Variant chr4-74750703-T-A details in Genebe, Genetics Data Aggregator

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_001729.4(BTC):c.298A>T(p.Ile100Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,330 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

BTC
NM_001729.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.252

Variant links:

Genes affected

BTC (HGNC:1121): (betacellulin) This gene encodes a member of the epidermal growth factor (EGF) family of proteins. Alternative splicing results in multiple transcript variants, at least one of which encodes a preproprotein that is proteolytically processed to generate the secreted growth factor. A secreted form and a membrane-anchored form of this protein bind to multiple different EGF receptors. This protein promotes pancreatic cell proliferation and insulin secretion, as well as retinal vascular permeability. Mutations in this gene may be associated with type 2 diabetes in human patients. [provided by RefSeq, Nov 2015]

BTC links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.20001537).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
BTC	NM_001729.4 linkuse as main transcript	c.298A>T	p.Ile100Phe	missense_variant	4/6	ENST00000395743.8
BTC	XM_011532211.2 linkuse as main transcript	c.298A>T	p.Ile100Phe	missense_variant	4/6
BTC	NM_001316963.2 linkuse as main transcript	c.282-2554A>T		intron_variant
BTC	XM_047416103.1 linkuse as main transcript	c.282-2554A>T		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BTC	ENST00000395743.8 linkuse as main transcript	c.298A>T	p.Ile100Phe	missense_variant	4/6	1	NM_001729.4	P1
BTC	ENST00000512743.1 linkuse as main transcript	c.218-2554A>T		intron_variant		5

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000399

AC:

AN:

250898

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135610

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000880

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1461330

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726936

show subpopulations

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:

0.00000180

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ExAC

AF:

0.00000824

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 12, 2023

The c.298A>T (p.I100F) alteration is located in exon 4 (coding exon 4) of the BTC gene. This alteration results from a A to T substitution at nucleotide position 298, causing the isoleucine (I) at amino acid position 100 to be replaced by a phenylalanine (F). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.072

BayesDel_addAF

Benign

-0.39

BayesDel_noAF

Benign

-0.80

CADD

Benign

DANN

Benign

0.63

DEOGEN2

Uncertain

0.48

Eigen

Benign

-1.1

Eigen_PC

Benign

-1.1

FATHMM_MKL

Benign

0.22

LIST_S2

Benign

0.38

M_CAP

Benign

0.0042

MetaRNN

Benign

0.20

MetaSVM

Benign

-1.0

MutationAssessor

Benign

0.41

MutationTaster

Benign

1.0

PrimateAI

Benign

0.33

PROVEAN

Uncertain

-2.4

REVEL

Benign

0.033

Sift

Benign

0.22

Sift4G

Benign

0.76

Polyphen

0.0

Vest4

0.10

MutPred

0.47

Gain of glycosylation at Y99 (P = 0.0347);

MVP

0.12

MPC

0.038

ClinPred

0.038

GERP RS

-3.8

Varity_R

0.045

gMVP

0.54

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