chr8-64615168-C-CA

Position:

• chr8-64615168-C-CA

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_004820.5(CYP7B1):​c.914_915insT​(p.Met305IlefsTer16) variant causes a frameshift change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CYP7B1 NM_004820.5 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 3.93

Genes affected

CYP7B1 (HGNC:2652): (cytochrome P450 family 7 subfamily B member 1) This gene encodes a member of the cytochrome P450 superfamily of enzymes. The cytochrome P450 proteins are monooxygenases which catalyze many reactions involved in drug metabolism and synthesis of cholesterol, steroids and other lipids. This endoplasmic reticulum membrane protein catalyzes the first reaction in the cholesterol catabolic pathway of extrahepatic tissues, which converts cholesterol to bile acids. This enzyme likely plays a minor role in total bile acid synthesis, but may also be involved in the development of atherosclerosis, neurosteroid metabolism and sex hormone synthesis. Mutations in this gene have been associated with hereditary spastic paraplegia (SPG5 or HSP), an autosomal recessive disorder. [provided by RefSeq, Apr 2016]

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 8-64615168-C-CA is Pathogenic according to our data. Variant chr8-64615168-C-CA is described in ClinVar as [Pathogenic]. Clinvar id is 424649.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CYP7B1	NM_004820.5	c.914_915insT	p.Met305IlefsTer16	frameshift_variant	4/6	ENST00000310193.4	NP_004811.1
CYP7B1	NM_001324112.2	c.914_915insT	p.Met305IlefsTer16	frameshift_variant	4/7		NP_001311041.1
CYP7B1	XM_017014002.2	c.980_981insT	p.Met327IlefsTer16	frameshift_variant	5/7		XP_016869491.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CYP7B1	ENST00000310193.4	c.914_915insT	p.Met305IlefsTer16	frameshift_variant	4/6	1	NM_004820.5	ENSP00000310721	P1
CYP7B1	ENST00000523954.1	n.188_189insT		non_coding_transcript_exon_variant	2/5	3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary spastic paraplegia Pathogenic:1

Pathogenic, criteria provided, single submitter

research

Unit for Genetic & Epidemiological Research on Neurological Disorders, Instituto de Investigação e Inovação em Saúde

Mar 07, 2017

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Computational scores

Source: dbNSFP v4.3

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

Publications

LitVar

Other links and lift over

dbSNP: rs1554524697; hg19: chr8-65527725;