chr8-64596755-A-T

Variant names:

• chr8-64596755-A-T
• rs267606758
• NM_004820.5:c.1408T>A

Variant summary

Our verdict is Likely pathogenic. The variant received 7 ACMG points: 7P and 0B. PM2 PP3_Strong PP5

The NM_004820.5(CYP7B1):​c.1408T>A​(p.Phe470Ile) variant causes a missense change. The variant allele was found at a frequency of 0.00000274 in 1,461,664 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. F470S) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: CYP7B1 NM_004820.5 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 5.24
• Publications: 3 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: Likely_pathogenic. The variant received 7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.967
• PP5: Variant 8-64596755-A-T is Pathogenic according to our data. Variant chr8-64596755-A-T is described in ClinVar as Pathogenic. ClinVar VariationId is 6106.Status of the report is no_assertion_criteria_provided, 0 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.1408T>A	p.Phe470Ile	missense	Exon 6 of 6	NP_004811.1
	CYP7B1	NM_001324112.2		c.1234-6911T>A		intron	N/A	NP_001311041.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CYP7B1	ENST00000310193.4	TSL:1 MANE Select	c.1408T>A	p.Phe470Ile	missense	Exon 6 of 6	ENSP00000310721.3
	CYP7B1	ENST00000864436.1		c.1561T>A	p.Phe521Ile	missense	Exon 8 of 8	ENSP00000534495.1
	CYP7B1	ENST00000864435.1		c.1408T>A	p.Phe470Ile	missense	Exon 7 of 7	ENSP00000534494.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461664 Hom.: 0 Cov.: 31 AF XY: 0.00000413 AC XY: 3 AN XY: 727116

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44718

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26128

East Asian (EAS) AF: 0.00 AC: 0 AN: 39676

South Asian (SAS) AF: 0.00 AC: 0 AN: 86218

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53412

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5764

European-Non Finnish (NFE) AF: 0.00000360 AC: 4 AN: 1111886

Other (OTH) AF: 0.00 AC: 0 AN: 60382

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions as Germline

Significance: Pathogenic

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
1	-	-	Hereditary spastic paraplegia 5A (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.26
BayesDel_addAF	Pathogenic	0.35	D
BayesDel_noAF	Pathogenic	0.27
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.73	D
Eigen	Pathogenic	0.70
Eigen_PC	Uncertain	0.58
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Benign	0.69	T
M_CAP	Uncertain	0.15	D
MetaRNN	Pathogenic	0.97	D
MetaSVM	Uncertain	0.78	D
MutationAssessor	Pathogenic	3.0	M
PhyloP100		5.2
PrimateAI	Benign	0.45	T
PROVEAN	Uncertain	-4.0	D
REVEL	Pathogenic	0.69
Sift	Uncertain	0.015	D
Sift4G	Uncertain	0.028	D
Polyphen		0.99	D
Vest4		0.90
MutPred		0.80		Loss of catalytic residue at F470 (P = 0.2615)
MVP		0.95
MPC		0.47
ClinPred		0.99	D
GERP RS		4.4
Varity_R		0.27
gMVP		0.91
Mutation Taster		=30/70	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: rs267606758; hg19: chr8-65509312;