chr8-33512446-A-G

Variant names:

• chr8-33512446-A-G
• rs780348831
• NM_001102401.4:c.168T>C

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 2P and 7B. PM2 BP4_Strong BP6_Moderate BP7

The NM_001102401.4(TTI2):​c.168T>C​(p.Gly56Gly) variant causes a synonymous 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 Likely benign (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: TTI2 NM_001102401.4 synonymous
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -0.909
• Publications: 0 publications found

Genes affected

TTI2 (HGNC:26262): (TELO2 interacting protein 2) This gene encodes a regulator of the DNA damage response. The protein is a component of the Triple T complex (TTT) which also includes telomere length regulation protein and TELO2 interacting protein 1. The TTT complex is involved in cellular resistance to DNA damage stresses and may act as a regulator of phosphoinositide-3-kinase-related protein kinase (PIKK) abundance. [provided by RefSeq, May 2013]

TTI2 Gene-Disease associations (from GenCC):

• severe intellectual disability-short stature-behavioral abnormalities-facial dysmorphism syndrome

  Inheritance: AR Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics, Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.89).
• BP6: Variant 8-33512446-A-G is Benign according to our data. Variant chr8-33512446-A-G is described in ClinVar as Likely_benign. ClinVar VariationId is 437084.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP7: Synonymous conserved (PhyloP=-0.909 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001102401.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TTI2	NM_001102401.4	MANE Select	c.168T>C	p.Gly56Gly	synonymous	Exon 2 of 8	NP_001095871.1
	TTI2	NM_001265581.2		c.168T>C	p.Gly56Gly	synonymous	Exon 2 of 8	NP_001252510.1
	TTI2	NM_025115.5		c.168T>C	p.Gly56Gly	synonymous	Exon 1 of 7	NP_079391.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TTI2	ENST00000431156.7	TSL:1 MANE Select	c.168T>C	p.Gly56Gly	synonymous	Exon 2 of 8	ENSP00000411169.3
	TTI2	ENST00000613904.1	TSL:1	c.168T>C	p.Gly56Gly	synonymous	Exon 2 of 8	ENSP00000478396.1
	TTI2	ENST00000360742.9	TSL:2	c.168T>C	p.Gly56Gly	synonymous	Exon 1 of 7	ENSP00000353971.5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00000398 AC: 1 AN: 251472 AF XY: 0.00000736

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000879

Gnomad OTH exome AF: 0.00

GnomAD4 exome Cov.: 73

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Benign:1

Jun 08, 2016

Genetic Services Laboratory, University of Chicago

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.89
CADD	Benign	2.8
DANN	Benign	0.63
PhyloP100		-0.91
PromoterAI		-0.043	Neutral

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs780348831; hg19: chr8-33369964;