8-64798511-G-C

Position:

• chr8-64798511-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_004820.5(CYP7B1):​c.77C>G​(p.Ala26Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000221 in 1,355,192 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict 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: 33)
  • Exomes 𝑓: 0.0000022 (0 hom.)
• Consequence: CYP7B1 NM_004820.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.263

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 Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.20860854).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CYP7B1	NM_004820.5	c.77C>G	p.Ala26Gly	missense_variant	1/6	ENST00000310193.4	NP_004811.1
CYP7B1	NM_001324112.2	c.77C>G	p.Ala26Gly	missense_variant	1/7		NP_001311041.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CYP7B1	ENST00000310193.4	c.77C>G	p.Ala26Gly	missense_variant	1/6	1	NM_004820.5	ENSP00000310721.3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000221 AC: 3 AN: 1355192 Hom.: 0 Cov.: 32 AF XY: 0.00000150 AC XY: 1 AN XY: 668690

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000262

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.0000177

GnomAD4 genome Cov.: 33

Asia WGS AF: 0.000578 AC: 2 AN: 3472

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.13	T
BayesDel_noAF	Benign	-0.42
CADD	Benign	13
DANN	Uncertain	0.99
DEOGEN2	Benign	0.26	T
Eigen	Benign	-0.86
Eigen_PC	Benign	-0.93
FATHMM_MKL	Benign	0.073	N
LIST_S2	Benign	0.44	T
M_CAP	Uncertain	0.23	D
MetaRNN	Benign	0.21	T
MetaSVM	Benign	-0.82	T
MutationAssessor	Benign	0.0	N
PrimateAI	Uncertain	0.54	T
PROVEAN	Benign	-1.0	N
REVEL	Benign	0.27
Sift	Benign	0.11	T
Sift4G	Benign	0.25	T
Polyphen		0.65	P
Vest4		0.30
MutPred		0.44		Loss of stability (P = 0.0781);
MVP		0.67
MPC		0.23
ClinPred		0.17	T
GERP RS		1.0
Varity_R		0.071
gMVP		0.41

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

Publications

LitVar

Other links and lift over

dbSNP: rs754214163; hg19: chr8-65711068;