rs28935769

Variant names:

• chr3-58430851-T-C
• rs28935769
• NM_000925.4:c.395A>G

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM2 PP3_Strong PP5_Moderate

The NM_000925.4(PDHB):​c.395A>G​(p.Tyr132Cys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,670 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. Y132Y) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: PDHB NM_000925.4 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 7.46

Genes affected

PDHB (HGNC:8808): (pyruvate dehydrogenase E1 subunit beta) The pyruvate dehydrogenase (PDH) complex is a nuclear-encoded mitochondrial multienzyme complex that catalyzes the overall conversion of pyruvate to acetyl-CoA and carbon dioxide, and provides the primary link between glycolysis and the tricarboxylic acid (TCA) cycle. The PDH complex is composed of multiple copies of three enzymatic components: pyruvate dehydrogenase (E1), dihydrolipoamide acetyltransferase (E2) and lipoamide dehydrogenase (E3). The E1 enzyme is a heterotetramer of two alpha and two beta subunits. This gene encodes the E1 beta subunit. Mutations in this gene are associated with pyruvate dehydrogenase E1-beta deficiency. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Mar 2012]

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.99
• PP5: Variant 3-58430851-T-C is Pathogenic according to our data. Variant chr3-58430851-T-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 13188.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PDHB	NM_000925.4	c.395A>G	p.Tyr132Cys	missense_variant	Exon 6 of 10	ENST00000302746.11	NP_000916.2
PDHB	NM_001173468.2	c.395A>G	p.Tyr132Cys	missense_variant	Exon 6 of 11		NP_001166939.1
PDHB	NM_001315536.2	c.341A>G	p.Tyr114Cys	missense_variant	Exon 5 of 9		NP_001302465.1
PDHB	NR_033384.2	n.501A>G		non_coding_transcript_exon_variant	Exon 5 of 9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PDHB	ENST00000302746.11	c.395A>G	p.Tyr132Cys	missense_variant	Exon 6 of 10	1	NM_000925.4	ENSP00000307241.6

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461670 Hom.: 0 Cov.: 35 AF XY: 0.00 AC XY: 0 AN XY: 727164

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: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Pyruvate dehydrogenase E1-beta deficiency Pathogenic:2

Jul 01, 2004

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Aug 19, 2024

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: PDHB c.395A>G (p.Tyr132Cys) results in a non-conservative amino acid change located in the Transketolase-like, pyrimidine-binding domain (IPR005475) of the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant was absent in 251494 control chromosomes. c.395A>G has been reported in the literature in individuals affected with Pyruvate Dehydrogenase E1-Beta Deficiency (examples:Brown_2004,Okajima_2008). These data indicate that the variant is likely to be associated with disease . At least one publication reports experimental evidence evaluating an impact on protein function. The most pronounced variant effect results in 16% of normal activity (Okajima_2008). The following publications have been ascertained in the context of this evaluation (PMID: 15138885, 18164639). ClinVar contains an entry for this variant (Variation ID: 13188). Based on the evidence outlined above, the variant was classified as likely pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.78
BayesDel_addAF	Pathogenic	0.55	D
BayesDel_noAF	Pathogenic	0.55
CADD	Pathogenic	31
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.87	D;.;.;D
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	0.98
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.95	D;D;D;D
M_CAP	Pathogenic	0.66	D
MetaRNN	Pathogenic	0.99	D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	4.4	H;.;H;.
PrimateAI	Pathogenic	0.85	D
PROVEAN	Pathogenic	-8.7	D;D;D;D
REVEL	Pathogenic	0.97
Sift	Pathogenic	0.0	D;D;D;D
Sift4G	Pathogenic	0.0010	D;D;D;D
Polyphen		1.0	D;D;.;D
Vest4		0.95
MutPred		0.94		Loss of phosphorylation at Y132 (P = 0.0678);.;Loss of phosphorylation at Y132 (P = 0.0678);.;
MVP		1.0
MPC		1.4
ClinPred		1.0	D
GERP RS		5.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.99
gMVP		0.98

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		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: rs28935769; hg19: chr3-58416578;