rs121909070

Variant names:

• chr18-3452156-C-G
• rs121909070
• ENST00000330513.10:c.-271C>G

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 3P and 1B. PM2 PP5 BP4

The NM_170695.5(TGIF1):​c.-271C>G variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Pathogenic (no stars).

• Frequency: Genomes: not found (cov: 32)
• Consequence: TGIF1 NM_170695.5 5_prime_UTR
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: -1.83
• Publications: 4 publications found

Genes affected

TGIF1 (HGNC:11776): (TGFB induced factor homeobox 1) The protein encoded by this gene is a member of the three-amino acid loop extension (TALE) superclass of atypical homeodomains. TALE homeobox proteins are highly conserved transcription regulators. This particular homeodomain binds to a previously characterized retinoid X receptor responsive element from the cellular retinol-binding protein II promoter. In addition to its role in inhibiting 9-cis-retinoic acid-dependent RXR alpha transcription activation of the retinoic acid responsive element, the protein is an active transcriptional co-repressor of SMAD2 and may participate in the transmission of nuclear signals during development and in the adult. Mutations in this gene are associated with holoprosencephaly type 4, which is a structural anomaly of the brain. Alternative splicing has been observed at this locus and multiple splice variants encoding distinct isoforms are described. [provided by RefSeq, Jul 2013]

TGIF1 Gene-Disease associations (from GenCC):

• holoprosencephaly 4

  Inheritance: AD Classification: DEFINITIVE, STRONG, LIMITED Submitted by: PanelApp Australia, Labcorp Genetics (formerly Invitae), Ambry Genetics, Laboratory for Molecular Medicine, G2P

ENSG00000302876 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 18-3452156-C-G is Pathogenic according to our data. Variant chr18-3452156-C-G is described in ClinVar as Pathogenic. ClinVar VariationId is 6983.Status of the report is no_assertion_criteria_provided, 0 stars.
• BP4: Computational evidence support a benign effect (BayesDel_addAF=-0.214322). . Strength limited to SUPPORTING due to the PP5.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_170695.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TGIF1	NM_003244.4	MANE Select	c.16+1651C>G		intron	N/A	NP_003235.1	Q15583-2
	TGIF1	NM_170695.5		c.-271C>G		5_prime_UTR	Exon 1 of 3	NP_733796.3
	TGIF1	NM_173207.4		c.59-4198C>G		intron	N/A	NP_775299.1	Q15583-3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TGIF1	ENST00000330513.10	TSL:1	c.-271C>G		5_prime_UTR	Exon 1 of 3	ENSP00000327959.6	Q15583-4
	TGIF1	ENST00000343820.10	TSL:1 MANE Select	c.16+1651C>G		intron	N/A	ENSP00000339631.6	Q15583-2
	TGIF1	ENST00000618001.4	TSL:2	c.59-4198C>G		intron	N/A	ENSP00000483499.1	Q15583-3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
1	-	-	Holoprosencephaly 4 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Benign	-0.21	T
BayesDel_noAF	Benign	-0.55
CADD	Benign	2.9
DANN	Benign	0.96
Eigen	Benign	-0.66
Eigen_PC	Benign	-1.1
FATHMM_MKL	Benign	0.017	N
PhyloP100		-1.8
PromoterAI		-0.035	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.3
Mutation Taster		=34/166	disease causing (ClinVar)

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs121909070;

hg19: chr18-3452154;