rs749448671

Variant names:

• chrX-13751317-TAA-T
• rs749448671
• NM_003611.3:c.1006_1007delAA

Your query was ambiguous. Multiple possible variants found:

• chrX-13751317-TAA-T
• chrX-13751317-TAA-TAAA

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PVS1 PM2

The NM_003611.3(OFD1):​c.1006_1007delAA​(p.Lys336GlufsTer3) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000183 in 1,090,574 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 1 hemizygotes in GnomAD. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 23)
  • Exomes 𝑓: 0.0000018 (0 hom. 1 hem.)
• Consequence: OFD1 NM_003611.3 frameshift
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.06
• Publications: 0 publications found

Genes affected

OFD1 (HGNC:2567): (OFD1 centriole and centriolar satellite protein) This gene is located on the X chromosome and encodes a centrosomal protein. A knockout mouse model has been used to study the effect of mutations in this gene. The mouse gene is also located on the X chromosome, however, unlike the human gene it is not subject to X inactivation. Mutations in this gene are associated with oral-facial-digital syndrome type I and Simpson-Golabi-Behmel syndrome type 2. Many pseudogenes have been identified; a single pseudogene is found on chromosome 5 while as many as fifteen have been found on the Y chromosome. [provided by RefSeq, Aug 2016]

OFD1 Gene-Disease associations (from GenCC):

• ciliopathy

  Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen
• Joubert syndrome 10

  Inheritance: XL Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
• orofaciodigital syndrome I

  Inheritance: XL Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, G2P, Labcorp Genetics (formerly Invitae)
• retinitis pigmentosa 23

  Inheritance: XL Classification: STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
• primary ciliary dyskinesia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• retinitis pigmentosa

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• orofaciodigital syndrome type 6

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• Simpson-Golabi-Behmel syndrome type 2

  Inheritance: XL Classification: LIMITED Submitted by: G2P

ACMG classification

Our verdict: Pathogenic. The variant received 10 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
OFD1	NM_003611.3	c.1006_1007delAA	p.Lys336GlufsTer3	frameshift_variant	Exon 10 of 23	ENST00000340096.11	NP_003602.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
OFD1	ENST00000340096.11	c.1006_1007delAA	p.Lys336GlufsTer3	frameshift_variant	Exon 10 of 23	1	NM_003611.3	ENSP00000344314.6

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD2 exomes AF: 0.00000548 AC: 1 AN: 182580 AF XY: 0.0000149

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: 0.0000122

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000183 AC: 2 AN: 1090574 Hom.: 0 AF XY: 0.00000281 AC XY: 1 AN XY: 356320

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 26218

American (AMR) AF: 0.00 AC: 0 AN: 35125

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 19316

East Asian (EAS) AF: 0.00 AC: 0 AN: 30151

South Asian (SAS) AF: 0.00 AC: 0 AN: 53706

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 40501

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4104

European-Non Finnish (NFE) AF: 0.00000239 AC: 2 AN: 835604

Other (OTH) AF: 0.00 AC: 0 AN: 45849

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 23

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		2.1
Mutation Taster		=131/69	disease causing (fs/PTC)

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: rs749448671; hg19: chrX-13769436;