Genetic Variant COL27A1:p.Arg7Pro (chr9-114155970-G-C) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_032888.4(COL27A1):c.20G>C(p.Arg7Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000088 in 1,136,686 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/22 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. R7L) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 31)

Exomes 𝑓: 8.8e-7 ( 0 hom. )

Consequence

COL27A1
NM_032888.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -0.101

Publications

0 publications found

Variant links:

Genes affected

COL27A1 (HGNC:22986): (collagen type XXVII alpha 1 chain) This gene encodes a member of the fibrillar collagen family, and plays a role during the calcification of cartilage and the transition of cartilage to bone. The encoded protein product is a preproprotein. It includes an N-terminal signal peptide, which is followed by an N-terminal propetide, mature peptide and a C-terminal propeptide. The N-terminal propeptide contains thrombospondin N-terminal-like and laminin G-like domains. The mature peptide is a major triple-helical region. The C-terminal propeptide, also known as COLFI domain, plays crucial roles in tissue growth and repair. Mutations in this gene cause Steel syndrome. Alternatively spliced transcript variants have been found, but the full-length nature of some variants has not been determined. [provided by RefSeq, Sep 2014]

COL27A1 Gene-Disease associations (from GenCC):

Steel syndrome
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, G2P, Labcorp Genetics (formerly Invitae)

COL27A1 links:

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ACMG classification

Classification was made for transcript

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=0.204867).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL27A1	NM_032888.4 link	c.20G>C	p.Arg7Pro	missense_variant	Exon 1 of 61	ENST00000356083.8	NP_116277.2	Q8IZC6-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COL27A1	ENST00000356083.8 link	c.20G>C	p.Arg7Pro	missense_variant	Exon 1 of 61	1	NM_032888.4	ENSP00000348385.3		Q8IZC6-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

8.80e-7

AC:

AN:

1136686

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

544006

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

24506

American (AMR)

AF:

0.00

AC:

AN:

16264

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

14934

East Asian (EAS)

AF:

0.00

AC:

AN:

30202

South Asian (SAS)

AF:

0.00

AC:

AN:

26014

European-Finnish (FIN)

AF:

0.00

AC:

AN:

27814

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4406

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

947040

Other (OTH)

AF:

0.0000220

AC:

AN:

45506

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.24

BayesDel_addAF

Benign

-0.012

BayesDel_noAF

Benign

-0.26

CADD

Benign

(source)

DANN

Benign

0.97

DEOGEN2

Benign

0.0011

Eigen

Benign

-0.71

Eigen_PC

Benign

-0.68

FATHMM_MKL

Benign

0.29

LIST_S2

Benign

0.47

M_CAP

Pathogenic

0.96

MetaRNN

Benign

0.20

MetaSVM

Benign

-0.55

MutationAssessor

Benign

0.49

PhyloP100

-0.10

PrimateAI

Pathogenic

0.84

PROVEAN

Benign

-0.24

REVEL

Uncertain

0.29

Sift

Pathogenic

0.0

Sift4G

Uncertain

0.012

Polyphen

0.0

Vest4

0.27

MutPred

0.28

Loss of MoRF binding (P = 0);

MVP

0.082

MPC

0.16

ClinPred

0.41

GERP RS

-4.1

PromoterAI

0.069

Neutral

(source)

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.3

Varity_R

0.22

gMVP

0.46

Mutation Taster

=86/14

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over