6-80106694-A-T

Position:

chr6-80106694-A-T

Variant summary

Our verdict is Pathogenic. Variant got 20 ACMG points: 20P and 0B. PVS1PS1_ModeratePM2PP5_Very_Strong

The NM_183050.4(BCKDHB):c.1A>T(p.Met1?) variant causes a start lost change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000965 in 1,554,802 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 (★★).

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000093 ( 0 hom. )

Consequence

BCKDHB
NM_183050.4 start_lost

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3

Conservation

PhyloP100: 2.22

Variant links:

Genes affected

BCKDHB (HGNC:987): (branched chain keto acid dehydrogenase E1 subunit beta) This gene encodes the E1 beta subunit of branched-chain keto acid dehydrogenase, which is a multienzyme complex associated with the inner membrane of mitochondria. This enzyme complex functions in the catabolism of branched-chain amino acids. Mutations in this gene have been associated with maple syrup urine disease (MSUD), type 1B, a disease characterized by a maple syrup odor to the urine in addition to mental and physical retardation and feeding problems. Alternative splicing at this locus results in multiple transcript variants. [provided by RefSeq, Jan 2016]

BCKDHB links:

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ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 20 ACMG points.

PVS1

Start lost variant, no new inframe start found.

PS1

Another start lost variant in NM_183050.4 (BCKDHB) was described as [Likely_pathogenic] in ClinVar as 553562

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 6-80106694-A-T is Pathogenic according to our data. Variant chr6-80106694-A-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 551456.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BCKDHB	NM_183050.4 linkuse as main transcript	c.1A>T	p.Met1?	start_lost	1/10	ENST00000320393.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BCKDHB	ENST00000320393.9 linkuse as main transcript	c.1A>T	p.Met1?	start_lost	1/10	1	NM_183050.4	P1	P21953-1
BCKDHB	ENST00000356489.9 linkuse as main transcript	c.1A>T	p.Met1?	start_lost	1/11	1		P1	P21953-1
BCKDHB	ENST00000369760.8 linkuse as main transcript	c.1A>T	p.Met1?	start_lost	1/6	3			P21953-2

Frequencies

GnomAD3 genomes

AF:

0.0000132

AC:

AN:

152000

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000242

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000129

AC:

AN:

155290

Hom.:

AF XY:

0.0000120

AC XY:

AN XY:

83284

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000345

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000927

AC:

AN:

1402802

Hom.:

Cov.:

AF XY:

0.0000101

AC XY:

AN XY:

692504

show subpopulations

Gnomad4 AFR exome

AF:

0.0000314

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:

0.0000111

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000132

AC:

AN:

152000

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74228

show subpopulations

Gnomad4 AFR

AF:

0.0000242

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.0000151

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Maple syrup urine disease

Pathogenic:2

Likely pathogenic, criteria provided, single submitter	clinical testing	Counsyl	Apr 11, 2017	- -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 11, 2024	This sequence change affects the initiator methionine of the BCKDHB mRNA. The next in-frame methionine is located at codon 71. This variant is present in population databases (no rsID available, gnomAD 0.004%). Disruption of the initiator codon has been observed in individual(s) with maple syrup urine disease (PMID: 26257134, 31980395; Invitae). ClinVar contains an entry for this variant (Variation ID: 551456). For these reasons, this variant has been classified as Pathogenic. -

Maple syrup urine disease type 1B

Pathogenic:1

Pathogenic, criteria provided, single submitter

research

Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center

Mar 17, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.33

BayesDel_noAF

Pathogenic

0.35

CADD

Benign

DANN

Benign

0.94

DEOGEN2

Benign

0.17

.;T;T

Eigen

Benign

-0.25

Eigen_PC

Benign

-0.15

FATHMM_MKL

Benign

0.52

LIST_S2

Uncertain

0.90

D;.;D

M_CAP

Pathogenic

1.0

MetaRNN

Pathogenic

0.98

D;D;D

MetaSVM

Uncertain

0.27

MutationTaster

Benign

1.0

D;D;D;D

PROVEAN

Benign

-0.39

N;N;N

REVEL

Uncertain

0.60

Sift

Pathogenic

0.0

D;D;D

Sift4G

Pathogenic

0.0

D;D;D

Polyphen

0.025

.;B;B

Vest4

0.83

MutPred

0.82

Loss of solvent accessibility (P = 0.0152);Loss of solvent accessibility (P = 0.0152);Loss of solvent accessibility (P = 0.0152);

MVP

0.93

ClinPred

1.0

GERP RS

4.2

Varity_R

0.96

gMVP

0.55

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.040

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over