X-21856280-C-T

Variant names:

• chrX-21856280-C-T
• rs1056169851
• NM_206923.4:c.-205C>T

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BP4_Strong

The NM_206923.4(YY2):​c.-205C>T variant causes a 5 prime UTR premature start codon gain change involving the alteration of a non-conserved nucleotide. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 17)
  • Exomes 𝑓: 0.0000094 (0 hom. 1 hem.)
• Consequence: YY2 NM_206923.4 5_prime_UTR_premature_start_codon_gain
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.227
• Publications: 0 publications found

Genes affected

YY2 (HGNC:31684): (YY2 transcription factor) The protein encoded by this gene is a transcription factor that includes several Kruppel-like zinc fingers in its C-terminal region. It possesses both activation and repression domains, and it can therefore have both positive and negative effects on the transcription of target genes. This gene has an intronless coding region, and it appears to have arisen by retrotransposition of the related YY1 transcription factor gene, which is located on chromosome 14. [provided by RefSeq, May 2010]

MBTPS2 (HGNC:15455): (membrane bound transcription factor peptidase, site 2) This gene encodes a intramembrane zinc metalloprotease, which is essential in development. This protease functions in the signal protein activation involved in sterol control of transcription and the ER stress response. Mutations in this gene have been associated with ichthyosis follicularis with atrichia and photophobia (IFAP syndrome); IFAP syndrome has been quantitatively linked to a reduction in cholesterol homeostasis and ER stress response.[provided by RefSeq, Aug 2009]

MBTPS2 Gene-Disease associations (from GenCC):

• IFAP syndrome 1, with or without BRESHECK syndrome

  Inheritance: XL, AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, Orphanet, Ambry Genetics
• keratosis follicularis spinulosa decalvans

  Inheritance: XL, AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: G2P, Orphanet
• Olmsted syndrome, X-linked

  Inheritance: XL Classification: STRONG, LIMITED Submitted by: G2P, Ambry Genetics
• osteogenesis imperfecta, type 19

  Inheritance: XL Classification: STRONG, LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• mutilating palmoplantar keratoderma with periorificial keratotic plaques

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• osteogenesis imperfecta

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• BRESEK syndrome

  Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet
• keratosis follicularis spinulosa decalvans, X-linked

  Inheritance: XL Classification: LIMITED Submitted by: Ambry Genetics

ENSG00000308122 (HGNC:):

ACMG classification

Our verdict: Likely_benign. The variant received -4 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.75).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_206923.4. 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
	YY2	NM_206923.4	MANE Select	c.-205C>T		5_prime_UTR_premature_start_codon_gain	Exon 1 of 1	NP_996806.2	O15391
	YY2	NM_206923.4	MANE Select	c.-205C>T		5_prime_UTR	Exon 1 of 1	NP_996806.2	O15391
	MBTPS2	NM_015884.4	MANE Select	c.670+2777C>T		intron	N/A	NP_056968.1	O43462

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	YY2	ENST00000429584.3	TSL:6 MANE Select	c.-205C>T		5_prime_UTR_premature_start_codon_gain	Exon 1 of 1	ENSP00000389381.2	O15391
	YY2	ENST00000429584.3	TSL:6 MANE Select	c.-205C>T		5_prime_UTR	Exon 1 of 1	ENSP00000389381.2	O15391
	MBTPS2	ENST00000379484.10	TSL:1 MANE Select	c.670+2777C>T		intron	N/A	ENSP00000368798.5	O43462

Frequencies

GnomAD3 genomes Cov.: 17

GnomAD4 exome AF: 0.00000943 AC: 2 AN: 212092 Hom.: 0 Cov.: 3 AF XY: 0.0000136 AC XY: 1 AN XY: 73690

⚠️ 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: 4040

American (AMR) AF: 0.00 AC: 0 AN: 7242

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 6006

East Asian (EAS) AF: 0.00 AC: 0 AN: 11380

South Asian (SAS) AF: 0.0000544 AC: 1 AN: 18391

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 13951

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 864

European-Non Finnish (NFE) AF: 0.00000721 AC: 1 AN: 138610

Other (OTH) AF: 0.00 AC: 0 AN: 11608

⚠️ 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.: 17

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000227

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.75
CADD	Benign	2.1
DANN	Benign	0.89
PhyloP100		-0.23
PromoterAI		0.10	Neutral

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs1056169851; hg19: chrX-21874398;