rs587783004

Positions:

• chr3-15644539-A-G

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM2 PM5 PP3_Moderate PP5

The NM_001370658.1(BTD):​c.623A>G​(p.Asp208Gly) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,890 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 Pathogenic (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D208Y) has been classified as Pathogenic.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: BTD NM_001370658.1 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 8.95

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]

ACMG classification

Verdict is Likely_pathogenic. Variant got 7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr3-15644538-G-T is described in Lovd as [Pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.918
• PP5: Variant 3-15644539-A-G is Pathogenic according to our data. Variant chr3-15644539-A-G is described in ClinVar as [Pathogenic]. Clinvar id is 156002.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BTD	NM_001370658.1	c.623A>G	p.Asp208Gly	missense_variant	4/4	ENST00000643237.3	NP_001357587.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BTD	ENST00000643237.3	c.623A>G	p.Asp208Gly	missense_variant	4/4		NM_001370658.1	ENSP00000495254	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461890 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727248

Gnomad4 AFR exome AF: 0.00

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: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

Bravo AF: 0.00000378

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Biotinidase deficiency Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

Molecular Genetics Diagnostic Laboratory, Detroit Medical Center University Laboratories

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.46
BayesDel_addAF	Uncertain	0.15	D
BayesDel_noAF	Uncertain	-0.030
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.55	.;.;D;.;.;.;T;.
Eigen	Uncertain	0.53
Eigen_PC	Uncertain	0.43
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.89	.;D;D;.;.;D;T;D
M_CAP	Pathogenic	0.42	D
MetaRNN	Pathogenic	0.92	D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.54	D
MutationAssessor	Uncertain	2.1	.;.;M;.;.;.;.;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Benign	0.38	T
PROVEAN	Uncertain	-4.3	.;D;.;N;.;D;D;D
REVEL	Pathogenic	0.88
Sift	Uncertain	0.0030	.;D;.;T;.;D;D;D
Sift4G	Uncertain	0.0040	.;D;.;.;.;D;D;D
Polyphen		1.0	.;.;D;.;.;.;.;.
Vest4		0.80, 0.84, 0.77
MutPred		0.66		.;.;Loss of stability (P = 0.0385);.;.;.;.;.;
MVP		0.97
MPC		0.47
ClinPred		0.99	D
GERP RS		5.5
Varity_R		0.90
gMVP		0.93

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

Other links and lift over

dbSNP: rs587783004; hg19: chr3-15686046;