rs770285398

Variant names:

• chr8-64616216-ATTGT-A
• rs770285398
• NM_004820.5:c.321_324delACAA

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_004820.5(CYP7B1):​c.321_324delACAA​(p.Lys107AsnfsTer2) variant causes a frameshift change. The variant allele was found at a frequency of 0.0000174 in 1,610,736 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: 𝑓 0.000026 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000016 (0 hom.)
• Consequence: CYP7B1 NM_004820.5 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:6
• Conservation: PhyloP100: 6.38
• Publications: 0 publications found

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]

CYP7B1 Gene-Disease associations (from GenCC):

• congenital bile acid synthesis defect 3

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), Orphanet
• hereditary spastic paraplegia 5A

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, Genomics England PanelApp

ACMG classification

Our verdict: Pathogenic. The variant received 18 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 8-64616216-ATTGT-A is Pathogenic according to our data. Variant chr8-64616216-ATTGT-A is described in ClinVar as Pathogenic. ClinVar VariationId is 240073.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004820.5. 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
	CYP7B1	NM_004820.5	MANE Select	c.321_324delACAA	p.Lys107AsnfsTer2	frameshift	Exon 3 of 6	NP_004811.1
	CYP7B1	NM_001324112.2		c.321_324delACAA	p.Lys107AsnfsTer2	frameshift	Exon 3 of 7	NP_001311041.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CYP7B1	ENST00000310193.4	TSL:1 MANE Select	c.321_324delACAA	p.Lys107AsnfsTer2	frameshift	Exon 3 of 6	ENSP00000310721.3
	CYP7B1	ENST00000864436.1		c.474_477delACAA	p.Lys158AsnfsTer2	frameshift	Exon 5 of 8	ENSP00000534495.1
	CYP7B1	ENST00000864435.1		c.321_324delACAA	p.Lys107AsnfsTer2	frameshift	Exon 4 of 7	ENSP00000534494.1

Frequencies

GnomAD3 genomes AF: 0.0000263 AC: 4 AN: 152050 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: 0.0000944

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000441

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000283 AC: 7 AN: 246920 AF XY: 0.0000298

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 FIN exome AF: 0.000187

Gnomad NFE exome AF: 0.0000269

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000165 AC: 24 AN: 1458686 Hom.: 0 AF XY: 0.0000138 AC XY: 10 AN XY: 725656

African (AFR) AF: 0.00 AC: 0 AN: 33260

American (AMR) AF: 0.00 AC: 0 AN: 44312

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26014

East Asian (EAS) AF: 0.00 AC: 0 AN: 39632

South Asian (SAS) AF: 0.00 AC: 0 AN: 85788

European-Finnish (FIN) AF: 0.000113 AC: 6 AN: 53180

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5708

European-Non Finnish (NFE) AF: 0.0000162 AC: 18 AN: 1110596

Other (OTH) AF: 0.00 AC: 0 AN: 60196

GnomAD4 genome AF: 0.0000263 AC: 4 AN: 152050 Hom.: 0 Cov.: 32 AF XY: 0.0000404 AC XY: 3 AN XY: 74270

African (AFR) AF: 0.00 AC: 0 AN: 41406

American (AMR) AF: 0.00 AC: 0 AN: 15260

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3462

East Asian (EAS) AF: 0.00 AC: 0 AN: 5182

South Asian (SAS) AF: 0.00 AC: 0 AN: 4832

European-Finnish (FIN) AF: 0.0000944 AC: 1 AN: 10596

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

European-Non Finnish (NFE) AF: 0.0000441 AC: 3 AN: 67994

Other (OTH) AF: 0.00 AC: 0 AN: 2090

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

ClinVar submissions as Germline

Significance: Pathogenic

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
3	-	-	not provided (3)
1	-	-	Hereditary spastic paraplegia 5A;C3151147:Congenital bile acid synthesis defect 3 (1)
1	-	-	Inborn genetic diseases (1)
1	-	-	Spastic paraplegia (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		6.4
Mutation Taster		=3/197	disease causing (ClinVar)

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: rs770285398; hg19: chr8-65528773;