8-64798511-G-C

Variant names:

• chr8-64798511-G-C
• rs754214163
• NM_004820.5:c.77C>G

Variant summary

Our verdict is Uncertain significance. The variant received 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. 14/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A26V) has been classified as Uncertain significance.

• 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
• Publications: 2 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):

• CYP7B1-related disorder of oxysterol accumulation

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• congenital bile acid synthesis defect 3

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

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

ENSG00000287998 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

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

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.77C>G	p.Ala26Gly	missense	Exon 1 of 6	NP_004811.1	O75881
	CYP7B1	NM_001324112.2		c.77C>G	p.Ala26Gly	missense	Exon 1 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.77C>G	p.Ala26Gly	missense	Exon 1 of 6	ENSP00000310721.3	O75881
	CYP7B1	ENST00000864436.1		c.77C>G	p.Ala26Gly	missense	Exon 1 of 8	ENSP00000534495.1
	CYP7B1	ENST00000864435.1		c.77C>G	p.Ala26Gly	missense	Exon 2 of 7	ENSP00000534494.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00 AC: 0 AN: 101256 AF XY: 0.00

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: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

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

African (AFR) AF: 0.00 AC: 0 AN: 27694

American (AMR) AF: 0.00 AC: 0 AN: 32260

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 24216

East Asian (EAS) AF: 0.00 AC: 0 AN: 32002

South Asian (SAS) AF: 0.0000262 AC: 2 AN: 76294

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 33342

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4054

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1068892

Other (OTH) AF: 0.0000177 AC: 1 AN: 56438

GnomAD4 genome Cov.: 33

Asia WGS AF: 0.000578 AC: 2 AN: 3472

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

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
PhyloP100		0.26
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
PromoterAI		-0.076	Neutral
Varity_R		0.071
gMVP		0.41
Mutation Taster		=93/7	polymorphism

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: rs754214163; hg19: chr8-65711068;