X-13755141-CTT-CT

Variant names:

• chrX-13755141-CT-C
• rs759385204
• NM_003611.3:c.1130-4delT

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_003611.3(OFD1):​c.1130-4delT variant causes a splice region, intron change. The variant allele was found at a frequency of 0.00000187 in 1,072,057 control chromosomes in the GnomAD database, with no homozygous occurrence. There are no hemizygote samples in GnomAD. 1/1 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 24)
  • Exomes 𝑓: 0.0000019 (0 hom. 0 hem.)
• Consequence: OFD1 NM_003611.3 splice_region, intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 4.67
• 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):

• Joubert syndrome 10

  Inheritance: XL Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
• OFD1-related ciliopathy

  Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen
• 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: Labcorp Genetics (formerly Invitae), G2P
• 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: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_003611.3. 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
	OFD1	NM_003611.3	MANE Select	c.1130-4delT		splice_region intron	N/A	NP_003602.1	O75665-1
	OFD1	NM_001440947.1		c.1130-4delT		splice_region intron	N/A	NP_001427876.1
	OFD1	NM_001330209.2		c.1010-4delT		splice_region intron	N/A	NP_001317138.1	O75665-3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	OFD1	ENST00000340096.11	TSL:1 MANE Select	c.1130-4delT		splice_region intron	N/A	ENSP00000344314.6	O75665-1
	OFD1	ENST00000380550.6	TSL:1	c.1010-4delT		splice_region intron	N/A	ENSP00000369923.3	O75665-3
	OFD1	ENST00000922714.1		c.1133-4delT		splice_region intron	N/A	ENSP00000592773.1

Frequencies

GnomAD3 genomes Cov.: 24

GnomAD4 exome AF: 0.00000187 AC: 2 AN: 1072057 Hom.: 0 Cov.: 26 AF XY: 0.00 AC XY: 0 AN XY: 341747

⚠️ 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: 25953

American (AMR) AF: 0.00 AC: 0 AN: 35169

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 19230

East Asian (EAS) AF: 0.00 AC: 0 AN: 30079

South Asian (SAS) AF: 0.00 AC: 0 AN: 53542

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 39701

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4077

European-Non Finnish (NFE) AF: 0.00000122 AC: 1 AN: 819017

Other (OTH) AF: 0.0000221 AC: 1 AN: 45289

⚠️ 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.: 24

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		4.7

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

Other links and lift over

dbSNP: rs759385204; hg19: chrX-13773260;