3-15635657-A-T

Variant names:

• chr3-15635657-A-T
• rs397514348
• NM_001370658.1:c.218A>T

Variant summary

Our verdict is Likely pathogenic. The variant received 7 ACMG points: 7P and 0B. PM1 PM2 PM5 PP2

The NM_001370658.1(BTD):​c.218A>T​(p.Tyr73Phe) variant causes a missense change. The variant allele was found at a frequency of 0.00000186 in 1,614,084 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. Y73C) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: BTD NM_001370658.1 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 4.77
• Publications: 6 publications found

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

ACMG classification

Our verdict: Likely_pathogenic. The variant received 7 ACMG points.

• PM1: In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 4 uncertain in NM_001370658.1
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr3-15635657-A-G is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 24993.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 88 curated pathogenic missense variants (we use a threshold of 10). The gene has 9 curated benign missense variants. Gene score misZ: -0.52516 (below the threshold of 3.09). Trascript score misZ: 0.15371 (below the threshold of 3.09). GenCC associations: The gene is linked to biotinidase deficiency, Leigh syndrome.

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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	BTD	NM_001370658.1	MANE Select	c.218A>T	p.Tyr73Phe	missense	Exon 2 of 4	NP_001357587.1	P43251-4
	BTD	NM_001281723.4		c.218A>T	p.Tyr73Phe	missense	Exon 2 of 4	NP_001268652.2	P43251-4
	BTD	NM_001281724.3		c.218A>T	p.Tyr73Phe	missense	Exon 4 of 6	NP_001268653.2	P43251-4

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	BTD	ENST00000643237.3	MANE Select	c.218A>T	p.Tyr73Phe	missense	Exon 2 of 4	ENSP00000495254.2	P43251-4
	BTD	ENST00000303498.10	TSL:1	c.218A>T	p.Tyr73Phe	missense	Exon 3 of 5	ENSP00000306477.6	P43251-4
	BTD	ENST00000427382.2	TSL:4	c.218A>T	p.Tyr73Phe	missense	Exon 2 of 4	ENSP00000397113.2	P43251-4

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152192 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461892 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 727248

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53418

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00000180 AC: 2 AN: 1112012

Other (OTH) AF: 0.00 AC: 0 AN: 60396

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152192 Hom.: 0 Cov.: 32 AF XY: 0.0000134 AC XY: 1 AN XY: 74360

African (AFR) AF: 0.00 AC: 0 AN: 41432

American (AMR) AF: 0.00 AC: 0 AN: 15274

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5202

South Asian (SAS) AF: 0.00 AC: 0 AN: 4828

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10622

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.0000147 AC: 1 AN: 68040

Other (OTH) AF: 0.00 AC: 0 AN: 2094

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Uncertain	0.082	D
BayesDel_noAF	Benign	-0.12
CADD	Benign	21
DANN	Uncertain	0.98
DEOGEN2	Benign	0.26	T
Eigen	Benign	0.13
Eigen_PC	Benign	0.16
FATHMM_MKL	Benign	0.74	D
LIST_S2	Uncertain	0.87	D
M_CAP	Uncertain	0.10	D
MetaRNN	Uncertain	0.51	D
MetaSVM	Uncertain	-0.15	T
MutationAssessor	Uncertain	2.1	M
PhyloP100		4.8
PrimateAI	Uncertain	0.51	T
PROVEAN	Benign	-0.96	N
REVEL	Uncertain	0.45
Sift	Benign	0.36	T
Sift4G	Benign	0.44	T
Polyphen		0.77	P
Vest4		0.42
MutPred		0.73		Loss of catalytic residue at I92 (P = 0.042)
MVP		0.84
MPC		0.15
ClinPred		0.76	D
GERP RS		3.5
PromoterAI		0.00050	Neutral
Varity_R		0.13
gMVP		0.85
Mutation Taster		=77/23	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs397514348; hg19: chr3-15677164;