19-41397830-G-A

Position:

• chr19-41397830-G-A

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_000709.4(BCKDHA):​c.3G>A​(p.Met1?) variant causes a start lost change. 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 Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: BCKDHA NM_000709.4 start_lost
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 3.95

Genes affected

BCKDHA (HGNC:986): (branched chain keto acid dehydrogenase E1 subunit alpha) The branched-chain alpha-keto acid (BCAA) dehydrogenase (BCKD) complex is an innter mitochondrial enzyme complex that catalyzes the second major step in the catabolism of the branched-chain amino acids leucine, isoleucine, and valine. The BCKD complex consists of three catalytic components: a heterotetrameric (alpha2-beta2) branched-chain alpha-keto acid decarboxylase (E1), a dihydrolipoyl transacylase (E2), and a dihydrolipoamide dehydrogenase (E3). This gene encodes the alpha subunit of the decarboxylase (E1) component. Mutations in this gene result in maple syrup urine disease, type IA. Multiple transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Sep 2009]

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PVS1: Start lost variant, no new inframe start found.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 19-41397830-G-A is Pathogenic according to our data. Variant chr19-41397830-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 556147.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BCKDHA	NM_000709.4	c.3G>A	p.Met1?	start_lost	1/9	ENST00000269980.7	NP_000700.1
BCKDHA	NM_001164783.2	c.3G>A	p.Met1?	start_lost	1/9		NP_001158255.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BCKDHA	ENST00000269980.7	c.3G>A	p.Met1?	start_lost	1/9	1	NM_000709.4	ENSP00000269980	P1
BCKDHA	ENST00000457836.6	c.3G>A	p.Met1?	start_lost	1/9	2		ENSP00000416000
BCKDHA	ENST00000542943.5	c.3G>A	p.Met1?	start_lost	1/7	5		ENSP00000440345
BCKDHA	ENST00000538423.5	n.23G>A		non_coding_transcript_exon_variant	1/5	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Maple syrup urine disease Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Counsyl

Jan 15, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.62	D
BayesDel_noAF	Pathogenic	0.66
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Benign	0.026	T;.;.
Eigen	Uncertain	0.31
Eigen_PC	Uncertain	0.37
FATHMM_MKL	Uncertain	0.78	D
LIST_S2	Uncertain	0.90	D;D;D
M_CAP	Pathogenic	0.96	D
MetaRNN	Pathogenic	0.96	D;D;D
MetaSVM	Pathogenic	1.0	D
MutationTaster	Benign	1.0	D;D
PROVEAN	Benign	-0.62	N;N;N
REVEL	Pathogenic	0.72
Sift	Pathogenic	0.0	D;D;D
Sift4G	Pathogenic	0.0	D;D;D
Polyphen		0.53	P;.;.
Vest4		0.78
MutPred		0.76		Gain of relative solvent accessibility (P = 0.09);Gain of relative solvent accessibility (P = 0.09);Gain of relative solvent accessibility (P = 0.09);
MVP		1.0
ClinPred		0.97	D
GERP RS		5.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6
Varity_R		0.95
gMVP		0.60

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.090		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: rs1555764014; hg19: chr19-41903735;