ENST00000229270.8:c.66G>C

Variant names:

• chr12-6867521-G-C
• rs1800201
• ENST00000229270.8:c.66G>C

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 2P and 3B. PM2 BP4_Moderate BP7

The ENST00000229270.8(TPI1):​c.66G>C​(p.Pro22Pro) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000139 in 1,444,038 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. P22P) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: TPI1 ENST00000229270.8 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.76
• Publications: 0 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: Labcorp Genetics (formerly Invitae), Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.19).
• BP7: Synonymous conserved (PhyloP=1.76 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TPI1	NM_001159287.1	c.66G>C	p.Pro22Pro	synonymous_variant	Exon 1 of 7		NP_001152759.1
TPI1	NM_000365.6	c.-46G>C		upstream_gene_variant		ENST00000396705.10	NP_000356.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TPI1	ENST00000229270.8	c.66G>C	p.Pro22Pro	synonymous_variant	Exon 1 of 7	1		ENSP00000229270.4
TPI1	ENST00000613953.4	c.66G>C	p.Pro22Pro	synonymous_variant	Exon 1 of 7	1		ENSP00000484435.1
TPI1	ENST00000396705.10	c.-46G>C		upstream_gene_variant		1	NM_000365.6	ENSP00000379933.4

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome AF: 0.00000139 AC: 2 AN: 1444038 Hom.: 0 Cov.: 34 AF XY: 0.00000139 AC XY: 1 AN XY: 717012

African (AFR) AF: 0.00 AC: 0 AN: 33054

American (AMR) AF: 0.00 AC: 0 AN: 41768

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25762

East Asian (EAS) AF: 0.00 AC: 0 AN: 39044

South Asian (SAS) AF: 0.00 AC: 0 AN: 84416

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 51138

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5704

European-Non Finnish (NFE) AF: 0.00000181 AC: 2 AN: 1103484

Other (OTH) AF: 0.00 AC: 0 AN: 59668

GnomAD4 genome Cov.: 34

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.19
CADD	Benign	15
DANN	Benign	0.92
PhyloP100		1.8
PromoterAI		-0.49	Neutral

Splicing

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

Other links and lift over

dbSNP: rs1800201; hg19: chr12-6976685;