chr3-15635507-A-G

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_001370658.1(BTD):c.68A>G(p.His23Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000634 in 1,614,048 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00041 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00066 ( 1 hom. )

Consequence

BTD
NM_001370658.1 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:5B:1O:1

Conservation

PhyloP100: -0.380

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.041680098).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BTD	NM_001370658.1 link	c.68A>G	p.His23Arg	missense_variant	Exon 2 of 4	ENST00000643237.3	NP_001357587.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BTD	ENST00000643237.3 link	c.68A>G	p.His23Arg	missense_variant	Exon 2 of 4		NM_001370658.1	ENSP00000495254.2		P43251-4

Frequencies

GnomAD3 genomes

AF:

0.000414

AC:

AN:

152156

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000262

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000691

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000358

AC:

AN:

251424

Hom.:

AF XY:

0.000383

AC XY:

AN XY:

135884

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000173

Gnomad ASJ exome

AF:

0.000198

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000294

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000616

Gnomad OTH exome

AF:

0.000489

GnomAD4 exome

AF:

0.000657

AC:

961

AN:

1461892

Hom.:

Cov.:

AF XY:

0.000635

AC XY:

462

AN XY:

727246

show subpopulations

Gnomad4 AFR exome

AF:

0.0000896

Gnomad4 AMR exome

AF:

0.000246

Gnomad4 ASJ exome

AF:

0.0000383

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000278

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000784

Gnomad4 OTH exome

AF:

0.000828

GnomAD4 genome

AF:

0.000414

AC:

AN:

152156

Hom.:

Cov.:

AF XY:

0.000350

AC XY:

AN XY:

74336

show subpopulations

Gnomad4 AFR

AF:

0.000241

Gnomad4 AMR

AF:

0.000262

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000207

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000691

Gnomad4 OTH

AF:

0.000478

Alfa

AF:

0.000535

Hom.:

Bravo

AF:

0.000329

TwinsUK

AF:

0.000809

AC:

ALSPAC

AF:

0.00130

AC:

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.000930

AC:

ExAC

AF:

0.000354

AC:

EpiCase

AF:

0.000382

EpiControl

AF:

0.000533

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:5Benign:1Other:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Biotinidase deficiency

Uncertain:3Benign:1Other:1

Oct 22, 2022

Baylor Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Oct 24, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces histidine, which is basic and polar, with arginine, which is basic and polar, at codon 43 of the BTD protein (p.His43Arg). This variant is present in population databases (rs146011150, gnomAD 0.07%). This missense change has been observed in individual(s) with a positive newborn screening result for BTD-related disease (PMID: 26810761). ClinVar contains an entry for this variant (Variation ID: 38483). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The arginine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

GenomeConnect, ClinGen

Significance: not provided

Review Status: no classification provided

Collection Method: phenotyping only

GenomeConnect assertions are reported exactly as they appear on the patient-provided report from the testing laboratory. GenomeConnect staff make no attempt to reinterpret the clinical significance of the variant. -

Jan 01, 2019

Institute of Human Genetics, University of Leipzig Medical Center

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Feb 04, 2020

Natera, Inc.

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Inborn genetic diseases

Uncertain:1

Jun 29, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.128A>G (p.H43R) alteration is located in exon 2 (coding exon 2) of the BTD gene. This alteration results from a A to G substitution at nucleotide position 128, causing the histidine (H) at amino acid position 43 to be replaced by an arginine (R). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Intellectual disability

Uncertain:1

Jan 01, 2019

Centre de Biologie Pathologie Génétique, Centre Hospitalier Universitaire de Lille

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.056

BayesDel_addAF

Benign

-0.22

BayesDel_noAF

Benign

-0.13

CADD

Benign

0.99

DANN

Benign

0.57

DEOGEN2

Benign

0.23

.;.;T;.;.;.;.;T;.;.

Eigen

Benign

-1.4

Eigen_PC

Benign

-1.4

FATHMM_MKL

Benign

0.043

LIST_S2

Benign

0.48

.;T;T;.;T;.;T;T;T;T

M_CAP

Benign

0.080

MetaRNN

Benign

0.042

T;T;T;T;T;T;T;T;T;T

MetaSVM

Benign

-0.32

MutationAssessor

Benign

1.7

.;.;L;.;.;.;.;.;.;.

PrimateAI

Benign

0.27

PROVEAN

Uncertain

-3.9

D;N;.;.;.;.;N;N;N;.

REVEL

Uncertain

0.33

Sift

Benign

0.34

T;T;.;.;.;.;T;T;T;.

Sift4G

Benign

0.28

T;T;.;.;.;.;T;T;T;.

Polyphen

0.028

.;.;B;.;.;.;.;.;.;.

Vest4

0.098, 0.097, 0.092

MVP

0.68

MPC

0.086

ClinPred

0.020

GERP RS

-3.2

Varity_R

0.028

gMVP

0.33

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

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