NM_000785.4:c.1166G>A

Variant names:

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PM2PP3_ModeratePP5_Very_Strong

The NM_000785.4(CYP27B1):c.1166G>A(p.Arg389His) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000115 in 1,613,992 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 Likely pathogenic (★★).

Frequency

Genomes: 𝑓 0.000046 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00012 ( 0 hom. )

Consequence

CYP27B1
NM_000785.4 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:6

Conservation

PhyloP100: 7.48

Variant links:

Genes affected

CYP27B1 (HGNC:2606): (cytochrome P450 family 27 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. The protein encoded by this gene localizes to the inner mitochondrial membrane where it hydroxylates 25-hydroxyvitamin D3 at the 1alpha position. This reaction synthesizes 1alpha,25-dihydroxyvitamin D3, the active form of vitamin D3, which binds to the vitamin D receptor and regulates calcium metabolism. Thus this enzyme regulates the level of biologically active vitamin D and plays an important role in calcium homeostasis. Mutations in this gene can result in vitamin D-dependent rickets type I. [provided by RefSeq, Jul 2008]

CYP27B1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 12 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.874

PP5

Variant 12-57764147-C-T is Pathogenic according to our data. Variant chr12-57764147-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1669.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr12-57764147-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CYP27B1	NM_000785.4 link	c.1166G>A	p.Arg389His	missense_variant	Exon 7 of 9	ENST00000228606.9	NP_000776.1	O15528

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
CYP27B1	ENST00000228606.9 link	c.1166G>A	p.Arg389His	missense_variant	Exon 7 of 9	1	NM_000785.4	ENSP00000228606.4	O15528
CYP27B1	ENST00000546567 link	c.*171G>A		3_prime_UTR_variant	Exon 5 of 5	5		ENSP00000520828.1	F8VWR7
CYP27B1	ENST00000547344.5 link	n.1305G>A		non_coding_transcript_exon_variant	Exon 6 of 8	2

Frequencies

GnomAD3 genomes

AF:

0.0000460

AC:

AN:

152144

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000735

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000103

AC:

AN:

251484

Hom.:

AF XY:

0.000110

AC XY:

AN XY:

135914

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.0000992

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000220

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000122

AC:

179

AN:

1461730

Hom.:

Cov.:

AF XY:

0.000111

AC XY:

AN XY:

727190

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.0000765

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.0000187

Gnomad4 NFE exome

AF:

0.000156

Gnomad4 OTH exome

AF:

0.0000497

GnomAD4 genome

AF:

0.0000460

AC:

AN:

152262

Hom.:

Cov.:

AF XY:

0.0000403

AC XY:

AN XY:

74450

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000735

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000119

Hom.:

Bravo

AF:

0.0000604

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000519

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.000132

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.000178

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Pathogenic:3

Aug 03, 2023

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Functional studies demonstrate that the R389H variant has no detectable 1-alpha-hydroxylase activity (Wang et al., 1998); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 17488797, 22190362, 23483640, 22443290, 24308945, 9837822, 12050193, 18394115, 11737215, 21700898, 31589614) -

Oct 19, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces arginine, which is basic and polar, with histidine, which is basic and polar, at codon 389 of the CYP27B1 protein (p.Arg389His). This variant is present in population databases (rs118204009, gnomAD 0.02%). This missense change has been observed in individual(s) with autosomal recessive vitamin D-dependent rickets, type I (VDDR1A) (PMID: 9837822, 12050193, 17488797, 18394115, 22443290). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 1669). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed for this missense variant. However, the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on CYP27B1 protein function. Experimental studies have shown that this missense change affects CYP27B1 function (PMID: 9837822). For these reasons, this variant has been classified as Pathogenic. -

Mar 04, 2025

Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Vitamin D-dependent rickets, type 1A

Pathogenic:2

Sep 18, 2024

Institute of Human Genetics, University of Leipzig Medical Center

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Criteria applied: PM3_VSTR, PM5_STR, PS3_SUP, PM2_SUP, PP3, PP4; Identified as compund heterozygous with NM_000785.4:c.1427T>C -

Mar 01, 2013

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Vitamin D-dependent rickets, type 1

Pathogenic:1

Apr 28, 2017

Illumina Laboratory Services, Illumina

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The CYP27B1 c.1166G>A (p.Arg389His) missense variant has been reported in at least four studies in which it is found in a compound heterozygous state in five patients with vitamin D-dependent rickets (Wang et al. 1998; Wang et al. 2002; Yan et al. 2011; Durmaz et al. 2012). Control data are unavailable for this variant, which is reported at a frequency of 0.00024 in the European (non-Finnish) population of the Exome Aggregation Consortium. Functional studies in mouse testicular Leydig MA-10 cells revealed the variant resulted in no detectable 1-Î±-hydroxylase activity (Wang et al. 1998). Three other variants resulting in the abolition of enzyme activity are also found at the Arg389 residue (Sawada et al. 2001). Based on the evidence, the p.Arg389His variant is classified as likely pathogenic for vitamin D-dependent rickets. This variant was observed by ICSL as part of a predisposition screen in an ostensibly healthy population. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.66

BayesDel_addAF

Pathogenic

0.22

BayesDel_noAF

Pathogenic

0.37

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.72

D;.

Eigen

Uncertain

0.64

Eigen_PC

Uncertain

0.63

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.87

D;D

M_CAP

Uncertain

0.28

MetaRNN

Pathogenic

0.87

D;D

MetaSVM

Uncertain

0.18

MutationAssessor

Pathogenic

3.3

M;.

PrimateAI

Uncertain

0.51

PROVEAN

Pathogenic

-4.9

D;D

REVEL

Pathogenic

0.83

Sift

Uncertain

0.0010

D;D

Sift4G

Pathogenic

0.0

D;D

Polyphen

1.0

D;.

Vest4

0.99

MVP

0.92

MPC

1.5

ClinPred

0.97

GERP RS

4.7

Varity_R

0.85

gMVP

0.89

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over