 0.0061);.;
MVP		0.95
ClinPred		1.0	D
GERP RS		5.2
Varity_R		0.97
gMVP		0.98

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		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

Other links and lift over

dbSNP: rs1553510303; hg19: chr2-162274306;