rs121964849

Variant names:

• chr12-6869741-A-G
• rs121964849
• NM_000365.6:c.511A>G

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 8P and 0B. PM2 PP2 PP3_Strong PP5

The NM_000365.6(TPI1):​c.511A>G​(p.Ile171Val) 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. Variant has been reported in ClinVar as Pathogenic (no stars).

• Frequency: Genomes: not found (cov: 32)
• Consequence: TPI1 NM_000365.6 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 9.09
• Publications: 8 publications found

Genes affected

TPI1 (HGNC:12009): (triosephosphate isomerase 1) This gene encodes an enzyme, consisting of two identical proteins, which catalyzes the isomerization of glyceraldehydes 3-phosphate (G3P) and dihydroxy-acetone phosphate (DHAP) in glycolysis and gluconeogenesis. Mutations in this gene are associated with triosephosphate isomerase deficiency. Pseudogenes have been identified on chromosomes 1, 4, 6 and 7. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Apr 2009]

TPI1 Gene-Disease associations (from GenCC):

• triosephosphate isomerase deficiency

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: PanelApp Australia, Orphanet, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Likely_pathogenic. The variant received 8 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 5 curated pathogenic missense variants (we use a threshold of 10). The gene has 0 curated benign missense variants. Gene score misZ: -0.22304 (below the threshold of 3.09). Trascript score misZ: 1.6741 (below the threshold of 3.09). GenCC associations: The gene is linked to triosephosphate isomerase deficiency.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.983
• PP5: Variant 12-6869741-A-G is Pathogenic according to our data. Variant chr12-6869741-A-G is described in ClinVar as Pathogenic. ClinVar VariationId is 12472.Status of the report is no_assertion_criteria_provided, 0 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000365.6. 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
	TPI1	NM_000365.6	MANE Select	c.511A>G	p.Ile171Val	missense	Exon 5 of 7	NP_000356.1	P60174-1
	TPI1	NM_001159287.1		c.622A>G	p.Ile208Val	missense	Exon 5 of 7	NP_001152759.1	P60174-3
	TPI1	NM_001258026.2		c.265A>G	p.Ile89Val	missense	Exon 5 of 7	NP_001244955.1	P60174-4

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TPI1	ENST00000396705.10	TSL:1 MANE Select	c.511A>G	p.Ile171Val	missense	Exon 5 of 7	ENSP00000379933.4	P60174-1
	TPI1	ENST00000229270.8	TSL:1	c.622A>G	p.Ile208Val	missense	Exon 5 of 7	ENSP00000229270.4	P60174-3
	TPI1	ENST00000613953.4	TSL:1	c.622A>G	p.Ile208Val	missense	Exon 5 of 7	ENSP00000484435.1	P60174-3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
1	-	-	Triosephosphate isomerase deficiency (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.91
BayesDel_addAF	Pathogenic	0.57	D
BayesDel_noAF	Pathogenic	0.57
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.83	D
Eigen	Pathogenic	0.82
Eigen_PC	Pathogenic	0.73
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.97	D
M_CAP	Pathogenic	0.56	D
MetaRNN	Pathogenic	0.98	D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.8	H
PhyloP100		9.1
PrimateAI	Uncertain	0.58	T
PROVEAN	Benign	-0.83	N
REVEL	Pathogenic	0.91
Sift	Uncertain	0.0010	D
Sift4G	Pathogenic	0.0	D
Polyphen		0.98	D
Vest4		0.68
MutPred		0.93		Loss of methylation at K212 (P = 0.1134)
MVP		0.96
MPC		1.1
ClinPred		0.99	D
GERP RS		4.4
Varity_R		0.82
gMVP		0.85
Mutation Taster		=26/74	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

Other links and lift over

dbSNP: rs121964849; hg19: chr12-6978905;