Genetic Variant BTD:p.Gly347Gly (chr3-15644957-C-T) – ACMG Classification: Benign (-11 pts)

Variant summary

Our verdict is Benign. The variant received -11 ACMG points: 0P and 11B. BP4_StrongBP6BP7BS1BS2_Supporting

The NM_001370658.1(BTD):c.1041C>T(p.Gly347Gly) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000716 in 1,614,096 control chromosomes in the GnomAD database, including 11 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. G347G) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00074 ( 2 hom., cov: 32)

Exomes 𝑓: 0.00071 ( 9 hom. )

Consequence

BTD
NM_001370658.1 synonymous

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:6

Conservation

PhyloP100: -2.31

Publications

4 publications found

Variant links:

Genes affected

BTD (HGNC:1122): (biotinidase) The protein encoded by this gene functions to recycle protein-bound biotin by cleaving biocytin (biotin-epsilon-lysine), a normal product of carboxylase degradation, resulting in regeneration of free biotin. The encoded protein has also been shown to have biotinyl transferase activity. Mutations in this gene are associated with biotinidase deficiency. Multiple transcript variants encoding different isoforms have been described. [provided by RefSeq, Aug 2013]

BTD Gene-Disease associations (from GenCC):

biotinidase deficiency
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, Myriad Women’s Health, Labcorp Genetics (formerly Invitae), G2P, Orphanet, Ambry Genetics
Leigh syndrome
Inheritance: AR Classification: MODERATE Submitted by: ClinGen

BTD links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -11 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.76).

BP6

Variant 3-15644957-C-T is Benign according to our data. Variant chr3-15644957-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 282920.

BP7

Synonymous conserved (PhyloP=-2.31 with no splicing effect.

BS1

Variant frequency is greater than expected in population eas. GnomAdExome4 allele frequency = 0.000713 (1042/1461890) while in subpopulation EAS AF = 0.0203 (804/39700). AF 95% confidence interval is 0.0191. There are 9 homozygotes in GnomAdExome4. There are 530 alleles in the male GnomAdExome4 subpopulation. Median coverage is 31. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 2 AR geneVariant has number of homozygotes lower than other variant known as pathogenic in the gene, so the strength is limited to Supporting.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001370658.1. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
BTD	NM_001370658.1	MANE Select	c.1041C>T	p.Gly347Gly	synonymous	Exon 4 of 4	NP_001357587.1	P43251-4
BTD	NM_001281723.4		c.1041C>T	p.Gly347Gly	synonymous	Exon 4 of 4	NP_001268652.2	P43251-4
BTD	NM_001281724.3		c.1041C>T	p.Gly347Gly	synonymous	Exon 6 of 6	NP_001268653.2	P43251-4

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
BTD	ENST00000643237.3	MANE Select	c.1041C>T	p.Gly347Gly	synonymous	Exon 4 of 4	ENSP00000495254.2	P43251-4
BTD	ENST00000303498.10	TSL:1	c.1041C>T	p.Gly347Gly	synonymous	Exon 5 of 5	ENSP00000306477.6	P43251-4
BTD	ENST00000427382.2	TSL:4	c.1041C>T	p.Gly347Gly	synonymous	Exon 4 of 4	ENSP00000397113.2	P43251-4

Frequencies

GnomAD3 genomes

AF:

0.000756

AC:

115

AN:

152088

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000242

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000328

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.0171

Gnomad SAS

AF:

0.00270

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000735

Gnomad OTH

AF:

0.000957

GnomAD2 exomes

AF:

0.00144

AC:

363

AN:

251448

AF XY:

0.00123

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.0000867

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0178

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000141

Gnomad OTH exome

AF:

0.000651

GnomAD4 exome

AF:

0.000713

AC:

1042

AN:

1461890

Hom.:

Cov.:

AF XY:

0.000729

AC XY:

530

AN XY:

727246

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.000447

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.0000383

AC:

AN:

26136

East Asian (EAS)

AF:

0.0203

AC:

804

AN:

39700

South Asian (SAS)

AF:

0.000719

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53418

Middle Eastern (MID)

AF:

0.000520

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.0000944

AC:

105

AN:

1112010

Other (OTH)

AF:

0.000778

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.484

Heterozygous variant carriers

176

263

351

439

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

100

<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

AF:

0.000742

AC:

113

AN:

152206

Hom.:

Cov.:

AF XY:

0.000887

AC XY:

AN XY:

74394

show subpopulations

African (AFR)

AF:

0.0000241

AC:

AN:

41524

American (AMR)

AF:

0.000327

AC:

AN:

15282

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.0172

AC:

AN:

5180

South Asian (SAS)

AF:

0.00249

AC:

AN:

4814

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10594

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000735

AC:

AN:

68022

Other (OTH)

AF:

0.000473

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.501

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

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

Alfa

AF:

0.000246

Hom.:

Bravo

AF:

0.000899

Asia WGS

AF:

0.00837

AC:

AN:

3478

EpiCase

AF:

0.000164

EpiControl

AF:

0.0000593

ClinVar

ClinVar submissions

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

Biotinidase deficiency (4)

not specified (3)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.76

CADD

Benign

0.36

(source)

DANN

Benign

0.49

PhyloP100

-2.3

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Mutation Taster

=98/2

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over