chr9-114155989-G-A

Variant names:

• chr9-114155989-G-A
• NM_032888.4:c.39G>A

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 2P and 7B. PM2 BP4_Strong BP6_Moderate BP7

The NM_032888.4(COL27A1):​c.39G>A​(p.Ala13Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000094 in 1,064,286 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 9.4e-7 (0 hom.)
• Consequence: COL27A1 NM_032888.4 synonymous
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.00100
• Publications: 0 publications found

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: G2P, Orphanet, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Likely_benign. The variant received -5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.55).
• BP6: Variant 9-114155989-G-A is Benign according to our data. Variant chr9-114155989-G-A is described in ClinVar as Likely_benign. ClinVar VariationId is 2018033.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP7: Synonymous conserved (PhyloP=0.001 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_032888.4. 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
	COL27A1	NM_032888.4	MANE Select	c.39G>A	p.Ala13Ala	synonymous	Exon 1 of 61	NP_116277.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL27A1	ENST00000356083.8	TSL:1 MANE Select	c.39G>A	p.Ala13Ala	synonymous	Exon 1 of 61	ENSP00000348385.3	Q8IZC6-1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 9.40e-7 AC: 1 AN: 1064286 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 509302

African (AFR) AF: 0.00 AC: 0 AN: 22696

American (AMR) AF: 0.00 AC: 0 AN: 15134

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 13298

East Asian (EAS) AF: 0.00 AC: 0 AN: 27204

South Asian (SAS) AF: 0.0000403 AC: 1 AN: 24824

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 24420

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4276

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 890658

Other (OTH) AF: 0.00 AC: 0 AN: 41776

GnomAD4 genome Cov.: 31

ClinVar

ClinVar submissions as Germline

Significance: Likely benign

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	-	1	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.55
CADD	Benign	13
DANN	Benign	0.97
PhyloP100		0.0010
PromoterAI		-0.00060	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.3

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

hg19: chr9-116918269;