Genetic Variant DBT:c.1281+6T>C (chr1-100206224-A-G) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_001918.5(DBT):c.1281+6T>C variant causes a splice region, intron change. The variant allele was found at a frequency of 0.00000138 in 1,453,494 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: not found (cov: 31)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

DBT
NM_001918.5 splice_region, intron

Scores

Splicing: ADA: 0.01251

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 5.57

Publications

0 publications found

Variant links:

Genes affected

DBT (HGNC:2698): (dihydrolipoamide branched chain transacylase E2) The branched-chain alpha-keto acid dehydrogenase complex (BCKD) is an inner-mitochondrial enzyme complex involved in the breakdown of the branched-chain amino acids isoleucine, leucine, and valine. The BCKD complex is thought to be composed of a core of 24 transacylase (E2) subunits, and associated decarboxylase (E1), dehydrogenase (E3), and regulatory subunits. This gene encodes the transacylase (E2) subunit. Mutations in this gene result in maple syrup urine disease, type 2. Alternatively spliced transcript variants have been described, but their biological validity has not been determined. [provided by RefSeq, Jul 2008]

DBT Gene-Disease associations (from GenCC):

maple syrup urine disease
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), ClinGen
maple syrup urine disease type 2
Inheritance: AR Classification: DEFINITIVE Submitted by: Myriad Women’s Health, G2P
classic maple syrup urine disease
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
intermediate maple syrup urine disease
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
intermittent maple syrup urine disease
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
thiamine-responsive maple syrup urine disease
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

DBT links:

ENSG00000285530 (HGNC:):

ENSG00000285530 links:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.8).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DBT	NM_001918.5 link	c.1281+6T>C		splice_region_variant, intron_variant	Intron 10 of 10	ENST00000370132.8	NP_001909.4	P11182

Ensembl

Gene	Transcript	HGVSc	Effect	Exon rank	TSL	MANE	Protein	UniProt
DBT	ENST00000370132.8 link	c.1281+6T>C	splice_region_variant, intron_variant	Intron 10 of 10	1	NM_001918.5	ENSP00000359151.3	P11182
DBT	ENST00000681617.1 link	c.1407+6T>C	splice_region_variant, intron_variant	Intron 11 of 11			ENSP00000505544.1	A0A7P0Z494
DBT	ENST00000681780.1 link	c.738+6T>C	splice_region_variant, intron_variant	Intron 11 of 11			ENSP00000505780.1	A0A7P0T9W1
ENSG00000285530	ENST00000835180.1 link	n.140-12420A>G	intron_variant	Intron 2 of 4

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000138

AC:

AN:

1453494

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

723756

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33308

American (AMR)

AF:

0.00

AC:

AN:

44672

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26078

East Asian (EAS)

AF:

0.00

AC:

AN:

39636

South Asian (SAS)

AF:

0.0000116

AC:

AN:

86002

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53392

Middle Eastern (MID)

AF:

0.000174

AC:

AN:

5756

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1104530

Other (OTH)

AF:

0.00

AC:

AN:

60120

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.80

CADD

Benign

(source)

DANN

Benign

0.52

PhyloP100

5.6

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.013

dbscSNV1_RF

Benign

0.33

SpliceAI score (max)

0.060

Details are displayed if max score is > 0.2

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over