7-87549770-G-T

Variant names:

• chr7-87549770-G-T
• rs2235035
• NM_001348946.2:c.1554+81C>A

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001348946.2(ABCB1):​c.1554+81C>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000149 in 1,343,690 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000015 (0 hom.)
• Consequence: ABCB1 NM_001348946.2 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.0720
• Publications: 0 publications found

Genes affected

ABCB1 (HGNC:40): (ATP binding cassette subfamily B member 1) The membrane-associated protein encoded by this gene is a member of the superfamily of ATP-binding cassette (ABC) transporters. ABC proteins transport various molecules across extra- and intra-cellular membranes. ABC genes are divided into seven distinct subfamilies (ABC1, MDR/TAP, MRP, ALD, OABP, GCN20, White). This protein is a member of the MDR/TAP subfamily. Members of the MDR/TAP subfamily are involved in multidrug resistance. The protein encoded by this gene is an ATP-dependent drug efflux pump for xenobiotic compounds with broad substrate specificity. It is responsible for decreased drug accumulation in multidrug-resistant cells and often mediates the development of resistance to anticancer drugs. This protein also functions as a transporter in the blood-brain barrier. Mutations in this gene are associated with colchicine resistance and Inflammatory bowel disease 13. Alternative splicing and the use of alternative promoters results in multiple transcript variants. [provided by RefSeq, Feb 2017]

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.85).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ABCB1	NM_001348946.2	c.1554+81C>A		intron_variant	Intron 13 of 27	ENST00000622132.5	NP_001335875.1
ABCB1	NM_001348945.2	c.1764+81C>A		intron_variant	Intron 17 of 31		NP_001335874.1
ABCB1	NM_000927.5	c.1554+81C>A		intron_variant	Intron 14 of 28		NP_000918.2
ABCB1	NM_001348944.2	c.1554+81C>A		intron_variant	Intron 15 of 29		NP_001335873.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ABCB1	ENST00000622132.5	c.1554+81C>A		intron_variant	Intron 13 of 27	1	NM_001348946.2	ENSP00000478255.1
ABCB1	ENST00000265724.8	c.1554+81C>A		intron_variant	Intron 14 of 28	1		ENSP00000265724.3
ABCB1	ENST00000543898.5	c.1362+81C>A		intron_variant	Intron 13 of 27	5		ENSP00000444095.1
ABCB1	ENST00000482527.1	n.308+81C>A		intron_variant	Intron 1 of 2	4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000149 AC: 2 AN: 1343690 Hom.: 0 AF XY: 0.00000296 AC XY: 2 AN XY: 675350

African (AFR) AF: 0.00 AC: 0 AN: 30904

American (AMR) AF: 0.00 AC: 0 AN: 44470

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25380

East Asian (EAS) AF: 0.00 AC: 0 AN: 39094

South Asian (SAS) AF: 0.0000120 AC: 1 AN: 83518

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 50602

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5536

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1007764

Other (OTH) AF: 0.0000177 AC: 1 AN: 56422

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.85
CADD	Benign	1.0
DANN	Benign	0.45
PhyloP100		-0.072

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

Other links and lift over

dbSNP: rs2235035; hg19: chr7-87179086;