11-747503-C-A

Variant names:

• chr11-747503-C-A
• rs948450387
• NM_006755.2:c.22C>A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_006755.2(TALDO1):​c.22C>A​(p.Arg8Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000138 in 1,447,732 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: TALDO1 NM_006755.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.95

Genes affected

TALDO1 (HGNC:11559): (transaldolase 1) Transaldolase 1 is a key enzyme of the nonoxidative pentose phosphate pathway providing ribose-5-phosphate for nucleic acid synthesis and NADPH for lipid biosynthesis. This pathway can also maintain glutathione at a reduced state and thus protect sulfhydryl groups and cellular integrity from oxygen radicals. The functional gene of transaldolase 1 is located on chromosome 11 and a pseudogene is identified on chromosome 1 but there are conflicting map locations. The second and third exon of this gene were developed by insertion of a retrotransposable element. This gene is thought to be involved in multiple sclerosis. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TALDO1	NM_006755.2	c.22C>A	p.Arg8Ser	missense_variant	Exon 1 of 8	ENST00000319006.8	NP_006746.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TALDO1	ENST00000319006.8	c.22C>A	p.Arg8Ser	missense_variant	Exon 1 of 8	1	NM_006755.2	ENSP00000321259.3

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome AF: 0.00000138 AC: 2 AN: 1447732 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 720078

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000181

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 34

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Jul 14, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals affected with TALDO1-related conditions. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This sequence change replaces arginine, which is basic and polar, with serine, which is neutral and polar, at codon 8 of the TALDO1 protein (p.Arg8Ser). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.41
BayesDel_addAF	Uncertain	0.037	T
BayesDel_noAF	Benign	-0.19
CADD	Benign	23
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.44	T;.
Eigen	Benign	-0.091
Eigen_PC	Benign	-0.047
FATHMM_MKL	Uncertain	0.84	D
LIST_S2	Benign	0.78	T;T
M_CAP	Pathogenic	0.87	D
MetaRNN	Uncertain	0.53	D;D
MetaSVM	Benign	-0.37	T
MutationAssessor	Benign	1.7	L;.
PrimateAI	Pathogenic	0.92	D
PROVEAN	Benign	-1.1	N;N
REVEL	Uncertain	0.31
Sift	Benign	0.033	D;T
Sift4G	Benign	0.097	T;T
Polyphen		0.65	P;P
Vest4		0.51
MutPred		0.22		Gain of phosphorylation at R8 (P = 0.011);Gain of phosphorylation at R8 (P = 0.011);
MVP		0.95
MPC		0.15
ClinPred		0.71	D
GERP RS		2.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.29
gMVP		0.60

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: rs948450387; hg19: chr11-747503;