chr3-15641908-G-T

Position:

• chr3-15641908-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP3_Moderate PP5

The NM_001370658.1(BTD):​c.250G>T​(p.Asp84Tyr) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in Lovd as Pathogenic (no stars).

• Frequency: Genomes: not found (cov: 32)
• Consequence: BTD NM_001370658.1 missense, splice_region
• Scores: Splicing: ADA: 0.9997
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 10.0

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 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.918
• PP5: Variant 3-15641908-G-T is Pathogenic according to our data. Variant chr3-15641908-G-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BTD	NM_001370658.1	c.250G>T	p.Asp84Tyr	missense_variant, splice_region_variant	3/4	ENST00000643237.3	NP_001357587.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BTD	ENST00000643237.3	c.250G>T	p.Asp84Tyr	missense_variant, splice_region_variant	3/4		NM_001370658.1	ENSP00000495254.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.14
BayesDel_addAF	Pathogenic	0.31	D
BayesDel_noAF	Pathogenic	0.21
CADD	Pathogenic	33
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.51	.;.;D;.;.;.;.;T;.;.
Eigen	Uncertain	0.56
Eigen_PC	Uncertain	0.66
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.94	.;D;D;.;D;.;D;D;D;D
M_CAP	Uncertain	0.12	D
MetaRNN	Pathogenic	0.92	D;D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.28	D
MutationAssessor	Benign	1.3	.;.;L;.;.;.;.;.;.;.
PrimateAI	Uncertain	0.54	T
PROVEAN	Benign	-2.0	.;N;.;.;.;.;N;N;N;.
REVEL	Pathogenic	0.68
Sift	Uncertain	0.0010	.;D;.;.;.;.;D;D;D;.
Sift4G	Uncertain	0.0020	.;D;.;.;.;.;D;D;D;.
Polyphen		0.88	.;.;P;.;.;.;.;.;.;.
Vest4		0.83, 0.84, 0.83
MutPred		0.86		.;.;Gain of methylation at K103 (P = 0.1566);.;Gain of methylation at K103 (P = 0.1566);.;.;.;.;.;
MVP		0.98
MPC		0.23
ClinPred		0.81	D
GERP RS		5.9
Varity_R		0.59
gMVP		0.85

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.99
SpliceAI score (max)		0.030		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: rs397514351; hg19: chr3-15683415;