Genetic Variant DBT:c.1210-9_1210-8insTTTT (chr1-100206309-T-TAAAA) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001918.5(DBT):c.1210-9_1210-8insTTTT variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000769 in 1,300,892 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: not found (cov: 29)

Exomes 𝑓: 7.7e-7 ( 0 hom. )

Consequence

DBT
NM_001918.5 intron

Scores

Not classified

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.732

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: Uncertain_significance. The variant received 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
DBT	NM_001918.5 link	c.1210-9_1210-8insTTTT		intron_variant	Intron 9 of 10	ENST00000370132.8	NP_001909.4	P11182

Ensembl

Gene	Transcript	HGVSc	Effect	Exon rank	TSL	MANE	Protein	UniProt
DBT	ENST00000370132.8 link	c.1210-9_1210-8insTTTT	intron_variant	Intron 9 of 10	1	NM_001918.5	ENSP00000359151.3	P11182
DBT	ENST00000681617.1 link	c.1336-9_1336-8insTTTT	intron_variant	Intron 10 of 11			ENSP00000505544.1	A0A7P0Z494
DBT	ENST00000681780.1 link	c.667-9_667-8insTTTT	intron_variant	Intron 10 of 11			ENSP00000505780.1	A0A7P0T9W1
ENSG00000285530	ENST00000835180.1 link	n.140-12335_140-12334insAAAA	intron_variant	Intron 2 of 4

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

7.69e-7

AC:

AN:

1300892

Hom.:

Cov.:

AF XY:

0.00000154

AC XY:

AN XY:

650270

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

32006

American (AMR)

AF:

0.00

AC:

AN:

39390

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

23752

East Asian (EAS)

AF:

0.00

AC:

AN:

36930

South Asian (SAS)

AF:

0.0000125

AC:

AN:

80024

European-Finnish (FIN)

AF:

0.00

AC:

AN:

48184

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5322

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

981038

Other (OTH)

AF:

0.00

AC:

AN:

54246

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.225

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

0.73

Splicing

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

ClinVar

Computational scores

Splicing

Publications

Other links and lift over