Genetic Variant ABCB5:p.Thr86Ile (chr7-20628836-C-T) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_001163941.2(ABCB5):c.257C>T(p.Thr86Ile) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,144 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 18/23 in silico tools predict a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. 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. T86K) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

ABCB5
NM_001163941.2 missense, splice_region

Scores

Splicing: ADA: 0.07532

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.214

Publications

0 publications found

Variant links:

Genes affected

ABCB5 (HGNC:46): (ATP binding cassette subfamily B member 5) ABCB5 belongs to the ATP-binding cassette (ABC) transporter superfamily of integral membrane proteins. These proteins participate in ATP-dependent transmembrane transport of structurally diverse molecules ranging from small ions, sugars, and peptides to more complex organic molecules (Chen et al., 2005 [PubMed 15760339]).[supplied by OMIM, Mar 2008]

ABCB5 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.19952115).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ABCB5	NM_001163941.2 link	c.257C>T	p.Thr86Ile	missense_variant, splice_region_variant	Exon 4 of 28	ENST00000404938.7	NP_001157413.1	Q2M3G0-4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ABCB5	ENST00000404938.7 link	c.257C>T	p.Thr86Ile	missense_variant, splice_region_variant	Exon 4 of 28	1	NM_001163941.2	ENSP00000384881.2		Q2M3G0-4

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461144

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

726872

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

33462

American (AMR)

AF:

0.00

AC:

AN:

44644

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26126

East Asian (EAS)

AF:

0.00

AC:

AN:

39690

South Asian (SAS)

AF:

0.00

AC:

AN:

86198

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53364

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5672

European-Non Finnish (NFE)

AF:

9.00e-7

AC:

AN:

1111648

Other (OTH)

AF:

0.00

AC:

AN:

60340

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.375

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.11

BayesDel_addAF

Benign

-0.13

BayesDel_noAF

Benign

-0.42

CADD

Benign

(source)

DANN

Benign

0.93

DEOGEN2

Benign

0.070

Eigen

Benign

-0.61

Eigen_PC

Benign

-0.50

FATHMM_MKL

Benign

0.33

LIST_S2

Benign

0.18

M_CAP

Benign

0.058

MetaRNN

Benign

0.20

MetaSVM

Benign

-0.72

PhyloP100

0.21

PrimateAI

Benign

0.39

PROVEAN

Benign

-0.37

REVEL

Benign

0.17

Sift

Benign

0.33

Sift4G

Benign

0.33

Vest4

0.43

MutPred

0.53

Loss of disorder (P = 0.0323);

MVP

0.76

MPC

0.010

ClinPred

0.092

GERP RS

1.3

Varity_R

0.044

gMVP

0.13

Mutation Taster

=81/19

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.075

dbscSNV1_RF

Benign

0.27

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

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7-20628836-C-T

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over